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Research Papers: Two-Phase Flow and Heat Transfer

Heat Transfer and Fluid Flow Characteristics of Nonboiling Two-Phase Flow in Microchannels

[+] Author and Article Information
Kyosung Choo

 School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Koreasungjinkim@kaist.ac.kr

Sung Jin Kim1

 School of Mechanical, Aerospace & Systems Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Koreasungjinkim@kaist.ac.kr

1

Corresponding author.

J. Heat Transfer 133(10), 102901 (Aug 15, 2011) (7 pages) doi:10.1115/1.4004208 History: Received September 06, 2010; Revised May 10, 2011; Published August 15, 2011; Online August 15, 2011

In this study, heat transfer and fluid flow characteristics of nonboiling two-phase flow in microchannels were experimentally investigated. The effects of channel diameter (140, 222, 334, and 506 μm) on the Nusselt number and the pressure drop were considered. Air and water were used as the test fluids. Results were presented for the Nusselt number and the pressure drop over a wide range of gas superficial velocity (1.24–40.1 m/s), liquid superficial velocity (0.57–2.13 m/s), and wall heat flux (0.34–0.95 MW/m2 ). The results showed that the Nusselt number increased with increasing gas flow rate for the large channels of 506 and 334 μm, while the Nusselt number decreased with increasing gas flow for the small channels of 222 and 140 μm. Based on these experimental results, a new correlation for the forced convection Nusselt number was developed. In addition, the two-phase friction multiplier is shown to decrease as channel diameter decreases due to the influence of viscous and surface tension forces.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of experimental setup

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Figure 2

Single-phase flow validation

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Figure 3

Bulk, outer wall, and inner wall temperature

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Figure 4

Friction factor compared theoretical laminar flow values

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Figure 5

Pressure drop characteristics of two-phase flow: (a) variation of the two-phase friction multiplier with the Lockhart–Martinelli parameter; (b) comparison between the correlation by Mishima and Hibiki [18] and the present experimental results

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Figure 6

Two-phase Nusselt numbers for each microchannel

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Figure 7

Two-phase flow patterns within 506 μm channel for ReL  = 420: (a) ReG  = 57; (b) ReG  = 197; and (c) ReG  = 370

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Figure 8

Two-phase flow patterns within 303 μm channel for ReL  = 420: (a) ReG  = 49; (b) ReG  = 176; and (c) ReG  = 354

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Figure 9

Two-phase flow patterns within 190 μm channel for ReL  = 420: (a) ReG  = 71; (b) ReG  = 152; and (c) ReG  = 333

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Figure 10

Two-phase flow patterns within 145 μm channel for ReL  = 420: (a) ReG  = 98; (b) ReG  = 144; and (c) ReG  = 321

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Figure 11

Variation in Nusselt number with channel diameter, showing the transition diameter

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Figure 12

Variation in Nusselt number with liquid flow rate at a fixed gas flow rate

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Figure 13

Comparison between the Nusselt number obtained from the correlation of Eq. 15 and that from experimental results

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