540 上昇微細気泡が誘起する疑似乱れによる対流熱伝達(マイクロスケール流れに対するシミュレーション技術とその応用,OS23 マイクロスケール流れに対するシミュレーション技術とその応用)

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  • 540 Heat transfer in pseudo-turbulence induced by rising small bubbles

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Direct numerical simulations (DNS) have been conducted for the heat transfer in pseudo-turbulence induced by small contaminated bubbles. The void fraction ranges from 1.5% to 9.0%. Air bubbles with a diameter of 500μm, are considered. We imposed a constant temperature gradient in the vertical or horizontal directions. Computational results show that the heat transfer in the case of vertical temperature gradient is highly enhanced by a bubble in pseudo-turbulence. With the increase in void fraction, the heat transfer is attenuated in the case of vertical gradient while the heat transfer is enhanced in the case of horizontal gradient.

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