CAJ | 학술논문

采用双头光纤探针对内径为50 m m竖直圆管内空气-水两相泡状流界面参数径向分布特性进行了实验研究。气液两相表观速度变化范围分别为0.004～0.05 m/s和0.071～0.283 m/s。结果表明，竖直管内向上泡状流局部界面面积浓度（IAC ）、空泡份额及气泡频率径向分布相类似，即气相流速较低时管道中间很大范围内以上3个局部界面参数几乎恒定，近壁区迅速下降到较低值；随气相流速的增加，局部界面参数在管道中心出现峰值。本实验中气泡聚合与破碎现象较少发生，索特平均直径沿径向近似均匀分布，且随气液两相流速变化很小。通过气泡横向受力解释了局部界面参数分布的影响机理。
채용쌍두광섬탐침대내경위50 m m수직원관내공기-수량상포상류계면삼수경향분포특성진행료실험연구。기액량상표관속도변화범위분별위0.004～0.05 m/s화0.071～0.283 m/s。결과표명，수직관내향상포상류국부계면면적농도（IAC ）、공포빈액급기포빈솔경향분포상유사，즉기상류속교저시관도중간흔대범위내이상3개국부계면삼수궤호항정，근벽구신속하강도교저치；수기상류속적증가，국부계면삼수재관도중심출현봉치。본실험중기포취합여파쇄현상교소발생，색특평균직경연경향근사균균분포，차수기액량상류속변화흔소。통과기포횡향수력해석료국부계면삼수분포적영향궤리。
The experimental study was performed on characteristics of interfacial parameters radial distribution of air-water bubbly flow by using a two-head optical fiber probe in a vertical circular tube with the inner diameter of 50 mm .The gas and liquid superficial velocities cover the ranges of 0.004-0.05 m/s and 0.071-0.283 m/s , respectively . T he results show that the local interfacial area concentration (IAC ) , bubble frequency and void fraction nearly have the same distribution ,that is ,the three interfacial parameters almost keep constant along radius except in the near wall region w here it falls to a low value with a low gas velocity ;as the gas velocity increasing ,the interfacial parameter has a peak value in the core region of circular tube . In the experiment ,few bubble coalescence and breaking up occur ,and the bubble Sauter mean diameter distribution in the radial direction is approximately uniform and changes little with gas and liquid velocities .The lateral bubble force in cross section is considered to explain the local parameters distribution pattern .