0508 水平チャネル内流れにおける摩擦低減条件での気泡群の挙動(OS5 混相流の多次元可視化計測,オーガナイズドセッション)

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  • 0508 Behavior of bubble clustering under a drag reduction condition in a horizontal channel flow

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Experimental investigation on drag reduction by air bubble injection is carried out to elucidate the influence of bubble clustering in a horizontal rectangular channel. Silicone oil is used as working fluid so that experimental uncertainty due to contamination is removed particular for the clustering phenomenon. Bubbles formed chained arrangement in the streamwise direction on laminar flow states, and disperse isotropically on turbulent states. Such a bubble clustering behavior is analyzed quantitatively with image processing to obtain probability distribution of the nearest bubbles.

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