Experimental Study on Flow Boiling of Deionized Water in a Horizontal Long Small Channel
Experimental Study on Flow Boiling of Deionized Water in a Horizontal Long Small Channel作者机构：Institute of Thermal Engineering School of Mechanical Electronic and Control Engineering Beijing Jiaotong University Beijing 100044 China Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale Beijing 100044 China
出 版 物：《Journal of Thermal Science》 (热科学学报（英文版）)
年 卷 期：2018年第27卷第2期
页 面：157-166页
核心收录：
学科分类：080701[工学-工程热物理] 08[工学] 0807[工学-动力工程及工程热物理]
基 金：supported by National Natural Science Foundation of China(No.51376019)
主 题：Flow boiling Long mini-channel Visualization Evaporator Heat transfer coefficient
摘 要：In this paper,an experimental investigation on the flow boiling heat transfer in a horizontal long mini-channel was carried out. The mini-channel was with 2 mm wide and 1 mm deep and 900 mm long. The material of the mini-channel was stainless. The working fluid was deionized water. The experiments were conducted with the conditions of inlet pressure in the range of 0.2~0.5 MPa, mass flux in the range of 196.57-548.96 kg/m2 s, and the outlet vapor quality in the range of 0.2 to 1. The heat flux was in the range of 292.86 kW/m2 to 788.48 kW/m2,respectively. The influences of mass flux and heat flux were studied. At a certain mass flow rate, the local heat transfer coefficient increased with the increase of the heat flux. If dry-out occurred in the mini-channel, the heat transfer coefficient decreased. At the same heat flux, the local heat transfer coefficient would depend on the mass flux. It would increase with the mass flux in a certain range,and then decrease if the mass flux was beyond this range. Experimental data were compared with the results of previous studies. Flow visualization and measurements were conducted to identify flow regime transitions. Results showed that there were eight different kinds of flow patterns occurring during the flow boiling. It was found that flow pattern had a significant effect on heat transfer.
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