Measurement of Interfacial Configuration of Bubbly Flow under Normal and Microgravity Conditions using Stereo Image-Processing Method.

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  • ステレオ画像解析法による微小重力／通常重力下の気泡流界面測定
  • ステレオ ガゾウ カイセキホウ ニヨル ビショウ ジュウリョク ツウジョウ ジ

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Abstract

One interesting phenomenon in a vertical bubbly flow is that bubbles sliding near a wall can exit under certain flow conditions. It has been reported that the lift force pushing the bubbles into the wall is generated by a bubble moving with slip velocity. We present an experimental study of bubble configuration in a gas-water bubbly flow under microgravity conditions carried out using on underground drop tower at the Japan Microgravity Center. The purpose of the experiment is to clarify the effect of reduced slip velocity between the gas and liquid phases on bubble configuration when the conditions vary from normal to microgravity. The bubble configuration, that is the diameter and position of the bubbles in the tube cross section, has been measured in detail using a stereo imageprocessing method (SIM). The results showed that the void fraction profile changes from a saddle shape that has a local void peak near the wall in sliding bubbly flow under normal gravity conditions before the drop, to a parabolic shape or a power-law shape that is approximated by a power-law function in core bubbly flow under microgravity conditions. The void fraction profile can be explained by simulation analysis.

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