Practical trainings, student assistants and theses

Experimental investigation of the multiphase flow in a stirred tank with PIV and Shadowgraphy (Id 277)

School practical training

Foto: Motivation_StirredTank ©Copyright: Anna-Elisabeth Sommer, Flotation cell: https://www.matsamining.com/innovacion/planta-de-tratamiento/With the energy turnaround, the demand for rare earth elements (REE) for key technologies such as lithium for electromobility or neodymium for wind turbines is increasing. The effective processing and separation of these valuable minerals represent a challenge for the mineral industry. One possibility for separation is flotation. Flotation separates the solid particles based on their surface wettability. Hydrophobic valuable particles adhere to gas bubbles and rise as agglomerates. These form a froth which can be skimmed off. The selective separation is influenced by the hydrodynamics in the flotation cell. The optimization of existing flotation cells or the development of new ones has a great potential for more effective separation of REE. Of particular interest are numerical models of flotation cells. In these models, process parameters can be changed much more versatile and easier than in experimental investigations. For this purpose, however, it is necessary to understand the processes taking place in flotation based on experimental studies and also to generate data for the validation of numerical models. In this work, a comprehensive experimental study of multiphase flow in the stirred tank with Particle Image Velocimetry (PIV) and shadowgraphy, concerning flow conditions and material parameters, is to be carried out. The results will help to improve the understanding of multiphase flow within the stirred tank and provide validation data for numerical models.

FOCUS OF WORK
• Investigation of the influence of solid particles and bubbles on the multiphase flow in the stirred tank with PIV and shadowgraphy
• Development of suitable algorithms for data evaluation with MatLab or Python
• Cooperation with CFD department for comparison of experimental and numerical results

Department: Transport processes at interfaces

Contact: Sommer, Anna-Elisabeth

Requirements

• Studies in process/energy/mechanical engineering
• Interest in practical work
• Experience in programming with MatLab or Python is beneficial
• Good written and oral communication skills in English and German

Conditions

• Start: immediately
• Duration: ca. 6 months

Online application

Please apply online: english / german

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Application of baseline multiphase models to a new pipe flow data set (Id 276)

Student practical training / Bachelor theses / Master theses

Background:
For the CFD modelling of bubbly flows at the component-scale the two-fluid methodology has proven to be the most effective approach. For the various interfacial forces, turbulence sources and bubble coalescence and breakup processes a multitude of partly empirical closure models exist in the literature, each validated with the data from a particular experiment and a different flow configuration. The aim at the HZDR is to establish a single set of closure models that reflects local flow phenomena independent of the case investigated [1]. This set of baseline models should give the overall best agreement with the vast amount of data from various applications such as pipe flows, bubble columns or airlift reactors. The current set of baseline models has been established from the analysis of numerous cases that have already been added to an extensive case repository.
This set of baseline models should now be tested with a new TOPFLOW data set, which was recently produced at the HZDR [2]. The new experimental data includes measured liquid velocities and bubble sizes for the flow in a constricted vertical pipe. The goal of the project is to reproduce those new cases with the CFD-software OpenFOAM and to add them to our baseline repository.

Main tasks:
• Setting up a new TOPFLOW case in OpenFOAM
• Analysis of initial and boundary conditions
• Comparison of computed results with measured TOPFLOW data
• Use of the established setup on multiple TOPFLOW cases
• Adding the TOPFLOW cases to the baseline case repository
• Report and presentation of results

References:
[1] R. Rzehak et al., "Unified modeling of bubbly flows in pipes, bubble columns, and airlift columns," Chem. Eng. Sci. 157, pp. 147-158, 2017.
[2] M. Neumann-Kipping et al., "Investigations on bubbly two-phase flow in a constricted vertical pipe," Int. J. Multiph. Flow 2020 (submitted).

