Experimental and theoretical study of pool boiling heat transfer and its CHF mechanism on femtosecond laser processed surfaces

作     者：Liu, Bin Liu, Jie Zhang, Yonghai Wei, Jinjia Wang, Wenjun 

作者机构：Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Shaanxi Peoples R China Xi An Jiao Tong Univ Sch Mech Engn Xian 710049 Shaanxi Peoples R China 

出 版 物：《INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER》 (国际传热与传质杂志)

年 卷 期：2019年第132卷

页      面：259-270页

核心收录：

学科分类：080702[工学-热能工程] 08[工学] 0807[工学-动力工程及工程热物理] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Natural Science Foundation of China [51636006, 51611130060, 51506169] Fundamental Research Funds For the Central Universities [cxtd2017004, xjj2017085] scientific research program for new lecturer of Xi'an Jiaotong University [DW010728K000000B] China Postdoctoral Science Foundation [2015M582653] Postdoctoral Research Project of Shaanxi Province [2016BSHEDZZ131] 

主　　题：Boiling heat transfer Femtosecond laser processing Critical heat flux Micro/nano hierarchically structure 

摘      要：In the present study, the pool boiling heat transfer of micro/nano hierarchically structured surfaces, as well as that of a smooth surface in gas dissolved FC-72 (the subcooling is 1 K) was studied. Femtosecond laser processing was used to fabricate the structured surfaces. It was found that for the surfaces with small processing spacing (LS30 and LS70, where the number after LS specifies the spacing in mu m), the critical heat flux (CHF) showed almost no increase, while the heat transfer coefficient (HTC) was enhanced noticeably compared to that of a smooth surface (SS). For LS100, LS200, LS200-2 (compared to LS200, LS200-2 has the same processing spacing but a much higher peak-to-valley height), LS400 and LS800, both the CHF and HTC were enhanced remarkably compared to those of SS. The maximum HTC enhancement was obtained for LS70, with the HTC being 5.87 times larger than that of SS. The most remarkable increase in the CHF was achieved for L5200-2, with an improvement of 91% relative to that of SS. The liquid supply mechanism at the CHF of the micro/nano hierarchically structured surfaces was investigated. A modified model taking into account the coalesced bubble departure frequency, Jakob number and capillary wicking effects was proposed for CHF prediction. The CHF data from this study and the literature were used to validate the model, and it was found that the predicted results agree quite well with the experimental data within 8%. (C) 2018 Elsevier Ltd. All rights reserved.