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化工学报  2012 

竖直大圆管内两相流界面分布机理

DOI: 10.3969/j.issn.0438-1157.2012.12.011, PP. 3812-3818

Keywords: 界面面积浓度,大管径,升力

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Abstract:

采用光纤探针测量方法对垂直上升管中空气-水两相泡状流界面分布特性进行了研究。实验选用的圆管直径为100mm,气相、液相表观速度的范围分别为0~0.1m·s-1和0~1.0m·s-1。获得了界面面积浓度(IAC)、截面含气率、气泡直径等分布规律。通过气泡的受力分析,发现升力和湍流扩散力的综合作用导致了气泡的径向运动,而且升力对径向IAC分布的影响占主导地位;当气泡直径超过临界尺寸(5.7mm)后,升力系数变为负值,使得升力指向管中心,进而导致了IAC分布由壁峰型向核峰型分布的转变。

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