2246 鉛直円管内気泡流における壁面近傍の乱流特性

概要

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Sufficient knowledge of turbulence modification is indispensable to understand the turbulence structure and to develop a turbulence model in gas-liquid two-phase bubbly flow in vertical pipes. There is, however, little information on the interaction between shear-induced turbulence and bubbles in the near wall region, whereas many researches have been carried out on the turbulence properties in gas-liquid bubbly flow in a vertical pipe. In this study, we measured liquid velocity in the near wall region where the shear-induced turbulence is generated and interacts with bubbles. The measured result indicated that (1) bubbles increase the gradient of mean liquid velocity and therefore the shear-induced turbulence is enhanced in the near wall region, and (2) bubbles break up the developed large-scale shear-induced eddy and obstruct the transfer of turbulence energy from the near wall region to the core region.
社団法人日本機械学会の論文
2003-08-05