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Research Papers: Micro/Nanoscale Heat Transfer

Simulation of Single Bubble Evaporation in a Microchannel in Zero Gravity With Thermocapillary Effect

[+] Author and Article Information
Wei Li

Fellow ASME
Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China
e-mail: 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

Jingzhi Zhang

School of Energy and Power Engineering,
Shandong University,
Jinan 250061, China

W. J. Minkowycz

Department of Mechanical and
Industrial Engineering,
University of Illinois at Chicago,
Chicago, IL 60607

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 3, 2017; final manuscript received April 27, 2018; published online July 23, 2018. Assoc. Editor: Guihua Tang.

J. Heat Transfer 140(11), 112403 (Jul 23, 2018) (9 pages) Paper No: HT-17-1654; doi: 10.1115/1.4040147 History: Received November 03, 2017; Revised April 27, 2018

This paper presents fundamental research on the hydrodynamics and heat transfer surrounding a single elongated bubble during flow boiling in a circular microchannel. A continuum surface force (CSF) model based on the volume of fluid (VOF) method is combined with the thermocapillary force 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 studied. Results of both test cases show good convergence and agreement with data from the earlier literature. The bubble motion and the local heat transfer coefficient (HTC) on the heated wall with respect to time are discussed. It is found that for large Marangoni number (case 3), variation of surface tension has affected the bubble shape and temperature profile. The thermocapillary effect induces convection in a thin liquid film region, which augments the HTCs at specified positions. The numerical investigation also shows that the average HTC increased by 6.7% in case 3 when compared with case 1. Thus, it is very important to study further the effects of themocapillarity and the Marangoni effect on bubble growth in microchannels.

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Figures

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Fig. 1

Surface tension coefficient versus temperature for R113; the properties of R113 are obtained from the software refprop 9.11

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Fig. 2

Algorithm to solve phase change problem with thermocapillary effect

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Fig. 3

Illustration of tangential and normal components of surface tension force

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Fig. 4

(a) Problem sketch of free surface thermocapillary-driven flows in a cavity and (b) temperature field (solid line) and streamline (dashed line) obtained at the steady-state (d = 0.01). The dimensionless interval between temperature contours is 0.1. The dimensionless interval between streamline contours is 1.6 × 10−3 in both phases.

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Fig. 5

Schematic illustration of: (a) an elongated vapor bubble flowing through the microchannel in saturated liquid with an upstream adiabatic section and downstream heating section and (b) a spherical vapor bubble growing in a microchannel of diameter D = 0.2 mm

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Fig. 6

(a) Bubble nose instantaneous location versus time after entering the heating section and (b) bubble shape and temperature profile of the case with thermocapillary effect at tm; Comparison of HTCs on the heated wall at tm. The results of our simulation are compared with those in the literature [35,36].

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Fig. 7

Bubble interface evolution and temperature distribution of case 1 (top) and case 3 (bottom)

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Fig. 8

(a) Comparison of bubble nose and tail location against time for different Marangoni numbers and (b) dimensionless liquid film thickness (δ/D) and superheat temperature of the heated wall along the axial direction at 6 ms

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Fig. 9

Time evolution of HTC. tin denotes the time instance when the bubble nose enters the position of x/R = 5, 10, and 15.

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Fig. 10

Time evolution of average HTC on the heated wall

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