Department: Computational Fluid Dynamics

Requirements

• Experience using CFD software, preferably OpenFOAM
• Excellent written and verbal communication skills in English
• Team player (m/f/d) with a strong interest in multiphase flows

Conditions

Duration:
6 months

Links:

Online application

Please apply online: english / german

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Development and validation of a measurement and calibration program for a LIBS Handheld Analyzer device for the qualitative and quantitative analysis of scrap samples (Id 275)

Bachelor theses

Laser-induced breakdown spectroscopy (LIBS) is a very effective tool for the inspection of scrap samples, allowing rapid in-situ analysis of the composition both in the laboratory and directly in the recycling process. LIBS can detect low atomic number elements (i.e. light elements), some of which, such as carbon, are critical for the accurate characterization of individual scrap. However, it is also possible to detect harmful elements such as fluorine or bromine and thus remove critical samples from the recycling process.
The LIBS technology is available as a handheld instrument and thus offers the possibility to perform cost-effective analyses in real time on site.
The use of a 'LIBS Handheld Analyzer' always requires the application of a device-specific measurement and calibration program.
The aim of the bachelor thesis is the development and validation of such a program for the qualitative and quantitative analysis of simple alloys, which can be used as a blueprint for the development of further analysis programs for more complex composite scrap.

Department: Analytics

Contact: Dr. Renno, Axel, Dr. Möckel, Robert, Ebert, Doreen

Requirements

The thesis is suitable for students (m/f/d) of chemistry and materials science who are interested in analysis and who have a high degree of independence and are committed to an exact working method

Conditions

Start possible at any time
Duration according to the respective study regulations

Online application

Please apply online: english / german

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Student assistant for technology marketing wanted (Id 274)

Student Assistant

Your tasks:
• Support in event management
• Technology marketing support
• Communication and interaction with alumni
• Technical research e.g. in the field of alumni management, CRM systems
• Database creation and maintenance
• Other administrative activities

Department: Technology Transfer & Innovation

Contact: Dr. Wolf, Björn

Requirements

• a bachelor's degree in a communication, economics or humanities course
• Pronounced service orientation
• Expert handling of MS Office and social media
• Ideally experience with content management systems and databases
• Excellent verbal and written communication skills
• Independent and structured way of working
• Teamwork
• Fluent knowledge of English

It is up to you to write, research and conceptualize. You are creative and like to bring in new ideas. Reliability, independence and structured work characterize your personality. You can familiarize yourself quickly with new tasks and like to get involved in a motivated team. We look forward to meeting you!

Conditions

We offer you exciting and challenging tasks, a collegial and international working environment, active support in the implementation of your tasks, as well as room for decision and responsibility. Various topics for scientific work are available. The place of work is Dresden-Rossendorf. The duration of the SHK activity (min. 5 h / week) should be at least one year, the internship (full-time) should be at least 3 months.

Online application

Please apply online: english / german

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Student assistant/internship in technology transfer and innovation wanted (Id 273)

Student practical training / Student Assistant

Your tasks:
- Participation in the potential screening of research results
- Internet and database research for market and competition and patent analyzes
- Creation of utilization or business planning for spin-offs
- Creation of cost calculations and financial planning
- Creation of technology exposes
- Creation of presentations
- Database maintenance, reporting, evaluation of data on transfer key figures
- After individual consultation, independent processing of various projects (e.g. conception and support of reporting system & benchmarking etc.)

Department: Technology Transfer & Innovation

Contact: Dr. Wolf, Björn

Requirements

You have successfully completed at least the first academic year of industrial engineering, economics or a further degree (esp. MINT) with a partial business qualification. Your grade point average is min. 2.0. You have significant practical experience in the relevant areas and have good knowledge of MS Office. You work independently, in a structured manner, can quickly familiarize yourself with new tasks and are happy to contribute to a motivated team. You have very good knowledge of English.

Conditions

We offer you exciting and challenging tasks, a collegial and international working environment, active support in the implementation of your tasks, as well as room for decision and responsibility. Various topics for scientific work are available. The place of work is Dresden-Rossendorf. Some of the tasks can be completed after coordination in home work. The duration of the SHK activity (min. 5 h / week) should be at least one year, the internship (full-time) should be at least 3 months.

Online application

Please apply online: english / german

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Design, construction and commissioning of a test rig for the experimental investigation of valve trays for distillation columns (Id 269)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship

Foto: Eye-Catcher Tray Column ©Copyright: Vineet VishwakarmaDistillation columns are used for thermal separation of multicomponent mixtures in the chemical industry. Owing to increased energy supply from renewable sources a more flexible operation of such apparatuses is already demanded. However, enlarged over- and underload modes are challenging with respect to design, since a high separation efficiency needs to be attained anyway. Especially in case of valve trays there are presently no reliable methods for estimating the influence of the tray design on the complex two-phase flow of liquid and vapor.
Within the frame of a current research project that aims at closing this gap, we offer a student internship position for establishing a lab-scale test rig, which allows for investigating the two-phase flow at single valves in detail. The work includes typical engineering tasks, such as conception, design, assembly and commissioning.

