| Summary: | 碩士 === 國立交通大學 === 機械工程學系 === 99 === This research presents the transient liquid crystal technique for local heat transfer coefficient measurements in a square channel. Compound cooling technique, by combining more than two heat transfer enhancement techniques, is applied on the surfaces of the square channel. The rib with and without groove configurations are tested: transverse (90°), angled (45°), discrete, V-shaped, and Inverted-V shaped. Reynolds numbers in the current study are from 15000 to 37000. The rib height-to-hydraulic diameter ratio is 0.1, and the rib pitch-to-height ratio is 8. Results show that the 45° ribs and V-shaped rib with groove have the maximum heat transfer enhancement and thermal performance. V-shaped and inverted-V ribs have the maximum friction loss.
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