Practical trainings, student assistants and theses
Offer | All | School practical training | Master theses | Research Assistant | Holiday job | | Volunteer internship | Diploma theses | Bachelor theses | Student Assistant | Compulsory internship |
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Institute/ Dep. | All | FKVF | | FWDF | FWDF-A | FWDF-P | FWDF-V | FWGA-X | FWGP-G | FWGR-H | FWGT-B | FWIO-N | FWIO-T | FWIZ | FWOG | FWPC | FWU |
Formatting | Table | |
Internship on experimental investigation of aerosol propagation (Id 381)
Student practical training / Compulsory internship / Volunteer internship
Background:
Currently, there is a broad discussion whether ventilation by frequent window opening is sufficient for providing a sufficient amount of fresh air or if technical air purification devices based on e.g. HEPA filters are better solutions for public spaces. Furthermore, there is another discussion ongoing, whether a well-guided laminar flow or a high degree of mixing within a room is more beneficial. The latter, on the one hand distributes the potentially virus-laden aerosols in the whole room, but on the other hand reduces the peak concentrations of these aerosols clouds by magnitudes.
Objectives:
The objective is to perform aerosol propagation experiments and to estimate the potential aerosol inhalation of people in dynamic situations. To achieve this, an aerosol generator will be used in a demonstrator room under different flow conditions. The data from different scenarios will be processed in order to obtain a transference function that can relate the aerosol source with the aerosol receivers.
Tasks:
- Literature survey
- Aerosol experiments in different scenarios.
- Post-processing of the results.
Department: Experimental Thermal Fluid Dynamics
Requirements
- Student of natural sciences or engineering
- Willingness to conduct experimental work
Conditions
Duration:
4-6 months
Remuneration:
According to HDZR guidelines
Online application
Please apply online: english / german
Numerical simulation of particles in rising gas bubbles (Id 356)
Student practical training / Master theses / Student Assistant / Compulsory internship / Volunteer internship
The separation of aerosol particles by a moving gas-liquid fluidic interface is central to a wide variety of industrial and natural applications, among which stand out air purification systems and precipitation scavenging. The particle size significantly affects the separation rate. The diffusion of particles in the nanometer range is largely dominated by molecular diffusion. In this regime, predictive models accurately estimate the separation rates. Model inaccuracy increases, however, significantly when the particle size ranges from 0.1 μm to 2.5 μm. In this impaction-dominated regime, the complex interplay between the flow dynamics on both sides of the fluidic interface and the particle inertia makes it difficult to develop suitable models.
In this work, the student will numerically investigate whether enforcing bubble deformation into a non-spherical shape leads to a higher deposition rate, hereby making the particle separation process more efficient. The results will lead to the development of an improved and reliable separation model accounting for the deformation of the fluidic interface and the associated flow changes.
Department: Experimental Thermal Fluid Dynamics
Contact: Maestri, Rhandrey
Requirements
- General interest in fluid mechanics
- Preliminary experience in code development (C++) is desirable
- Good written and oral communication skills in either English or German
Conditions
- Either an immediate start or a start in 2024 is possible
- Duration of the internship is anticipated to be 6 months but can be modified according to study regulations
- Remuneration according to HZDR internal regulations