Modeling of film condensation flow in oval microchannels

被引：17
作者：
Wang, Ji [1 ]
Li, Jun Ming [1 ]
Hwang, Yunho [2 ]
机构：
[1] Tsinghua Univ, Dept Energy & Power Engn, Minist Educ, Key Lab Thermal Sci & Power Engn, Beijing 100084, Peoples R China
[2] Univ Maryland, Dept Mech Engn, Ctr Energy Environm Engn, College Pk, MD 20740 USA
来源：
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2018年 / 126卷
基金：
中国国家自然科学基金;
关键词：
Condensation; Microchannel; Theoretical modeling; Refrigerant; Heat transfer; LAMINAR ANNULAR-FLOW; HEAT-TRANSFER; PRESSURE-DROP; STEAM CONDENSATION; MICRO-FINS; MINICHANNELS; TRANSITION; CHANNELS; FLUID; TUBES;
D O I：
10.1016/j.ijheatmasstransfer.2018.05.126
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
A theoretical film condensation heat transfer model was developed for refrigerant flowing through oval shaped microchannels in annular flow regime with laminar liquid film flowing along the channel walls. The model considered the effects of surface tension, disjoining pressure, interfacial shear stress and interfacial thermal resistance. Study was conducted for mass fluxes in a range of 300-1500 kg/(m(2) s) with two refrigerants, R134a and R1234ze(E). The local heat transfer coefficient and circumferential mean heat transfer coefficient along the flow direction were obtained. The liquid film thickness profiles at different locations are presented. Due to the effect of surface tension, the liquid film accumulates towards the semi-circular corner. The circumferential mean heat transfer coefficient is very high after entering the channel inlet, decreases along the flow direction and reaches a constant value. R134a has a slightly higher circumferential mean heat transfer coefficient than that of R1234ze(E) due to its higher liquid conductivity. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1194 / 1205
页数：12
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