混合润湿微结构楔形通道表面池沸腾换热研究  

Study on Pool Boiling Performance of the Mixed Wettability Microstructur Surface With Wedge-shaped Channels

作　　者：唐叶 王雪丽 姬长发[1] 张鹏举 张永海 TANG Ye;WANG Xueli;JI Changfa;ZHANG Pengju;ZHANG Yonghai(College of Energy Engineering,Xi'an University of Science and Technology,Xi'an 710054;College of Chemical Engineering and Technology,Xi'an Jiaotong University,Xi'an 710049)

机构地区：[1]西安科技大学能源学院,西安710054 [2]西安交通大学化学工程与技术学院,西安710049

出　　处：《工程热物理学报》2024年第12期3837-3844,共8页Journal of Engineering Thermophysics

基　　金：陕西省科技厅自然科学基金项目(No.2021JQ-569)。

摘　　要：为研究微结构楔形通道对池沸腾换热性能的影响,本文设计加工了微柱区域与光滑通道面积比近似为1:1的3种混合润湿性结构表面(分别为雪花表面、多星表面和少尖表面),并进行了以FC-72为工质的池沸腾换热性能研究。结果表明,对于3种结构表面,汽泡首先在疏水微柱阵列区域生成、长大,然后横向滑移到光滑亲水通道,在该通道内继续生长直至脱离。少尖表面的光滑通道开口朝向换热面中心,且越靠近中心处通道越宽。冷却液体能迅速地向生成汽泡的微柱区域供应,同时大汽泡在光滑通道内及时脱离,因此少尖表面的池沸腾换热性能最好。随着过冷度增大,各表面CHF增大。换热表面蒸汽柱底部汽膜的出现严重阻碍了液体向换热面的供应,导致局部干涸并引发了CHF。To study the effect of micro-structured surface with wedge-shaped channel on pool boil-ing heat transfer performance of FC-72,three kinds of mixed wettability surfaces with area ratio of the micro-pillar region to the smooth channel region of approximately 1:1 were fabricated in this study(the surfaces were denoted as the Snowflake surface,Multi star surface,and Less tip surface).The experimental results indicated that for the three surfaces,bubbles are firstly generated and grown in the hydrophobic micro-pillar array region,and then slid laterally to the smooth hydrophilic channel region,where they continue to grow up until the final detachment.The opening of the smooth channel on Less tip surface is toward the surface center,and the closer to the center the wider the smooth channel.The cooling liquid can be quickly supplied to the micro-pillar area where bubbles are generated,meanwhile the abundant liquid inside the smooth channel can also promote the timely departure of large bubbles,which accordingly leads to the best boiling heat transfer per-formance on Less tip surface.The CHF value of all surfaces increase with liquid subcooling.The formation of vapor film at the bottom of vapor columns gravely impedes the fresh liquid supply to heat transfer surface,resulting in the local dryout and the trigger of CHF.

关 键 词：微柱阵列 楔形通道 混合润湿 强化换热 池沸腾 

分 类 号：TK124[动力工程及工程热物理—工程热物理]