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Research Papers: Evaporation, Boiling, and Condensation

Correlation of Subatmospheric Pressure, Saturated, Pool Boiling of Water on a Structured-Porous Surface

[+] Author and Article Information
Sean J. Penley

Department of Mechanical Engineering, University of Nevada, Reno, Reno, NV 89557seanpenley@gmail.com

R. A. Wirtz

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

J. Heat Transfer 133(4), 041501 (Jan 06, 2011) (11 pages) doi:10.1115/1.4001628 History: Received September 13, 2009; Revised March 24, 2010; Published January 06, 2011; Online January 06, 2011

Saturated pool-boiling experiments at 1 atm and subatmospheric pressure assess the utility of fine-filament screen-laminate enhanced surfaces as effective bubble nucleation sites. Experiments were conducted on vertically oriented, multilayer laminates in saturated distilled water at pressures of 0.2–1.0 atm. The performance of 12 different copper-filament surfaces, having pore hydraulic diameters ranging from 14μm to 172μm, is documented. Experimental results show that boiling performance is a strong function of screen-laminate geometry. In the present work, enhancement of up to 27 times that of an unenhanced surface was obtained at a superheat of 8 K and a pressure of 0.2 atm. Dimensional analysis and multiparameter regression are used to develop a heat transfer correlation that relates the boiling heat transfer coefficient to the lamination geometry.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

80 mesh after cold rolling (above) and cross section of diffusion bonded 80M2N-43 lamination (below)

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Figure 2

Test article components

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Figure 4

Boiling performance of 145M8N-43 versus unenhanced surface at Psat=1 atm

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Figure 5

Pool boiling images at 0.2 atm. Unenhanced surface (n=7, left), 145M8N-43 surface (n=121, right). q″=20 W/cm2.

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Figure 6

Boiling performance of 200M8N-43 at various pressures

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Figure 7

Boiling performance at 1 atm of eight-layer screen laminates having mesh numbers 50, 80, 145, and 200

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Figure 8

Boiling performance at 0.2 atm of eight-layer screen laminates with mesh numbers 50, 80, 145, and 200

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Figure 9

0.2 atm boiling performance of 145 mesh laminates with 4, 8, and 12 layers

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Figure 10

1 atm comparison of vertical 145M8N-43 in this work versus horizontal 145M-8 of Li and Peterson (21)

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Figure 11

Boiling heat transfer coefficient of surface enhancements in the literature

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Figure 12

Nucleation sites at 1 atm for enhanced surfaces. q″≈20 W/cm2

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Figure 13

Nucleation sites at 0.2 atm for enhanced surfaces. q″≈20 W/cm2

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Figure 14

Relationship of ONB with pore hydraulic diameter and pressure

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Figure 15

Correlation of Nusselt number

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Figure 16

Correlations in the literature versus 145M8N-43, Psat=1.0 atm

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Figure 17

Correlations in the literature versus 145M8N-43, Psat=0.2 atm

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Figure 18

Use of Eq. 11 to predict Li and Peterson (21)

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