Influence of Wettability on Slug Flow in Micro Channels
Influence of Wettability on Slug Flow in Micro Channels
复制标题
DOI：
10.11322/tjsrae.18-44ac_oa
复制
发表时间：
2018-12
期刊：
影响因子：
--
通讯作者：
Jingren Xu;C. Dang;E. Hihara
中科院分区：
文献类型：
--
作者：
Jingren Xu;C. Dang;E. Hihara
微通道内的两相流由于其较高的传热传质效率而成为近年来的研究热点，本文对微通道内弹状流中润湿性对两相流的影响进行了实验研究。利用激光聚焦位移计和高速摄像机分别对水-空气弹状流的液膜厚度和流动特性进行了实验研究。通过表面化学处理（使用化学表面活性剂：食人鱼溶液和甲苯），将内径为0.76 mm和1 mm的圆形玻璃管制备为亲水或疏水。实验结果进行了比较和讨论，以获得润湿性的影响，作为一个结果，发现在疏水和亲水微通道的液膜厚度是相似的，这是兼容的理论分析。而在低毛细数区，流动特性受润湿性影响，此时无液膜存在。管壁成膜的临界毛细管数受管壁疏水性的影响，疏水管的临界毛细管数高于亲水管。
Two phase flow in micro channel has been of research interest recently due to its high heat and mass transfer rate, and in this study, experimental investigation is performed on the influence of wettability of the tube in slug flow. The liquid film thickness and flow behavior of water-air slug flow are investigated by using laser focus displacement meter (LFDM) and high-speed camera, respectively. Circular glass tubes with inner diameters of 0.76mm and 1mm are prepared to be hydrophilic or hydrophobic by applying surface chemical treatment (using chemical surfactant: piranha solution and toluene). The experimental results are compared and discussed to obtain the influence of wettability, and as a result, the liquid film thickness is found to be similar in hydrophobic and hydrophilic micro channels, which is compatible with theoretical analysis. However, the flow characteristics is influenced by wettability at low capillary number region, at which no liquid film exists. The critical capillary number for film deposition on the wall is influenced by the hydrophobicity of the tube, consequently, the critical capillary number is higher in a hydrophobic tube than that in hydrophilic one.