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Wiedemann, Philipp

Requirements

• studies in process/energy/mechanical engineering
• interest in practical work
• creativity
• good written and oral communication skills in English and German

Conditions

• start: from Feb. 2020
• working in a multi-disciplinary team
• remuneration according to HZDR internal regulations

Online application

Please apply online: english / german

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Experimentelle Untersuchung des Stofftransportes in Blasenströmungen (Id 268)

Master theses / Diploma theses / Compulsory internship

Foto: Visulalsierung des Produktes der Reaktion von Fe(EDTA) und NO ©Copyright: Ragna KippingBlasensäulen sind ein beliebter Reaktortyp für die Durchführung von gas-flüssig Reaktionen in der chemischen Industrie. Sie zeichnen sich durch hohe Stofftransportraten und eine gute Durchmischung aus. Die Auslegung dieser Apparate basiert jedoch meist auf groben Abschätzungen, da die in Blasensäulen ablaufenden Prozesse sehr komplex sind. Dieses Projekt befasst sich mit der Untersuchung des Stofftransportes an Einzelblasen und Blasengruppen. Die zu untersuchende Reaktion ist eine Modellreaktion und zeichnet sich durch die Bildung eines farbigen Reaktionsproduktes aus und kann spektroskopisch erfasst werden.

Die Aufgabenstellung umfasst:
- Literaturrecherche
- Durchführung der Stofftransportmessungen an einem bestehenden Versuchsaufbau im Chemielabor
- Auswertung der gewonnenen Messdaten vorzugsweise mit Matlab
- Dokumentation und Vergleich mit Literaturdaten

Department: Experimental Thermal Fluid Dynamics

Contact: Kipping, Ragna

Requirements

- Studium des Chemie-Ingenieurwesen, Verfahrenstechnik, o.ä.
- Freude am experimentellen Arbeiten
- Laborerfahrung wünschenswert
- Erfahrungen im Umgang mit Matlab von Vorteil

Conditions

Dauer: 4-6 Monate

Links:

Online application

Please apply online: english / german

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Nonlinear characterization of horizontal gas-liquid flows (Id 266)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship / Research Assistant

Foto: Nonlinear characterization of horizontal gas-liquid flows ©Copyright: Dr. Philipp WiedemannHorizontal gas-liquid flows occur in a variety of processes in energy and process engineering. According to the type of fluids, operating conditions and geometrical aspects different flow patterns are observed. These can be identified successfully by means of online monitoring systems when using appropriate measurement techniques and data processing algorithms.
Within the frame of an internship further investigations will focus on the predictability of the future development of the flow patterns on the basis of currently measured data. For that purpose, methods for characterizing nonlinear systems will be applied to available data that was recorded with the aid of an imaging technique.

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Wiedemann, Philipp

Requirements

- studies in mathematics/physics/engineering
- interest in applying sophisticated mathematical methods to engineering problems
- experience in signal processing and nonlinear systems is beneficial
- good written and oral communication skills in English and German

Conditions

- start: immediately
- working in a multi-disciplinary team
- remuneration according to HZDR internal regulations

Links:

Online application

Please apply online: english / german

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Experimental investigation of particle remobilisation from wall surfaces with well-defined asperities (Id 265)

Master theses / Diploma theses / Compulsory internship / Volunteer internship

As member of the Helmholtz Association of German Research Centers, the Helmholtz-Zentrum Dresden – Rossendorf (HZDR) employs about 1,200 people. The Center's focus is on interdisciplinary research in the areas energy, health, and matter.

The Institute of Fluid Dynamics of HZDR has a strong focus on the resuspension of micron particles in turbulent flows. It invites applications for a six-month internship to investigate experimentally the particle detachment from wall surfaces in turbulent flows. The position is available immediately. Kindly submit your completed application (including cover letter, CV, diplomas/transcripts, etc.) via our Online-application-system.

Advances in the generation of functional surfaces (i.e. surfaces with well-defined asperities) make it possible to design self-cleaning surfaces. The automotive industry may for instance benefit from such advances. The aim of the project is to study experimentally the detachment of “dust” particles (glass beads with diameters ranging from 10 to 50 µm) on smooth substrates with precisely defined asperities (size of the asperities about 1 µm). The collision of the rolling dust particles with the asperities is expected to boost the resuspension, thereby leading to an enhanced self-cleaning effect of such surfaces.

