纳米流体在超亲水微槽道热管中的润湿特性研究  

Investigation of Nanofluid Wetting Characteristics in Superhydrophilic Microgrooved Heat Pipe

作　　者：张云鹏 刘斌[1,2,3] 贾潇 周敬之 淮秀兰 李石琨[1] ZHANG Yunpeng;LIU Bin;JIA Xiao;ZHOU Jingzhi;HUAI Xiulan;LI Shikun(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of engineering science,University of Chinese Academy of Sciences,Beijing 100049,China;Nanjing Institute of Future Energy System,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Nanjing 211135,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]中科院工程热物理研究所南京未来能源系统研究院,南京211135

出　　处：《工程热物理学报》2022年第6期1572-1579,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51606190)。

摘　　要：微槽道热管的性能很大程度上受限于毛细极限,改变槽道表面性质或采用新型流体工质来提升润湿长度是解决该问题的有效方法。本文基于自适应理论,发展了用于预测纳米流体在矩形微槽道中润湿长度的理论模型。结果表明:由于接触角的影响,相比于普通表面微槽道,在超亲水表面微槽道中SiO_(2)纳米流体的润湿长度显著增加;在超亲水表面微槽道中,润湿长度主要受到表面张力的影响,因此自适应润湿长度L_(a)和角流区润湿长度L_(c)随着纳米颗粒粒径的减小和体积分数的增加而减少;在普通表面微槽道中,接触角对L_(a)的影响大于表面张力,因此L_(a)随着纳米颗粒粒径的减小和体积分数的增加而上升。The performance of the microgrooved heat pipe is greatly affected by the capillary limit.Changing surface properties of the microgroove and using a new fluid working medium to increase the wetting length are effective methods to solve this problem.Based on the accommodation theory,this paper develops a theoretical model to predict the nanofluid wetting length in rectangular microgrooves.Results suggest that the wetting length of the SiO_(2) nanofluid in the superhydrophilic microgroove was significantly longer than that of the pristine microgroove because of the effect of the contact angle.In superhydrophilic microgroove,the wetting length was mainly affected by surface tension,so the accommodation wetting length La and the corner flow wetting length Lc declined with the decrease of the nanoparticle size and the increase of the volume fraction.In pristine microgroove,the influence of contact angle on L_(a) was greater than surface tension,so L_(a) rose with the decrease of the nanoparticle size and the increase of the volume fraction.

关 键 词：微槽道热管 润湿特性 超亲水 纳米流体 

分 类 号：TK172.4[动力工程及工程热物理—热能工程]