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Research Papers

Characteristics of Pool Boiling Bubble Dynamics in Bead Packed Porous Structures

[+] Author and Article Information
Calvin H. Li, Ting Li, Paul Hodgins

Department of Mechanical, Industrial, and Manufacturing Engineering, University of Toledo, Toledo, OH 43606

G. P. Peterson

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

J. Heat Transfer 133(3), 031004 (Nov 15, 2010) (10 pages) doi:10.1115/1.4000952 History: Received February 08, 2009; Revised December 12, 2009; Published November 15, 2010; Online November 15, 2010

Spherical glass and copper beads have been used to create bead packed porous structures for an investigation of two-phase heat transfer bubble dynamics under geometric constraints. The results demonstrated a variety of bubble dynamics characteristics under a range of heating conditions. The bubble generation, growth, and detachment during the nucleate pool boiling heat transfer have been filmed, the heating surface temperatures and heat flux were recorded, and theoretical models have been employed to study bubble dynamic characteristics. Computer simulation results were combined with experimental observations to clarify the details of the vapor bubble growth process and the liquid water replenishing the inside of the porous structures. This investigation has clearly shown, with both experimental and computer simulation evidence, that the millimeter scale bead packed porous structures could greatly influence pool boiling heat transfer by forcing a single bubble to depart at a smaller size, as compared with that in a plain surface situation at low heat flux situations, and could trigger the earlier occurrence of critical heat flux by trapping the vapor into interstitial space and forming a vapor column net at high heat flux situations. The results also proved data for further development of theoretical models of pool boiling heat transfer in bead packed porous structures.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Sketch of experimental setup

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Figure 2

Bottom view of the thermocouple distribution and geometrical dimensions (in millimeters) of the copper plate

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Figure 3

Bubble dynamics and phase change nucleate pool boiling on a plain surface

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Figure 4

Heat flux versus superheat on the heating surface of saturated water nucleate pool boiling on a plain surface

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Figure 5

Single bubble growth, elongation, truncation, and departure cycle in 3 mm diameter glass bead staggered porous structures

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Figure 6

Vapor columns net formation in 3 mm diameter glass bead packed porous structure

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Figure 7

Strong vapor columns forming across several 3 mm diameter glass bead layers above the heating surface

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Figure 8

Phase change images in 3 mm diameter copper bead packed porous structures

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Figure 9

Heat flux versus superheat for 1 mm and 3 mm diameter glass bead packed structure tests with reference to a plain surface test

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Figure 10

Heat flux versus superheat of the heating surface of three nucleate pool boiling structures

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Figure 11

Experimental results for large spheres (28)

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Figure 12

Meshes of 2D and 3D simulation domains

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Figure 13

Phase contour comparison—single bubble growth process under geometric constraint of solid beads (in the simulation, red is the vapor phase, blue is the liquid phase, and white is the solid bead)

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Figure 14

Retracting movement of connecting parts of two sections after breaking. Left image is velocity contour and right image is phase contour (scale bar is velocity index).

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Figure 15

Vector contour comparison with simulation results

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Figure 16

Phase contour of vapor behavior at medium heat flux and liquid water replenishing streaklines (red arrows)

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Figure 17

Vapor column behavior at high heat flux

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