The tasks of the project will involve:
- Perform a literature survey on the resuspension of micron-particles in turbulent flows
- Design a small wind tunnel to study the particle detachment from wall surfaces with well-defined asperities
- Use of high-speed cameras to visualize the particle detachment in turbulent flows

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Lecrivain, Gregory

Requirements

Interest in fluid dynamics
Studies in natural sciences or engineering
Willingness to conduct experimental work

Conditions

Remuneration is normally offered to our trainees
German lessons are also available free of charge

Online application

Please apply online: english / german

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Energetische Bewertung der CO2-Abtrennung von Syngasturbinen mittels intensiverter Trennapparate (Id 263)

Master theses / Diploma theses

Um die von der europäischen Union anvisierten Klimaziele zu erreichen muss eine deutliche Reduktion der CO2-Emissionen erfolgen. Hierbei ist eine Abtrennung von CO2 bei nicht substituierbaren Quellen wie der Zement und Stahlindustrie notwendig. Weiterhin werden dezentrale Blockheizkraftwerke einen wesentlichen Beitrag zur Lastflexibilität leisten und somit die Versorgungsstabilität (Backbone) für den Fall gewährleisten, dass erneuerbare Energien temporär nicht verfügbar sind. Da mittelfristig ein Betrieb dieser Blockheizkraftwerke mit Erdgas und punktuelle CO2-Quellen nicht zu vermeiden sind, ist ein geeignetes Konzept zur effizienten CO2-Abtrennung erforderlich. Ein Ansatzpunkt ist die Kopplung von Gasturbine und HiGEE-Trennapparaten über einen gemeinsamen Rotor. HiGEE-Apparate bestehen aus rotierenden Packungen, in denen Waschmittel und Rauchgas unter Ausnutzung der Zentrifugalkraft kontaktiert werden.

Im Rahmen der Arbeit ist eine Recherche zu CO2-Punktquellen in Deutschland und Europa durchzuführen und die CO2-Emissionen sind quantitativ und qualitativ einzuordnen. Ein Konzept zur CO2-Abscheidung ist energetisch zu bewerten. Exemplarisch sollen Betriebsdaten (Leistung, Wirkungsgrad, Abgaszusammensetzung und -temperatur) eines Blockheizkraftwerkes angenommen werden. Daten zur CO2-Abtrennung mittels HiGEE-Apparate sind aus der Literatur zu extrahieren.

Folgende Teilarbeiten sind durchzuführen:

- Recherche zu CO2-Punktquellen in Deutschland und Europa
- Recherche/Analyse der Überschussstromproduktion in Deutschland anhand einer Beispielregion
- Ausstellen der Wärme- und Stoffbilanzen und möglicher energetischer Verschaltungen (Wärmerückgewinnung)
- Abschätzungen erforderlicher HiGEE-Apparategrößen
- Bestimmung des Turbinenwirkungsgrades unter Berücksichtigung des Desportionsprozesses

Department: Experimental Thermal Fluid Dynamics

Contact: Fogel, Stefan, Unger, Sebastian

Requirements

Student (m/w/d) im Bereich Energietechnik, Chemie- oder Elektroingenieurwesen, Verfahrenstechnik oder ähnlicher fachlicher Ausrichtung.
Kenntnisse in Aspen Plus, ChemCAD oder ähnlichen Programmen sowie gute Sprachkenntnisse in Englisch.

Conditions

Mindestdauer: 6 Monate; ab sofort durchführbar.

Online application

Please apply online: english / german

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Development of a GUI for a Python simulation tool (Id 261)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship / Volunteer internship

Foto: Lithium liquid metal electrode ©Copyright: ©Steffen Landgraf, Michael NimtzFor a software project (simulation tool in Python 3), a graphical user interface (based on Tkinter or Qt) shall to be developed. The goal is to configure, start and evaluate simulations via the GUI. Consequently, all interfaces must be developed or modified, the operator panel must be designed and all needed testing and error-handling routines must be implemented.

Note: This is an offer suitable for a bachelor, master or diploma thesis or studentic internships.
Do not apply if you already finished your studies!

Department: Magnetohydrodynamics

Contact: Dr. Nimtz, Michael

Requirements

Study informatics or similar.
Good knowledge of a programming language, preferably python as well as experience with the implementation of GUIs.
Basic knowledge of engineering principles is beneficial.
Good command of English.

