Practical trainings, student assistants and theses

Numerical simulation of transport phenomena in Liquid Metal Batteries (Id 272)

Bachelor theses / Master theses / Diploma theses / Student Assistant / Compulsory internship / Volunteer internship

Foto: Liquid Metal Battery 2D ©Copyright: Paolo PersonnettazLiquid metal batteries (LMBs) are an innovative electrical energy storage techology proposed as a possible candidate for the grid integration of renewable energy sources (see https://youtu.be/Sddb0Khx0yA ).
Consisting of a totally liquid interior (two liquid metals are separated by a molten salt electrolyte), LMBs allow extremely high current densities. The raw materials are earth abundant and thecells can potentially be very cheap [1].
The high temperatures and the aggressive environment limit the experimental study to few measurable quantities. Numerical studies are required to understand the relevant transport phenomena and their effect on the cell performance [2].
Using the free and open source CFD library OpenFOAM a number of solvers were programmed in our group to predict fluid flow and transport phenomena in LMBs (i.e. [2, 3]).
In frame of a project work or a master thesis the student has the possibility to investigate heat and mass transfer in liquid metal batteries through numerical simulations. The task will encompass the entire CFD workflow from the preprocessing step to the evaluation of the results.
The work will be carried out in the Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany. This research center is a member of the Helmholtz Association of German Research Centers. The Center's focus is on interdisciplinary research in the areas energy, health and matter.
Please provide a letter of motivation, a CV as well as a transcript of records and a copy of your latest certificate (e.g. bachelor).
References:
[1] Kim et al., 2013. Liquid Metal Batteries: Past, Present, and Future. Chemical Reviews 113, 2075–2099. doi:10.1021/cr300205k
[2] Personnettaz et al., 2019. Mass transport induced asymmetry in charge/discharge behavior of liquid metal batteries. Electrochemistry Communications 105, 106496. doi:10.1016/j.elecom.2019.106496i
[3] Weier et al. 2017. Liquid metal batteries-materials selection and fluid dynamics, IOP Conf. Series: Materials Science and Engineering 228, 012013. doi:10.1088/1757-899X/228/1/012013

Department: Magnetohydrodynamics

Contact: Personnettaz, Paolo

Requirements

• interest in numerical simulation of multi-physics phenomena (thermo-fluid-dynamics and electrochemistry),
• bachelor degree in engineering, physics or mathematics,
• basic knowledge of continuum mechanics (e.g. heat transfer, fluid dynamics),
• experience with numerical methods and their implementation,
• ideally experience in computational fluid dynamics.

Helpful:
• basic knowledge of electrochemistry,
• experience with numerical simulation,
• programming experience with Python and/or C++,
• familiarity with GNU/Linux environment.

We offer:
• exciting work environment on an attractive research campus,
• possibility to learn how to use one of leading CFD software (OpenFOAM) on HPC through the full CFD workflow.

Conditions

Duration: 6 months

Links:

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

Druckversion


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

Druckversion


Untersuchung konvektionsgetriebener Beeinflussung des Erstarrungsgefüges von Leichtmetalllegierungen (Id 234)

Bachelor theses / Master theses / Diploma theses / Student Assistant

Die Gefügeeigenschaftsbeziehungen fordern für Konstruktionswerkstoffe zumeist ein möglichst feines, homogenes und isotrop belastbares Erstarrungsgefüge. Für Aluminiumgusslegierungen wird dies durch Zusätze von Veredelungs- und Kornfeinungsmitteln erreicht. Diese Zusätze verursachen Kosten, sind problematisch bezüglich Recycling sowie dem Umweltschutz und haben weitestgehend keinen positiven Einfluss auf intermetallische Verbindungen. Es besteht daher der Wunsch, ohne Zusätze ein feines und homogenes Erstarrungsgefüge einstellen zu können. Ein probates Mittel ist der Einsatz von elektromagnetischen Feldern. Diese sind für Leichtmetallschmelzen zur kontaktlosen Erzeugung einer Strömung mit nachweislich positiven Effekten geeignet. Dabei sind die Auswirkungen auf die Morphologie von intermetallischen Verbindungen kaum erforscht.

Ziel ist es, mit Hilfe von elektromagnetisch erzeugter Konvektion die Kristallisationsmorphologie von intermetallischen Phasen zu verändern und gleichzeitig Kornfeinungsmittel ganz oder teilweise zu substituieren. Für die wissenschaftliche Bewertung der Aluminium-Gussbolzen ist eine qualitative und quantitative Gefügecharakterisierung notwendig. Zusätzlich besteht die Möglichkeit, die Metallurgie von Aluminiumlegierungen kennenzulernen und den Erstarrungsverlauf an Hand von Temperaturverläufen zu studieren. Grundlage für die Arbeit ist es, sich in die Thematik des elektromagnetischen Rührens von Metallen und deren Auswirkung auf das Gefüge einzuarbeiten. Des Weiteren wird eine selbständige Arbeitsweise bei der Gefügeanalyse erwartet. Es sollte Interesse an Erstarrungsvorgängen und der damit einhergehenden Gefügeausbildung bestehen.

Department: Magnetohydrodynamics

Contact: Dr. Räbiger, Dirk, Willers, Bernd

Requirements

Die Ausschreibung richtet sich an Studentinnen und Studenten der Fachrichtung Werkstoffwissenschaft, Giessereiwesen, Urformtechnik, ...

Conditions

Beginn: ab sofort
Bearbeitungszeit: Variabel nach Interesse und Themenauswahl
Bewerbung mit Lebenslauf und Zeugnissen
Vergütung nach hausinternen Vergütungsregeln

Online application

Please apply online: english / german

Druckversion