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RESEARCH PAPERS: Evaporation, Boiling, and Condensation

Boiling Performance of Single-Layered Enhanced Structures

[+] Author and Article Information
Camil-Daniel Ghiu

G. W. Woodruff School of Mechanical Engineering,   Georgia Institute of Technology, Atlanta, Georgia 30332

Yogendra K. Joshi

G. W. Woodruff School of Mechanical Engineering,   Georgia Institute of Technology, Atlanta, Georgia 30332yogendra.joshi@me.gatech.edu

J. Heat Transfer 127(7), 675-683 (Feb 02, 2005) (9 pages) doi:10.1115/1.1924568 History: Received May 04, 2004; Revised February 02, 2005

A study of pool boiling at atmospheric pressure from single-layered enhanced structures was conducted for a dielectric fluorocarbon liquid (PF 5060). The parameters investigated in this study were: (a) Heat flux (145Wcm2); (b) width of the microchannels (65105μm); and (c) microchannel pitch (0.20.7mm). The boiling performance of the enhanced structures was found to increase with the increase in channel width and decrease in channel pitch. A simple single line curve fit is provided as a practical way of predicting the data over the entire nucleate boiling regime. The exponent n in the single line power curve fit was found to be between 1 and 2. The modes of boiling from an enhanced structure proposed by previous researchers were unable to explain the boiling curves obtained in this study. The present data are explained in light of the contribution from the top finned surface of the enhanced structure.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

Enhanced structures used in this study. (a) Sketch illustrating microchannels on the top and bottom faces. (b) Pore formation at the intersection of microchannels. Top view of structure C-0.360-0.7 is shown. (c) Magnified (50X) pictures of the structure C-0.065-0.7. (c1) Lateral view. (c2) Top view.

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Figure 2

Schematic of the thermosyphon loop

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Figure 3

Boiling curves at saturation for various channel widths

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Figure 4

Boiling curves based on total surface area

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Figure 5

Boiling performance of structure C-0.105-0.5 compared with existing data

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Figure 6

Effect of channel pitch on boiling heat transfer (Wt=65μm)

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Figure 7

Effect of channel pitch on boiling heat transfer (Wt=105μm)

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Figure 8

Hysteresis of boiling curves for different channel widths. The solid symbols correspond to increasing heat fluxes and open symbols to decreasing heat fluxes

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Figure 9

Hysteresis effect for structure C-0.105-0.35

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