Heat transfer of micro-droplet during free fall in drop tube  

作　　者：LI Ming Xing WANG HaiPeng YAN Na WEI BingBo 

机构地区：[1]Department of Applied Physics, Northwestern Polytechnical University

出　　处：《Science China(Technological Sciences)》2018年第7期1021-1030,共10页中国科学（技术科学英文版）

基　　金：supported by National Natural Science Foundation of China(Grant Nos.51327901,51474175,51522102 and 51734008)

摘　　要：To explore the heat transfer of micro-droplet during free fall in the drop tube, the falling velocity and microgravity level are calculated. The Newtonian heat transfer formulation is coupled with the classical heat conduction equation to predict the heat transfer process within micro-droplet. Based on the numerical solution by finite difference method with implicit Euler scheme,the temporal evolution of thermal information inside micro-droplet is obtained including the temperature distribution, cooling rate, temperature difference and gradient. To quantitatively reveal the mechanism how the various factors affect the heat transfer of micro-droplet, the effects of physical properties of liquid metal and cooling gas as well as the micro-droplet size are studied.As the important indicators of heat transfer process, the cooling rate and temperature difference are acquired to systematically investigate the relationship between thermophysical properties and heat transfer process of different metallic micro-droplets.

关 键 词：cooling rate heat transfer microgravity level drop tube 

分 类 号：TK124[动力工程及工程热物理—工程热物理]