Conditions

Start: from November 2019
Duration: 4-6 months
Paid according to HZDR-internal tariff

Links:

Online application

Please apply online: english / german

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Gas phase simulation of pressure wave in a gas-injection pipe (Id 259)

Student practical training / Bachelor theses / Master theses / Diploma theses

Foto: Bubble Formation ©Copyright: Ehsan Mohseni, Ehsan MohseniIn two-phase flows, the interface at which the phases are in contact to one another is of high importance. One way to manipulate the dynamic of this interface is to modulate the pressure field within the gas phase. Accordingly, it is intended to study the influence of pressure modulation in a gas pipe with multiple openings. In this content, the system characteristics should be defined and the effect of individual parameters, which influence the temporal change of the pressure field at the openings are going to be studied. These parameters include frequency and amplitude of excitations, pressure fluctuation, geometry of the pipe and the openings, gas flow rate, etc. To peruse this idea, it is intended to simulate the gas pressure field in the pipe and under the opening using COMSOL Multiphysics.

Task Spectrum:
• Establishment of a profound scientific knowledge in the field of acoustics and wave propagation
• Literature review on interacting two phase flows and pressure waves
• Establishing the simulation strategy
• Model the geometry, flow domain, establishing the initial and boundary condition
• Performing the simulation with various geometries and post processing the result
• Generate scientific documentation

Department: Experimental Thermal Fluid Dynamics

Contact: Mohseni, Ehsan, Dr. Reinecke, Sebastian

Requirements

• Studies in mechanical, chemical, process engineering, and similar engineering courses
• Experience in simulation with COMSOL Multiphysics
• Optionally but not necessarily experience with acoustic module of COMSOL Multiphysics
• Independence, self-responsible working methods

Conditions

Duration: 6 Months

Online application

Please apply online: english / german

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Modelling of bubble formation on submillimeter submerged orifice (Id 258)

Student practical training / Bachelor theses / Master theses / Diploma theses

Foto: Bubble Formation ©Copyright: Ehsan Mohseni, Ehsan MohseniBubbles are an inevitable part of almost all chemical and process engineering processes as long as heat and mass transfer or particle separation are concerned. Formation of bubbles from a submerged orifice is a typical fluid dynamic phenomenon, which incorporates the influence of different characteristics of both gas and liquid phases. Although posing as a simple problem in the first sight, the formation process varies dramatically by changing influential parameters such as diameter and geometry of orifice, volume of gas reservoir under the orifice, surface tension, density and viscosity of both continuous and dispersed phases, etc. Among these parameters, the effect of the volume of the gas reservoir under the orifice is highly influential. Within an ongoing investigation, we are experimentally studying the effect of this parameter on the dynamics of bubbles generated at orifices smaller than 1 mm. A sub task of this investigation associates the findings of the experimental studies into a mechanistic model, which is designed to estimate the final bubble size.

Task Spectrum:
• Establishment of a profound scientific knowledge into the phenomena of bubble formation and detachment
• Concept development and establishing solution strategy for the bubble volume
• Implementing the solutions into MATLAB
• Compare and adopting the model based on the experimental results
• Generate scientific documentation

Department: Experimental Thermal Fluid Dynamics

Contact: Mohseni, Ehsan, Dr. Reinecke, Sebastian

Requirements

• Studies in mechanical, chemical, process engineering, and similar engineering courses
• Experience in data analysis and programming with MATLAB
• Independence, self-responsible working methods

Conditions

Duration: 6 Months

Online application

Please apply online: english / german

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Design and operation of liquid metal batteries as large-scale storage option (Id 256)

Student practical training / Bachelor theses / Master theses / Diploma theses / Compulsory internship / Volunteer internship

Foto: Study of a liquid metal battery module ©Copyright: Dr. Michael Nimtz, ©Michael NimtzIn contrast to conventional batteries, Liquid Metal Batteries feature all liquid anodes (alkaline or alkaline earth metal), cathodes (transition metal or metal) and electrolytes (molten salts) at a temperature between 400 °C and 600 °C. For the operation of liquid metal batteries as large-scale storage option (frequency control and other applications), the design of the storage system and operation strategies (including a battery management system) need to be implemented and tested using exemplary load curves.
Starting point is an existing model of a battery system in Python.

Note: This is an offer suitable for a bachelor, master or diploma thesis or studentic internships.
Do not apply if you already finished your studies!

