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research-article

Simulation of Single Bubble Evaporation in Microchannel in Zero Gravity with Thermocapillary Effect

[+] Author and Article Information
Wei Li

Fellow ASME, Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China
weili96@zju.edu.cn

Yang Luo

Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China; Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-Engine, Zhejiang University, Hangzhou 310027, China
zjuluoyang@zju.edu.cn

Jing-zhi Zhang

School of Energy and Power Engineering, Shandong University, Jinan 250061, China
zjzsdu@163.com

W. J. Minkowycz

Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, Chicago, IL 60607, USA
wjm@uic.edu

1Corresponding author.

ASME doi:10.1115/1.4040147 History: Received November 03, 2017; Revised April 27, 2018

Abstract

This paper presents a fundamental research on hydrodynamics and heat transfer about an elongated bubble flow boiling in a circular microchannel. In present study, continuum Surface Force (CSF) model based on Volume of Fluid (VOF) methodis combined withthermocapillaryforce to explore the effects of thermocapillarity for flow boiling in microchannels. To validate the self-defined codes, a two-phase thermocapillary-driven flow and a Taylor bubble growing in a capillary tube are performed. Results of both test cases show good convergence and are in good agreement with data from other literatures. Bubble motion and local heat transfer coefficient (HTC) on the heated wall with respect to time are discussed in present study. It is found that for large Marangoni number (case 3), variation of surface tension has an influenceon bubble shape and temperature profile. Thermocapillary effect induces convection in liquid film region, which augments the HTCs at specified positions. The numerical investigation also shows that average HTC has increased by 6.7% in case 3 when compared with case 1. Thus, it is very significative to further study the influence of themocapillarity and Marangoni effect on bubble growth in microchannels.

Copyright (c) 2018 by ASME
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