Flow and temperature field measurements of thermal convection in a small vertical gap using liquid crystals |
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Authors: | Hans Georg Heiland Günter Wozniak Klaus Wozniak |
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Institution: | 1. Institute of Mechanics, Chair of Fluid Mechanics, Chemnitz University of Technology, 09107, Chemnitz, Germany 2. SIVUS gGmbH, Schulstra?e 38, 09125, Chemnitz, Germany
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Abstract: | Thermal convection in a small vertical gap is studied experimentally applying digital particle image velocimetry/thermometry.
This optical method enables the simultaneous measurement of two-dimensional flow and temperature fields in a liquid. The principle
is based on seeding the liquid flow medium with thermochromic liquid crystal particles. The temperature is measured by the
crystal particles which change their reflected colour as function of temperature. The flow velocity is measured by using the
same particles as flow tracers. The investigation shall contribute to the understanding of the fluid mechanical behaviour
of biological liquids within micro reactor systems. However, the problem is also of fundamental interest as far as heat and
mass transfer is concerned. Measured temperature and flow velocity fields are presented and discussed.
Presented in part at the 4th Chemnitz/Hamburger Colloquium (CHC) on Microflows, Hamburg, Germany, November 2004. |
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