| Summary: | 碩士 === 元智大學 === 機械工程學系 === 95 === The purpose of the study is to investigate flow patterns, temperature and concentration distributions resulting from buoyancy force due to a combination of temperature and species convection effects in an annular enclosure.
In this experiment, the temperature and the concentration differences are made between the inner and the outer cylinder. Cupric Sulphate solution is selected as the working fluid. Two constant temperature baths keep the temperature gradient. The concentration gradient is controlled via electrochemical system. The temperature and concentration gradients are imposed in such a way that their effects on the flow were either cooperating or opposing.
In order to visualize the flow, the shadowgraph technique is used. Electrical measurements will be used to obtain mass transfer rates and to infer a Sherwood number.
To understand the flow structure, the temperature distribution and concentration distribution are investigated. Finally, the correlations between Sherwood number and solutal, Grashof number and thermal Grashof number are also needed to be analyzed.
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