Liquid Turbulence Parameters in Bubbly Two-Phase Flows

对垂直管内气水两相气泡湍流流动进行了实验研究。浓度低于10%的小而均匀的气泡将被产生，使得在相同几何形状的单相流中有明确的偏离。液相平均底面和湍流参数将通过热膜测速仪测量，并使用移动窗口统计技术来确定数据的接受标准。利用图像数字化和空间滤波增强边缘对比度，光学获得气泡浓度和尺寸分布的径向分布。I)径向空泡率数据将与在其他地方使用侵入性探头获得的数据进行比较。关于气泡产生、输送和耗散湍流能量的新信息是可以预见的。

An experimental study of an air-water bubbly turbulent flow in a vertical pipe will be conducted. Small uniform bubbles will be generated in concentrations less than 10 percent, making for a well-defined departure from single-phase flow in the same geometry. Liquid-phase mean-floor and turbulence parameters will be measured by hot-film aneometry, with moving-window statistical techniques to determine acceptance criteria for data. Radial profiles of bubble concentration and size distribution will be obtained optically, using image digitization and spatial filtering to enhance edge contrasts. i) The radial void fraction data will be compared to data obtained elsewhere with intrusive probes. New information on the production, transport, and dissipation of turbulent energy by the bubbles is anticipated.