1927 音波撹乱による衝突噴流の熱伝達制御 : 加振モードによる比較(S21-5 噴流,後流及びはく離流れの流動解析と応用(5),21世紀地球環境革命の機械工学:人・マイクロナノ・エネルギー・環境)

概要

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The experimental study of flow field and heat transfer characteristics of a rectangular jet impinging normally flat plate is performed. The jet velocity is set equal to 10 m/s which corresponds to Reynolds number of 6700. The excitation frequency is set at F_n=300Hz, F_n/2, 2F_n, where F_n is the natural frequency of the jet. Velocity distributions with two excitation modes are investigated by means of hot-wire measurement. We focused on the influence of forcing frequency and of the excitation mode (symmetric mode and asymmetric mode) on the heat transfer coefficient. As a result, for the short nozzle-to-plate spacing, the heat coefficient is enhanced with the both excitation modes of f_p=2F_n. A non-periodic velocity fluctuation enhanced the heat transfer, but there is little effect of a periodic velocity fluctuation.
一般社団法人日本機械学会の論文
2008-08-02