平面壁上の複数突起列に沿う流れおよび熱伝達に突起形状が及ぼす影響

概要

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This paper describes the comparison of the flow structure over the rows of two-dimensional ribs of various rib shapes on the ground plane. The pitch between the centers of two adjoining ribs was varied for several rib shapes. Six two-dimensional rib shapes were used in this experiment. The time-mean velocity and turbulence intensity were measured by laser Doppler velocimetry. The auto-correlation was obtained using a data processing system and Fast Fourier Transform analyzer connected to a hot-wire anemometer. The mean temperature was measured with thermocouples and the local heat transfer coefficient was obtained from these data. The turbulence intensity and heat transfer coefficient become largest and the pressure loss is minimum for the semi-elliptic ribs, among all the rib shapes used in this experiment. As a result it is concluded that semi-elliptic ribs aligned at pitch ratio S/D=7 have the optimum shape to promote heat transfer.
一般社団法人日本機械学会の論文
1993-07-25