Postdoc Position

A two year postdoc position (with possible extension) is available from March 2019. The candidate should have a curiosity driven approach to science. I’m looking for an experimentalist with affinity for theory or vice versa. With specific interests in multiphase flows, soft matter, cavitation, bubble dynamics, impact phenomena, acoustics, and similar. Please send an email to me.

Master and Bachelor Projects

We are looking for research interns for Bachelor and Master Projects. If you are interested, please drop a brief email and/or pass by in the office (Building 16, Room 102). The projects are equally suited for students from process engineering (Verfahrenstechnik), mechanical or electric engineering.

Below are a few suggestions for projects, yet we can adapt them or come up with new ones depending on your interest and availabilty.

(A) Printing with Metal

Inkjetprinters accelerate ink impulsively through a thin nozzle. Behind the nozzle a short jet forms and pinches off a droplet. The droplet then impacts onto the paper. We would like to do the same for liquid metal. This is a non-trivial scaling of the original problem as water (ink) and liquid metal have largely different surface tension and density. Further cooling may change the viscosity of the liquid metal and thus affect the shape of the droplet. In this project you will be extending a present experiment and conduct it: the droplet generation will be visualised with stroboscopic and high-speed photography. You will also try to determine the borders of droplet generation through suitable non-dimensional numbers. If all goes well, you may try to simulate the droplet generation and compare with your experiments.

(B) Merging Levitating Droplets

Acoustic Levitation allows to transport droplets without physical contact to a substrate. The working principle is the radiation force in an intense acoustic field which balances gravity. In a simple standing wave field a droplet can be fixed at one location in 3d space, while a phased array allows to change the location of the trap. By this way the droplet may be transported. The idea of this project is to merge two droplets to induce a chemical reaction between the droplets. You will be setting up a standing wave field with multiple traps to levitate and transport two droplets/objects. Upon chemical reaction (which should be violent and exothermic) should be visualized with a high-speed camera.

Requirements for all projects:

  • Bachelor or Master student in Physics, process engineering, or mechanical engineering
  • Interest (not knowledge) in experimental work, image processing, numerical simulations, programming and electronics
  • Hands on attitude!