Abstract
Mixed convective vortex flow in the 3-D horizontal rectangular channel filled with high viscous fluid is investigated for various aspect ratio experimentally. The particle image velocimetry technique with thermo-sensitive liquid crystal tracers (PIT) is used for visualizing and analysis. This method allows simultaneous measurement of velocity and temperature. Quantitative data of temperature and velocity are obtained by applying the color-image processing to a visualized image, and neural network is applied to the color-to-temperature calibration. In this study, the working fluid is silicon oil (Pr = 909), the aspect ratio (channel width to heigh) is varied from 2 to 6 at constant Reynolds number (Re = 4×10<SUP>-3</SUP>). From the present study, the temperature and velocity of mixed convective vortex flow can be visualized simultaneously, and it is found that the longitudinal roll number in the channel is increased with increasing aspect ratio, and the experimental results agree well with numerical results.
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