A-9 Heat Transfer in Channels with Convergent walls and Cylindrical Fins : Entrance Fin Height to Diameter Ratio=1

概要

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Detailed heat transfer measurements using an IR imaging system were conducted on channels equipped with circular pin fins with the pin fin height to diameter ratio=1. The Reynolds number based on the pin fin diameter and mean velocity at the first pin fin row ranged from Re=1000 to 15000. Measurements were performed for three different convergence angles α=0° (parallel side walls), 2.5° and 5°. The results revealed that the best heat transfer is obtained in the case of α=5° where the flow acceleration greatly enhances the heat transfer, which is clearly superior to the α=0°, 2.5° channels. Only an insignificant difference in the overall heat transfer was found between the α=0°, 2.5° channels. All channels displayed an improved heat transfer towards their outlet as a result of turbulence promotion and flow acceleration (only α=2.5°, 5°).
社団法人日本ガスタービン学会の論文
1999-08-13