Department: Magnetohydrodynamics

Contact: Dr. Nimtz, Michael

Requirements

Study of mechanical engineering, physics, mathematics or similar
Basic knowledge of engineering principles.
Good knowledge of a programming language, preferably python.

Conditions

Start: October 2019
Duration: 4-6 months
Paid according to HZDR-internal tariff

Links:

Online application

Please apply online: english / german

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Investigation of the flow behavior of fluidized particles by means of coupled CFD-DEM simulations (Id 253)

Master theses / Diploma theses / Compulsory internship / Research Assistant

Foto: CFD-DEM fluidized bed ©Copyright: Dr. Philipp WiedemannFluidized beds are widely applied in process plants of pharmaceutical, food and chemical industries. Due to the complex flow structure optimization of such devices and process control is usually supported by simulations. However, since it is not feasible to resolve all spatial and temporal scales within a single simulation environment, large-scale simulations require reliable sub-models in order to account for small-scale phenomena correctly.
Therefore, the macroscopic flow properties of fluidized particles will be investigated by means of CFD-DEM simulations within the frame of an internship. Research will focus on the influence of different particle size distributions. The results shall lead to enhanced insight into the complex gas-solids-interaction of fluidized beds and will be incorporated into future developments.

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Wiedemann, Philipp

Requirements

• studies in chemical/mechanical/process/computational engineering
• interest in multiphase flow phenomena
• good written and oral communication skills in English and German
• knowledge in computational fluid dynamics

Conditions

• start: immediately
• scope of work: up to 6 months (according to study regulations)

Online application

Please apply online: english / german

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Student assistant at the DeltaX School Lab (Id 252)

Student Assistant / Research Assistant

Foto: Schulklasse im Schülerlabor DeltaX zum Versuchstag Chemie der Elemente (November 2018) ©Copyright: HZDRThe DeltaX student laboratory makes research at the Helmholtz-Zentrum Dresden-Rossendorf an experience for students. We are looking for tutors who enjoy teaching science, research and technology and who would like to support students conducting their experiments. Apply as a student assistant in the DeltaX school laboratory and become part of a young and open-minded team.

Department: Communication & Media Relations

Contact: Dr. Streller, Matthias, Gneist, Nadja

Requirements

- Study of a scientific subject
- Remaining study duration of at least 2 semesters
- Pleasure in teaching science and research- Good to very good grades
- Very good knowledge of German (C level)

Conditions

- 5 - 10 h / week on whole weekdays
- Start of hiring according to agreement

Links:

Online application

Please apply online: english / german

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Modbus/TCP-Kommunikation im TIA-Portal (Id 249)

Student practical training / Volunteer internship

Foto: Berthold-Monitor mit Siemens SPS ©Copyright: Nicole WagnerErstellung von SPS-Anwendersoftware.
Für die Kommunikation zwischen einer SPS und einem externen Messgerät sollen Softwarebausteine programmiert werden, die einen Verbindungsaufbau zum Gerät über eine Modbus/TCP-Verbindung realisieren und Daten abfragen und senden können.
Dafür ist die Implementierung des Übertragungsprotokolls sowie individueller Kommandos zu realisieren
(Programmierumgebung: SIEMENS TIA-Portal).

Institute: Department of Research Technology

Contact: Wagner, Nicole

Requirements

- Kenntnisse in SCL (Structured Control Language) oder C
- Grundkenntnisse Ethernet-Kommunikation

Conditions

- Bearbeitungszeit: ca. 4 Wochen
- Beginn: ab sofort

Online application

Please apply online: english / german

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Materialien für Solarkraftwerke (Id 241)

Bachelor theses / Master theses / Diploma theses

Foto: solarthermisches Turmkraftwerk ©Copyright: @AbengoaTurmkraftwerke stellen die neueste Generation von Anlagen zur solarthermischen Elektroenergieerzeugung dar. Extrem konzentriertes Sonnenlicht wird dabei auf einen zentralen Absorber gerichtet, der die Wärme auf eine Wärmeträgerflüssigkeit überträgt (s. Foto). Zur Erhöhung des Wirkungsgrades von Turmkraftwerken soll die Arbeitstemperatur von derzeit maximal 550°C deutlich erhöht werden. Dafür sollen werkstoffwissenschaftliche Lösungen weiter verfolgt werden, die im Rahmen eines EU-RISE-Projektes entwickelt wurden.

