Abstract Two-phase flow characteristics of gas injection through a slot nozzle into a liquid bath were studied experimentally. A dual-sensor electrical probe measurement system was used to obtain the distributions of multiple two-phase flow parameters. Measurements were conducted under various gas flow rates, nozzle widths and at different planes vertical to the slot nozzle. It is found that the void fraction, interfacial area density and bubble frequency show peak value in the nozzle center and decrease rapidly away from the nozzle exit. Both the void fraction and interfacial area density increase drastically with increasing gas injection rates, while the bubble frequency remains almost unchanged. However, the effects of two different nozzle widths (0.1 mm and 0.5 mm) on the above three parameters are not significant. As the measurement plane deviates from the center plane vertical to the slot nozzle, all the above three parameters show slight decreasing trends indicating the bubble plume is contracting to the nozzle center downstream. For the measurement zone 15 mm above the nozzle exit, the apparent bubble diameter and velocity remain almost constant in the whole flow field for each flow configurations. Moreover, good self-similarities were demonstrated for void fraction, interfacial area density and bubble frequency, with their profiles being able to collapse into a Gaussian function.

中文翻译：

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狭缝喷嘴气体垂直注入液浴两相特性的实验研究

摘要 实验研究了气体通过狭缝喷嘴注入液浴的两相流动特性。双传感器电探针测量系统用于获得多个两相流参数的分布。在不同的气体流速、喷嘴宽度和垂直于狭缝喷嘴的不同平面上进行测量。发现空隙率、界面面积密度和气泡频率在喷嘴中心出现峰值，并在远离喷嘴出口处迅速减小。随着气体注入速率的增加，空隙率和界面面积密度都急剧增加，而气泡频率几乎保持不变。但是，两种不同的喷嘴宽度（0.1 mm 和 0.5 mm）对上述三个参数的影响并不显着。当测量平面偏离垂直于狭缝喷嘴的中心平面时，上述三个参数均显示出轻微的下降趋势，表明气泡羽流向下游喷嘴中心收缩。对于喷嘴出口上方 15 mm 的测量区域，对于每种流动配置，表观气泡直径和速度在整个流场中几乎保持不变。此外，还证明了空隙率、界面面积密度和气泡频率具有良好的自相似性，它们的轮廓能够折叠成高斯函数。对于每种流动配置，表观气泡直径和速度在整个流场中几乎保持不变。此外，还证明了空隙率、界面面积密度和气泡频率具有良好的自相似性，它们的轮廓能够折叠成高斯函数。对于每种流动配置，表观气泡直径和速度在整个流场中几乎保持不变。此外，还证明了空隙率、界面面积密度和气泡频率具有良好的自相似性，它们的轮廓能够折叠成高斯函数。