往復流動場における平板上の対流熱伝達

概要

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To attempt the heat transfer enhancement, the experimental investigation of convective heat transfer on the flat plate in the reciprocating oscillatory air flow was carried out. The tested plate was installed on the center of the passage in the closed circular pipe with the oscillatory flow. The oscillatory flow such as infrasonic flow was occurred up to the resonance flow by a pump which was composed of a crank and piston mechanism. The velocity of oscillatory flow above the tested plate was estimated by the hot wire anemometer and FFT analyzer. The temperature of oscillatory flow and the surface temperature of the tested plate were measured by thermocouples. The rotating speed of a crank was changed in the range of 20-1200 rpm, the piston strokes were 5 cm and 15 cm, and the heat flux on the tested plate was changed to occur the effect of natural convection. The velocity of oscillatory flow increased significantly in according to the increase of the rotating speed. The empirical formulas for the average heat transfer coefficient on the tested plate in the oscillatory flow with including near the resonance were established as functions of Reynolds number and Grashof number in the all range over the rotating speed.
福山大学の論文