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Research Papers: Evaporation, Boiling, and Condensation

Flow Patterns During Flow Boiling Instability in Silicon-Based Pin-Fin Microchannels

[+] Author and Article Information
Fayao Xu

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: xufayao@sjtu.edu.cn

Huiying Wu

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: whysrj@sjtu.edu.cn

Zhenyu Liu

School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: zhenyu.liu@sjtu.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 13, 2017; final manuscript received August 17, 2017; published online November 21, 2017. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 140(3), 031501 (Nov 21, 2017) (10 pages) Paper No: HT-17-1212; doi: 10.1115/1.4038194 History: Received April 13, 2017; Revised August 17, 2017

In this paper, the flow patterns during water flow boiling instability in pin-fin microchannels were experimentally studied. Three types of pin-fin arrays (in-line/circular pin-fins, staggered/circular pin-fins, and staggered/square pin-fins) were used in the study. The flow instability started to occur as the outlet water reached the saturation temperature. Before the unstable boiling, a wider range of stable boiling existed in the pin-fin microchannels compared to that in the plain microchannels. Two flow instability modes for the temperature and pressure oscillations, which were long-period/large-amplitude mode and short-period/small-amplitude mode, were identified. The temperature variation during the oscillation period of the long-period/large-amplitude mode can be divided into two stages: increasing stage and decreasing stage. In the increasing stage, bubbly flow, vapor-slug flow, stratified flow, and wispy flow occurred sequentially with time for the in-line pin-fin microchannels; liquid single-phase flow, aforementioned four kinds of two-phase flow patterns, and vapor single-phase flow occurred sequentially with time for the staggered pin-fin microchannel. The flow pattern transitions in the decreasing stage were the inverse of those in the increasing stage for both in-line and staggered pin-fin microchannels. For the short-period/small-amplitude oscillation mode, only the wispy flow occurred. With the increase of heat flux, the wispy flow and the vapor single-phase flow occupied more and more time ratio during an oscillation period in the in-line and staggered pin-fin microchannels.

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Figures

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Fig. 1

Experimental setup

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Fig. 2

Scanning electron microscope image of a pin-fin microchannel

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Fig. 3

Images of pin-fin structures for (a) microchannel #1 with in-line/circular pin-fins, (b) microchannel #2 with staggered/circular pin-fins, and (c) microchannel #3 with staggered/squared pin-fins. The pin-fin pitches are ST = SL = 300 μm, and the diameter or side of the pin-fin is a = 100 μm.

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Fig. 5

Variation of temperatures with increasing heat flux: (a) pin-fin microchannel #1, (b) pin-fin microchannel #2, and (c) pin-fin microchannel #3

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Fig. 6

Two types of instability modes of temperature and pressure oscillations for the pin-fin microchannel #1: (a) long-period/large-amplitude mode and (b) short-period/small-amplitude mode

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Fig. 7

Effect of heat flux on temperature oscillation for the pin-fin microchannel #1 under the long-period/large-amplitude mode

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Fig. 8

Temperature and pressure oscillations for the pin-fin microchannels: (a) #2 and (b) #3

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Fig. 9

Effect of heat flux on temperature oscillation for the pin-fin microchannels: (a) #2 and (b) #3

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Fig. 10

Flow patterns of two-phase flow during the flow boiling instability for the pin-fin microchannels: (a) #1, (b) #2, and (c) #3. The symbols from (i) to (iv) denote bubbly flow, vapor-slug flow, stratified flow, and wispy flow, respectively.

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Fig. 11

Liquid single-phase flow and vapor single-phase flow for the staggered pin-fin microchannels #2 and #3

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Fig. 12

Flow pattern transitions during an oscillation period of the flow boiling instability for the pin-fin microchannels: (a) #1, (b) #2, and (c) #3. The symbols from (i) to (vi) denote bubbly flow, vapor-slug flow, stratified flow, wispy flow, liquid-phase flow, and vapor-phase flow, respectively.

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