Enhanced heat transfer via boiling in a porous layer covering the heated surface is considered analytically. The effect of vapor channels traversing the porous layer on the power for which a vapor film on the heated surface occurs, is examined by comparing the heat removal capability of the system with and without channels. A significant increase of the attained coolability level is obtained theoretically leading to the possibility of new design configurations for the cooling of intensely heated surfaces.

Issue Section:
Technical Briefs
Keywords:
Boiling, Cooling, Enhancement, Heat Transfer, Porous Media
Topics:
Boiling, Cooling, Heat transfer, Vapors
1.
Abou-Zyan, H. Z., and Plumb, O. A., 1997, “Boiling on horizontal surfaces coated with porous metal wicks,” HTD-Vol. 349, National Heat Transfer Conference, Vol. 11, ASME, New York.
2.
Andrianov
A. B.
,
Zuev
A. V.
,
Levitan
L. L.
,
Malyshenko
S. P.
, and
Orlova
I. A.
,
1994
, “
Hydraulic resistance of two-phase flow in pipes with porous coating
,”
High Temperature
, Vol.
32
, No.
1
, pp.
91
–
96
.
3.
Bird, R. B., Stewart, W. E., and Lightfoot, E. N., 1960, Transport Phenomena, John Wiley and Sons, New York.
4.
Fand
R. M.
,
Kim
B. Y. K.
,
Lam
A. C. C.
, and
Phan
R. T.
,
1987
, “
Resistance to the flow of fluids through simple and complex porous media whose matrices are composed of randomly packed spheres
,”
J. Fluids Engineering
, Vol.
109
, p.
268
268
.
5.
Incropera
F. P.
,
1988
, “
Convection Heat Transfer in Electronic Equipment Cooling
,”
ASME JOURNAL OF HEAT TRANSFER
, Vol.
110
,
1097
–
1111
.
6.
Khrustalev
D.
, and
Faghri
A.
,
1995
, “
Heat transfer in the inverted meniscus type evaporator at high heat fluxes
,”
Int. J. Heat Mass Transfer
, Vol.
38
,
3091
–
3101
.
7.
Konstantinou
N. D.
,
Stubos
A. K.
,
Statharas
J. C.
,
Kanellopoulos
N. K.
, and
Papaioannou
A.
,
1997
, “
Enhanced Boiling Heat Transfer in Porous Layers With Application in Electronic Component Cooling
,”
Journal of Enhanced Heat Transfer
, Vol.
4
, pp.
175
–
186
.
8.
Lipinski
R. J.
,
1984
, “
A coolability model for post accident nuclear reactor debris
,”
Nuclear Technology
, Vol.
65
, pp.
53
–
66
.
9.
Mughal
M. P.
, and
Plumb
O. A.
,
1996
, “
An experimental study of boiling on a wicked surface
,”
Int. J. Heat Mass Transfer
, Vol.
39
, pp.
771
–
777
.
10.
Nakayama, W., 1991, “Porous surface boiling and its application to cooling of microelectronic chips,” Convective Heat and Mass Transfer in Porous Media, S. Kakac et at, eds., Kluwer Academic Publishers, Dordrecht, The Netherlands, pp. 1007–1030.
11.
Stubos, A. K., 1990, “Boiling and dryout in unconsolidated particle beds,” Ph.d. Thesis, Univ. Libre de Bruxelles, von Karman Institute.
12.
Stubos
A. K.
, and
Buchlin
J.-M.
,
1994
, “
Vapour Channels in Boiling, Uncon-stricted Particle Beds—Effect on the Dryout Heat Flux
,”
Int. J. Multiphase Flow
, Vol.
20
, pp.
131
–
152
.
13.
Thome, J. R., 1990, Enhanced Boiling Heat Transfer, Hemisphere, Washington, DC.
14.
Udell
K. S.
,
1985
, “
Heat transfer in porous media considering phase change and capillarity—The heat pipe effect
,”
Int. J. Heat Mass Transfer
, Vol.
28
, pp.
485
–
495
.
15.
Wang
C. W.
, and
Beckermann
C.
,
1992
, “
A two-phase mixture model of liquid-gas flow and heat transfer in capillary porous media, Part II: Application to pressure driven boiling flow adjacent to a vertical heated plate
,”
Int. J. Heat Mass Transfer
, Vol.
36
, pp.
2759
–
2768
.
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