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Evaporation, Boiling, and Condensation

Flow-Through Boiling of Isopentane in Structured-Porous Fins: Effects of System Parameters

[+] Author and Article Information
Zenghui Zhao1

Center for Automation Technologies and Systems, Rensselaer Polytechnic Institute, Troy, NY 121280special4work@gmail.com

Richard A. Wirtz

Department of Mechanical Engineering,  University of Nevada-Reno, Reno, NV 89557rawirtz@unr.edu

1

Corresponding author.

J. Heat Transfer 134(7), 071501 (May 18, 2012) (9 pages) doi:10.1115/1.4006164 History: Received February 14, 2011; Revised January 23, 2012; Published May 17, 2012; Online May 18, 2012

Metallic porous structures have proved to be effective in enhancing heat transfer due to the inherent characteristics such as high specific surface area and large pore densities. In this study, structured-porous fins were built from plain weaved copper wire mesh screens. Seven test articles were made, with pore hydraulic diameter varying from 214 μm to 48 μm. Boiling experiments were conducted with Isopentane, a highly wetting fluid, flowing through the porous fin. The tested system pressure varies from 2 bars to 5 bars, and the channel Reynolds number from 2000 to 10,000. Influences of system pressure, flow rate, and pore sizes (mesh number) on flow boiling performance were investigated. The mechanisms for the influences were discussed.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 9

Constructed boiling curves

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Figure 10

Boiling performance ranking of different test articles

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Figure 8

Boiling performance comparisons (a) minimum superficial velocity and (b) maximum superficial velocity

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Figure 7

Flow rate effect on boiling performance (a) M50; (b) M80; (c) M145; and (d) M200

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Figure 6

Pressure effect on boiling performance (a) M80; (b) M100; (c) M145; and (d) M200 (new)

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Figure 5

Sketch of data reduction scheme

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Figure 4

Sketch of a test article

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Figure 3

Exploded view of the test article assembly

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Figure 2

Section view of test channel

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Figure 1

Flow chart of the experimental system

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