| Summary: | 碩士 === 國立臺灣大學 === 機械工程學系 === 85 === The purpose of present study is to investigate the effect of
pressure gradient on the convective heat transfer in fully-
developed turbulent duct flow. A transient liquid crystal
thermochromy is employed to measure local heat transfer
coefficients over the flat plate. In the test wind tunnel, the
main stream velocity can be adjusted from 3m/s to 20 m/s,
corresponding to the Reynolds number range from 3200 to 37700.
On the opposite side of the test flat plate, the pressure
gradient of the main stream can be varied by placing three
different shapes of duct wall ,namely a flat wall, a convex
wall, and a concave wall. Separation can occur on either convex
or concave wall for creating the pressure gradient. Measured
results show that a strong pressure gradient results a great
heat transfer variation on the flat plate. Before the separation
on convex wall.
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