Als Themen für Graduierungsarbeit werden

i) die Optimierung von optischen und elektrischen Schichteigenschaften
ii) die Verbesserung der Schichthaftung auf Hochleistungslegierungen und
iii) die Komplettierung eines neuen Schichtsystems angeboten.

Zur Charakterisierung der untersuchten Materialien stehen modernste in situ und ex situ Analysemethoden zur Verfügung.

Department: Nanocomposite Materials

Contact: Dr. Krause, Matthias

Requirements

1. Studium der Werkstoffwissenschaften, Physik oder Chemie mit überdurchschnittlichen Leistungen (Notendurchschnitt ≤ 2.0)
2. Interesse und Freude an experimenteller wissenschaftlicher Arbeit
3. Grundkenntnisse in Programmierung und sicherer Umgang mit Büro- und wissenschaftlicher Software
4. Fachkundige Englischsprachkenntnisse

Conditions

Beginn: 1.10.2019, internationale Forschungsumgebung, ortsübliche Aufwandsentschädigung

Online application

Please apply online: english / german

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Entwicklung einer Handsteuerung für Kondensatorladegeräte (Id 216)

Student practical training

Foto: Display ©Copyright: Nick WinklerDie Handsteuerung eines Kondensatorladegerätes soll modernisiert werden. Das Kondensatorladegerät wird zur Untersuchung von Materialeigenschaften verwendet und erzeugt hohe Spannungen für das Laden von Kondensatoren.

Die Entwicklung der Handsteuerung beinhaltet unter anderem folgende Themen:
- Hardwareentwicklung (Schaltungsentwurf)
- Spezifikation/Recherche von Gehäuse-Optionen
- Softwareentwicklung (Mikrocontroller, Ansteuerung Display)
- Umfang ca. 4-6 Wochen als Praktikum

Institute: Department of Research Technology

Contact: Winkler, Nick, Dr. Herbrand, Frank

Requirements

- Grundkenntnisse Elektrotechnik
- Grundkenntnisse C

Online application

Please apply online: english / german

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Smart actuation system for flow following µAUV particles for industrial process environments (Id 175)

Master theses / Diploma theses / Compulsory internship

Foto: flow following sensor particle ©Copyright: Dr. Sebastian ReineckeSmart flow following sensor particles are used for acquisition of spatially distributed process parameters in industrial processes, such as biogas digesters, waste water treatment basins or bioreactors. The aim of the work is the development of an actuator concept for sensor µAUV-particles for the automatic adjustment of buoyancy (buoyancy) and for buoyancy maneuvers under the condition of small size, minimum energy consumption and high reliability. For this, alternative physical and chemical mechanisms should be considered based on the existing electromechanical solution. There are suitable variants to implement and test. Furthermore, the development of sensor intelligence for the actuators in the sensor particles is an essential part of the task. The developed concepts have to be validated experimentally.

We cordially invite you to an on-site conversation to introduce the topic and to agree on further details. Do not hesitate to contact us, because the way is worth it for you.

What can you expect:

In our department, we offer you an attractive work environment to expand your personal and professional skills. The insight into the diverse R&D projects of the department in the areas of sensor and measuring technology as well as energy and process engineering (among others) and the excellent technical equipment of the laboratories offer optimal conditions for this. The possibility of close contact with competent experienced colleagues plays a central role. As part of student work, we have pursued the approach of structured supervision and associated constructive feedback. This includes regular meetings with your supervisor and intermediate presentations in the form of informal "workshop reports" in the extended audience of interested individuals of the department in order to optimally support you in the successful completion of your project. Furthermore, we are open to support outstanding candidates in their continuing academic qualification, such as in doctoral scholarships or in current or upcoming R&D projects.

Subject-related task spectrum:

• Establishment of the scientific and technical principles of mechanical, physical and chemical principles of action for embedded, actuating components
• Concept development for actuators for taring of sensor particles
• Development of sensor intelligence for situation-dependent, automatic buoyancy, for buoyancy maneuvers and for recovery
• Selection, purchase/ composition and comparison of solution variants
• Minimization of size and energy consumption
• Increased reliability when used in particle-loaded biological substrates
• Development of firmware taking into account existing function routines based on an embedded system with 32-bit data structure (e.g. STM32)
• Conception and realization of suitable test scenarios
• Characterization and comparison of implemented variants with regard to accuracy of taring and reliability in long-term use

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Reinecke, Sebastian, Buntkiel, Lukas

