The aim of this thesis is to study the development and application of an in-situ measuring method that investigates the temperature and convection fields in fluids under high pressure conditions. The incentive came from the promising research into the high pressure treatment of foods. The developed measuring technique HP-PIT (High Pressure- Particle Image Thermography) can be applied up to 700 MPa and is based on the selective reflexion of thermochromic liquid crystals. Using this technique the processes of forced and thermal convection, as well as processes of thermal compensation, have been studied for the first time. The performed experiments show the effect of the viscosity and the rate of pressure on the generated thermal and hydrodynamic processes.
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