Heat Transfer Analysis of Laminar Flows Over Concave, Convex and Ribbed Surfaces
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In the present study, the heat transfer characteristics of laminar air flows over concave, convex and ribbed surfaces has been investigated experimentally. Experiments are performed at the inlet Reynolds Numbers of 9×104 and 2×105.A constant–temperature hot wire anemometer and copper-constant thermocouples are used to measure velocity and temperature values, respectively. The results show that the heat transfer rates are increased by the concave e and ribbed surface comparing to the flat plate, while decreased by the convex surface. It is noted that ribs give the higher heat transfer augmentation than concave wall. Moreover, it is found that the heat transfer variations are more excessive at the bigger Reynolds Number on all surfaces
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