Requirements

• Studies in electrical engineering, mechatronics, mechanical engineering and similar engineering courses
• Experience in design and (micro) actuator systems
• Experience in programming microcontrollers for embedded systems (e.g. STM32)
• Experience in control electronics for microdrives and board design for embedded systems
• Fundamentals of (micro) actuator systems, movement of rigid bodies, measurement uncertainties, digital signal processing
• Data analysis optionally in Matlab, Octave or C / C ++
• Independent, self-responsible working method

Links:

Online application

Please apply online: english / german

Druckversion


Entwicklung eines digitalen Lock-in-Verstärkers auf FPGA-Basis (Id 166)

Student practical training

Foto: Lock-in amplifier ©Copyright: Bert LangeDas Prinzip des Lock-In-Verstärkers erlaubt es empfindliche Messgeräte zu realisieren. Im vorliegenden Projekt soll die Umsetzung auf Basis digitaler Signalverarbeitung im FPGA erfolgen. Dabei sollen u. a. Erfahrungen bezüglich erreichbarer Performance und des nötigen Implementierungsaufwandes gewonnen werden.

Institute: Department of Research Technology

Contact: Lange, Bert

Requirements

- Studium der Elektrotechnik oder Informatik
- Interesse an digitaler Signalverarbeitung
- Grundkenntnisse im Einsatz von FPGAs
- Grundkenntnisse VHDL erforderlich

Online application

Please apply online: english / german

Druckversion


Bestimmung von Geschwindigkeitsfeldern aus tomographischen Bilddaten mittels Kreuzkorrelation (Id 164)

Bachelor theses / Master theses / Diploma theses

Foto: ROFEX CAD ©Copyright: Dr. Frank BarthelAm Institut für Fluiddynamik am Helmholtz-Zentrum Dresden-Rossendorf sind zahlreiche Messverfahren für die Untersuchung von Mehrphasenströmungen entwickelt worden. Eines davon ist die ultraschnelle Elektronenstrahl-Röntgen-Computertomographie, welche mit Aufnahmeraten von bis zu 8000 Bildern pro Sekunde eine dedizierte Aufklärung von Strömungsstrukturen erlaubt. Aufgrund der quasi simultanen Aufnahme von Bilddaten aus zwei Messebenen ergibt sich zudem die Möglichkeit, axiale Geschwindigkeiten zu bestimmen, wofür üblicherweise Kreuzkorrelationsverfahren verwendet werden. Im Rahmen dieser Arbeit sollen die Möglichkeiten dieser Methodik in Hinblick auf die Bestimmung von Geschwindigkeitsfeldern in verschiedenen Strömungsszenarienn analysiert werden.

Folgende Teilaufgaben sind zu lösen:
• Studie zu verschiedenen Varianten der Kreuzkorrelation
• Simulation verschiedener Szenarien und Bewertung der Genauigkeit
• Übertragung der Ergebnisse auf reale Messungen

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Bieberle, Martina

Requirements

• Studium der Informatik, Mathematik oder einer Ingenieurwissenschaft
• Interesse an Messverfahren und Datenanalyse
• Selbständiges Arbeiten

Conditions

Bearbeitungszeit 4 bis 6 Monate

Links:

Online application

Please apply online: english / german

Druckversion


Untersuchung des Einflusses von Regularisierungsmethoden auf Bildrekonstruktionsalgorithmen (Id 57)

Student practical training / Bachelor theses / Master theses / Diploma theses

Bei der tomographische Bildrekonstruktion muss ein diskretes inverses Problem gelöst werden, wofür algebraische Methoden wie zum Beispiel ART und CG-Verfahren verwendet werden können. Dabei spielt die Regularisierung, die den Einfluss von Diskretisierungsfehler und Messdatenrauschen auf die Lösung beschränkt, eine entscheidende Rolle. Deren Einfluss auf die Bildrekonstruktion von Röntgen- und Gamma-CT-Messdaten soll untersucht werden. Dazu sind folgende Teilaufgaben zu lösen:
• Implementierung verschiedener Regularisierungsmethoden
• Anwendung der Programme auf Messdaten
• Parameterstudien um die Regularisierungsmethoden für die Messdatensätze zu optimieren.

Department: Experimental Thermal Fluid Dynamics

Contact: Dr. Wagner, Michael, Dr. Bieberle, Martina

Requirements

• Programmierkenntnisse in MATLAB
• Grundkenntnisse zur numerischen Behandlung linearer Gleichungssysteme

Links:

Online application

Please apply online: english / german

Druckversion