Hochdruckthermofluiddynamik und Rheologie (B8)

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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. An important issue is the adaption of measurement techniques to detect how high pressure affects the systems.

Rheology studies the flow behavior and the deformation and of materials under mechanical load. The material behavior is often governed by a complex microstructure and its respective changes under load. Our main focus is on narrow-gap rheometry. We set up a narrow-gap rotational rheometers that allow measuring rheological properties of layers as thin as a few micrometers. This 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 also study general fluid dynamics. Here our focus is on particle-laden flows and on geometry-induced qualitative changes of flow regimes for passive flow control and to yield optimum flow regimes.

Main directions of research: