微细通道内蒸汽直接接触凝结汽液界面演变特征的实验研究  

Experimental study on evolution characteristics of the vapor-liquid interface in direct contact condensation in micro channel

作　　者：张强武 马坤茹[1] 李树谦 卢涛[4] 侯娜娜 ZHANG Qiangwu;MA Kunru;LI Shuqian;LU Tao;HOU Nana(The Construction Engineering College,Hebei University of Science and Technology Shijiazhuang 050018,China;The Civil Engineering College,Hebei University of Water Resources and Electric Engineering,Cangzhou 061001,China;Hebei Technology Innovation Center of Phase Change Thermal Management of Internet Data Center,Cangzhou 061001,China;College of Mechanic and Electronic Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

机构地区：[1]河北科技大学建筑工程学院,河北石家庄050018 [2]河北水利电力学院土木工程学院,河北沧州061001 [3]河北省数据中心相变热管理技术创新中心,河北沧州061001 [4]北京化工大学机电工程学院,北京100029

出　　处：《热科学与技术》2022年第4期329-336,共8页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51976052);河北省自然科学基金资助项目(E2020412176);河北省高等学校科学技术研究重点资助项目(ZD2019032)。

摘　　要：为探究微细尺度条件下蒸汽直接接触凝结汽液界面瞬时特征及演变行为,开展了圆形截面T型微细通道内蒸汽直接接触凝结的可视化实验研究。利用高速摄像系统获取了饱和蒸汽体积流量630μL/min、过冷水温度60℃及过冷水体积流量12650μl/min工况下直接接触凝结过程的瞬时图像信息。研究发现,汽液界面演变历程不能简单的用一种凝结流型进行表述,其过程中包含了柱状、环状和间歇凝结流型的特征。蒸汽自支管入射至主管后其长度经历了相对较长时间(108.2 ms)的振荡增长,而消失过程则相对短暂(16.2 ms)。此外,水平主管内的蒸汽柱先后发生了脱离和断裂现象,且其与支管正下方的蒸汽泡和的凝结机理有所不同。To investigate transient characteristics and evolution behavior of the vapor-liquid interface for direct contact condensation in micro channel, the visual experiments of steam direct contact condensation in circular T-type micro channel were carry out. When the steam temperature, steam volume flow rate, water temperature and water volume flow rate were 100 ℃, 630 μL/min, 60 ℃, and 12 650 μL/min, respectively, the image data of the visualization experimental segment was obtained using a high-speed camera system. The results show that the evolution of the vapor-liquid interface can be accurately described by the condensation pattern which includes columnar flow, annular flow and chugging. The process of an oscillating growth 108.2 ms and a linear shortening process 16.2 ms for steam plume is found since the steam was injected into the horizontal pipe, that v the time of growth takes longer than that of the shortening. Moreover, steam plume within the horizontal pipe has detached from the vertical pipe before the steam plume fractures. And the condensation mechanism of steam plume is different from that of steam bubble below the branch pipe.

关 键 词：T型微细通道 可视化实验 直接接触凝结 汽液界面 脱离和断裂 

分 类 号：TK124[动力工程及工程热物理—工程热物理]