二次元衝突噴流熱伝達に及ぼす衝突面の加振効果

概要

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The present paper describes the vibration effect of impingement surface on two-dimensional impingement heat transfer with confined wall. The local temperature distribution on an impingement surface was measured using a thermosensitive liquid crystal sheet and an image processor. The net heat flux was obtained by solving the three-dimensional heat conduction equation in the heated section. Experiment was carried out by using air as a working fluid. Experimental conditions were as follows; Reynolds number Re=1000〜10000, dimensionless distance between nozzle and impingement surface h/B=1.0〜4.0, frequency f=0〜100 Hz and amplitude a=0.5, 1.0 mm. Local Nusselt number was improved for comparatively low Reynolds number and low frequency and was depressed for high frequency. In the case of heat transfer enhancement, vortices on the impingement surface were renewed frequently, and on the other hand, in the case of heat transfer depression, thermal boundary layer thickness increased in appearance by the vibration of impingement surface.
一般社団法人日本機械学会の論文
1999-09-25