文献类型：期刊文献

英文题名：Performance of pool boiling with 3D grid structure manufactured by selective laser melting technique

作者：Zhang, Chi[1];Zhang, Li[1];Xu, Hong[1];Li, Pei[2];Qian, Bo[2]

机构：[1]East China Univ Sci & Technol, State Key Lab Chem Engn, Sch Mech & Power Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2019

卷号：128

起止页码：570

外文期刊名：INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER

收录：;EI(收录号：20183805819699);WOS:【SCI-EXPANDED(收录号:WOS:000449445600048)】；

基金：This work was supported by the National Natural Science Foundation of China (No. 51776074) and the Fundamental Research Funds for the Central Universities (No. 222201717012, No. 222201718005).

语种：英文

外文关键词：Pool boiling; Selective laser melting; Grid structure; Critical heat flux

摘要：3D thin wall grid structures were manufactured with selective laser melting (SLM) technique for boiling enhancement. To precisely control the structure parameters and investigate their influences on boiling heat transfer characteristics, the scan line spacing method was adopted to manufacture various grid width and wall height structures. The stainless steel was chosen as the building material. Pool boiling experiment results showed that grid structures could significantly influence nucleate boiling behavior and enhance critical heat flux (CHF). The nucleate boiling heat transfer coefficient generally decreased with grid width except for the 0.4 mm grid width samples, the grid channels of which were blocked. The decrease trend was caused by the decreasing effective heating area. The CHF increased with grid width until 1.1 mm, then slightly decreased when the grid width was greater than 1.1 mm. The maximum CHF on the grid structure surface achieved at the transition point was 303 W/cm(2), which was three times that of the plain surface. The enhancement was attributed to the grid structure's "partition effect" that inhibited Helmholtz instability, confined bubble and hot spot expansion in the near surface region. The results provide important guidance for the design of future 3D structured surfaces for boiling enhancement. SLM technique provides a new and effective way for the manufacturing of innovative structured surfaces with controllable parameters and opens a new direction for boiling heat transfer mechanism research. (C) 2018 Elsevier Ltd. All rights reserved.