Pool nucleate boiling heat transfer experiments from coated surfaces with porous copper (Cu) and molybdenum (Mo) and spirally wrapped with helical wire on copper surfaces with micro-roughness immersed in saturated R-134a and R-600a were conducted. The influence of coating thickness, porosity, wrapped helical angle, and wire pitch on heat transfer and boiling characteristics including bubble parameters were studied. The enhanced surface heat transfer coefficients with R-600a as refrigerant found are 2.4 times higher than those of the smooth surfaces. Photographs indicate that the average number of bubbles and bubble departure diameters has been found to increase linearly with heat flux, while the bubble diameters exhibit opposite trend in both refrigerants. Furthermore, the heat transfer of the boiling process for the present enhanced geometry (coated and wrapped) was modeled and analyzed. The experimental data for plasma coating and spirally wrapped surfaces were correlated in terms of relevant parameters, respectively to provide a thermal design basis for engineering applications.

Issue Section:
Boiling and Condensation
Keywords:
boiling, heat transfer, refrigeration, nucleation, bubbles, two-phase flow
Topics:
Boiling, Bubbles, Heat flux, Heat transfer, Wire, Coatings, Refrigerants, Plasmas (Ionized gases), Nucleate pool boiling, Nucleation (Physics), Fluids, Temperature
1.
Thome, J. R., 1990, Enhanced Boiling Heat Transfer, Hemisphere, New York, pp. 28–63.
2.
Hsieh
,
S.-S.
and
Weng
,
C.-J.
,
1997
, “
Nucleate Pool Boiling from Coated Surfaces in Saturated R-134a and R-407c
,”
Int. J. Heat Mass Transf.
40
,
519
–
532
.
3.
Hsieh
,
S.-S.
,
Weng
,
C.-J.
, and
Chiou
,
J.-J.
,
1999
“
Nucelate Pool Boiling on Ribbed Surfaces with Micro-Roughness at Low and Moderate Heat Flux
,”
ASME J. Heat Transfer
121
,
376
–
385
.
4.
Kline
,
S. J.
and
McClintock
,
F. A.
,
1953
, “
Describing Uncertainties in Single Sample Experiments
,”
Mech. Eng. (Am. Soc. Mech. Eng.)
75
,
3
–
8
.
5.
Junkhan
,
C. H.
and
Bergles
,
A. E.
,
1976
, “
Heat Transfer Laborating Data Acquisition System
,”
Heat Transfer Laboratory Report
HTL-12, ISU-ERI-Ames-77178, Iowa State University, Ames, IA.
6.
Carey, V. P. 1992, Liquid-Vapor Phase Change Phenomena, Hemisphere, Washington D.C., p. 233.
7.
Marto
,
P. J.
,
Monlson
,
J. A.
, and
Maynard
,
M. D.
,
1966
, “
Nucleate Pool Boiling of Nitrogen with Different Surface Conditions
,”
ASME J. Heat Transfer
90
,
437
–
444
.
8.
Stephan
,
K.
and
Abdelsalam
,
M.
,
1980
, “
Heat Transfer Correlation for Natural Convection Boiling
,”
Int. J. Heat Mass Transf.
23
,
73
–
87
.
9.
Rudemiller, G. R., and Lindsay, J. D., 1990, “An Investigation of Boiling Heat Transfer in Fibrous Porous Media,” Proceedings of the Ninth International Heat Transfer Conference, 5, pp. 159–164.
10.
Ammerman
,
C. N.
,
You
,
S. M.
, and
Hong
,
Y. S.
,
1996
, “
Identifciation of Pool Boiling Heat Transfer Mechanisms from a Wire Immersed in Saturated FC-72 Using a Single-Photo/LDA Method
,”
ASME J. Heat Transfer
118
,
117
–
123
.
11.
Zuber
,
N.
,
1963
, “
Nucleate Boiling: The Region of Isolated Bubble and the Similarity With Natural Convection
,”
Int. J. Heat Mass Transf.
6
,
53
–
78
.
12.
Bergles
,
A. E.
and
Chyu
,
M. C.
,
1982
, “
Characeristic of Nucleate Pool Boiling From Porous Metallic Coatings
,”
ASME J. Heat Transfer
104
,
279
–
285
.
Copyright © 2001
 by ASME
You do not currently have access to this content.