疏水微通道内流动冷凝流型实验研究  

Experimental Study of Flow Condensation Pattern in Hydrophobic Microchannels

作　　者：沈超群[1] 陈永平[1] 施明恒[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《工程热物理学报》2013年第1期118-120,共3页Journal of Engineering Thermophysics

基　　金：江苏省自然科学基金资助项目(No.BK2011062);教育部博士点基金资助项目(No.20110092110049)

摘　　要：实验观测了水力直径为150μm,宽深比3,通道壁面水接触角为130°的疏水矩形微通道内的流动冷凝过程。发现疏水微通道内的流型主要有珠状流、珠状-环状复合流、珠状-喷射复合流和弹状-泡状流。由于壁面的疏水性,喷射流处仍能观察到珠状凝结。珠状-喷射复合流的位置随入口蒸汽Reynolds数的增大而向通道出口移动,喷射频率随Re_v增大而增大。珠状-喷射复合流之后为弹状-泡状流,喷射流产生汽泡会冲击前一汽泡并合并流向通道出口。Visualization experiment is conducted to study the flow condensation in hydrophobic rectangular microchannels with the hydraulic diameter of 150 urn,width/depth ratio of 3.and water contact angle of 130°.Along the flow direction,droplet flow,droplet-annular compound flow, droplet-injection compound flow and slug-bubble flow are observed.Due to the hydrophobicity of the wall surface,droplet condensation still exists at the injection flow regime.With the increasing inlet vapor Reynolds number,the location of the droplet-injection compound flow moves towards the outlet of channel,and the injection frequency also increases with the increasing Re_v.After the droplet-injection compound flow,slug-bubble flow arises,the steam bubble generated by the injection will impinge the front one and flow to the outlet after combination.

关 键 词：流动冷凝 疏水微通道 流型 珠状凝结 

分 类 号：TK124[动力工程及工程热物理—工程热物理]