Welcome to group 8: High Pressure Thermofluiddynamics and Rheology
The group deals with a large variety of topics. We study the effect of pressure up to about 900 MPa on organic and biomaterials. Pressure levels of more than 100 MPa may yield pressure-induced solidification, protein denaturation, dramatic changes in enzyme activity and inactivation of micro-organisms. Hence, they are not only relevant for diesel injection but also for food preservation and processing, and are promising for the preparation vaccines.
Rheology studies the flow behavior and the deformation and of materials under mechanical load. The material behavior is often governed by its often complex microstructure and its respective changes under load. We are especially interested in narrow-gap rheometry. Therefore, we set up an narrow-gap rotational rheometer. Measuring rheological properties of layer as thin as a few micrometers has many advantages: Only very few amount of sample is needed, viscosity and normal-stress differences can be studied at shear rates that are up to 2 decimal powers higher than in standard rheometers, average rheological quantities of cells may be determined in single runs...
Besides high pressures and complex material behavior, we are interested in general fluid dynamics. Here our focus is on particle-ladden flows and on geometry-induced qualitative changes of flow regimes for passive flow control and to yield optimum flow regimes.
Main directions of research:
- Effects of high pressure on organic and biomaterials
- Development of experimental methods for in-situ measurements under high pressure
- Rheology of micellar solutions
- Narrow-gap rheometry
- Onset of particle motion
- Geometry-induced optimum flow regimes in film flows