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research-article

Heat transfer characteristics and flow pattern visualization for flow boiling in a vertical narrow microchannel

[+] Author and Article Information
Kan Zhou

Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
bigxanxus@qq.com

Zhu Hua

Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
zhuhua@zju.edu.cn

Wei Li

Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
weili96@zju.edu.cn

Junye Li

Department of Energy Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China; Co-Innovation Center for Advanced Aero-Engine, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
lijunye@zju.edu.cn

Sheng Kuang

College of Electrical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
shengk@zju.edu.cn

Shao Shuai

College of Electrical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou, 310027, China
shaos@zju.edu.cn

Haiwang Li

School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics (BUAA), 37 Xueyuan Road, Beiing, 100191, China
19820912@sina.com

Zhi Tao

School of Energy and Power Engineering, Beijing University of Aeronautics and Astronautics (BUAA), 37 Xueyuan Road, Beiing, 100191, China; National Key Lab. on Aero-Engines, School of Jet P, Beijing University of Aeronautics and Astronautics (BUAA), 37 Xueyuan Road, Beiing, 100191, China
tao_zhi@buaa.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4043476 History: Received October 24, 2018; Revised April 11, 2019

Abstract

Recently microchannel heat sinks have been emerged as a kind of high performance cooling scheme to meet the heat dissipation requirement of electronics packaging and integration. In the present study an experimental investigation of subcooled flow boiling in a high-aspect-ratio rectangular microchannel was conducted with deionized water as the working fluid. In the experimental operations, the mass flux was varied from 200 to 400 kg/m2s and imposed heat flux from 3 to 20 W/cm2 while the fluid inlet temperature was regulated constantly at 90 ?. The boiling curves, onset of nucleate boiling (ONB) and flow patterns of subcooled flow boiling were investigated with the aid of instrumental measurements and a high speed camera. The slope of the boiling curves increased sharply once the superheat needed to initiate the onset of nucleate boiling was attained, with lower superheat required of boiling incipience for lower mass fluxes. Meanwhile the initiative superheat and heat flux of onset of nucleate boiling were compared with existing correlations in the literature with good agreement. As for the flow visualization images, slug flow and reverse backflow were observed, where transient local dryout as well as rewetting occurred. A facile Image Processing Tool was developed to profile the transient development and progression of the liquid-vapor interface and partial dryout patches in microchannels, which proved that the physical quantities of bubble dynamics for the elongation period during subcooled boiling could be well detected and calculated.

Copyright (c) 2019 by ASME
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