Thermal contact conductance is an important consideration in such applications as nuclear reactor cooling, electronics packaging, spacecraft thermal control, and gas turbine and internal combustion engine cooling. In many instances, the highest possible thermal contact conductance is desired. For this reason, soft, high conductivity, metallic coatings are sometimes applied to contacting surfaces (often metallic) to increase thermal contact conductance. O’Callaghan et al. (1981) as well as Antonetti and Yovanovich (1985, 1988) developed theoretical models for thermal contact conductance of metallic coated metals, both of which have proven accurate for flat, rough surfaces. However, these theories often substantially overpredict the conductance of non-flat, rough, metallic coated metals. In the present investigation, a semi-empirical model for flat and non-flat, rough, uncoated metals, previously developed by Lambert and Fletcher (1996), is employed in predicting the conductance of flat and non-flat, rough, metallic coated metals. The models of Antonetti and Yovanovich (1985, 1988) and Lambert and Fletcher (1996) are compared to experimental data from a number of investigations in the literature. This entailed analyzing the results for a number of metallic coating/substrate combinations on surfaces with widely varying flatness and roughness. Both models agree well with experimental results for flat, rough, metallic coated metals. However, the semi-empirical model by Lambert and Fletcher (1996) is more conservative than the theoretical model by Antonetti and Yovanovich (1985, 1988) when compared to the majority of experimental results for non-flat, rough, metallic coated metals.

1.
Lambert
,
M. A.
, and
Fletcher
,
L. S.
,
1993
, “
A Review of the Thermal Contact Conductance of Junctions with Metallic Coatings and Films,” AIAA Paper No. 92-0709
,
AIAA Journal of Thermophysics and Heat Transfer
,
7
(
4
), pp.
547
554
.
2.
O’Callaghan, P. W., Snaith, B., Probert, S. D., and Al-Astrabadi, F. R., 1981, “Prediction of Optimum Interfacial Filler Thickness for Minimum Thermal Contact Resistance,” AIAA Paper 81–1166.
3.
Antonetti
,
V. W.
, and
Yovanovich
,
M. M.
,
1985
, “
Enhancement of Thermal Contact Conductance by Metallic Coatings: Theory and Experiment
,”
ASME Journal of Heat Transfer
,
107
, pp.
513
519
.
4.
Antonetti
,
V. W.
, and
Yovanovich
,
M. M.
,
1988
, “
Using Metallic Coatings to Enhance Thermal Contact Conductance of Electronic Packages
,”
Heat Transfer Eng.
,
9
(
3
), pp.
85
92
.
5.
Hegazy, A. A., 1985, “Thermal Joint Conductance of Conforming Rough Surfaces,” Ph.D. dissertation, University of Waterloo, Waterloo, Ontario, Canada.
6.
Clausing
,
A. M.
, and
Chao
,
B. T.
,
1965
, “
Thermal Contact Resistance in a Vacuum Environment
,”
ASME J. Heat Transfer
,
87
(
3
), pp.
243
251
.
7.
Mikic, B. B., and Rohsenow, W. M., 1966, “Thermal Contact Conductance,” Technical Report No. 4542-41, Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Mass., NASA Contract No. NGR 22-009-065.
8.
Nishino, K., Yamashita, S., and Torii, K., 1993, “Thermal Contact Conductance Under Low Applied Load in a Vacuum Environment,” Proceedings of the First International Conference of Aerospace Heat Exchanger Technology, R. K. Shah and A. Hashemi, eds., Palo Alto, California, February 15–17, Elsevier, Amsterdam, pp. 763–788.
9.
Mikic
,
B. B.
,
1970
, “
Thermal Constriction Resistance Due to Non-Uniform Surface Conditions; Contact Resistance at Non-Uniform Interface Pressure
,”
Int. J. Heat Mass Transf.
,
13
, pp.
1497
1500
.
10.
Greenwood
,
J. A.
, and
Tripp
,
J. H.
,
1967
, “
The Elastic Contact of Rough Spheres
,”
ASME J. Appl. Mech.
,
89
(
1
), pp.
153
159
.
11.
Hertz, H. R., 1896, Miscellaneous Papers, English Translation, MacMillan and Co., London.
12.
Sasajima
,
K.
, and
Tsukada
,
T.
,
1981
, “
On the Approach Between a Sphere and a Rough Surface (2nd Report-Critical Condition to Yield Plastic Deformation in Contacting Bodies,” (in Japanese
),
Journal of the Japanese Society of Precision Engineering
,
47
(
6
), pp.
694
699
.
13.
Tsukada
,
T.
, and
Anno
,
Y.
,
1979
, “
On the Approach Between a Sphere and a Rough Surface (1st Report, Analysis of Contact Radius and Interface Pressure),” (in Japanese
),
Journal of the Japanese Society of Precision Engineering
,
45
(
4
), pp.
473
479
.
14.
Lambert, M. A., 1995, “Thermal Contact Conductance of Spherical, Rough Metals,” Ph.D. dissertation, Texas A&M University, College Station, TX.
15.
Yovanovich, M. M., Burde, S. S., and Thompson, J. C., 1977, “Thermal Constriction Resistance of Arbitrary Planar Contacts with Constant Heat Flux,” AIAA Paper No. 76–440.
16.
Antonetti, V. W., 1983, “On the Use of Metallic Coatings to Enhance Thermal Contact Conductance,” Ph.D. dissertation, University of Waterloo, Waterloo, Ontario, Canada.
17.
Lambert, M. A., and Fletcher, L. S., 1996, “Thermal Contact Conductance of Spherical, Rough Metals,” AIChE National Heat Transfer Conference, Houston, TX.
18.
Fried, E., 1966, “Study of Interface Thermal Contact Conductance, Summary Report,” General Electric Company Document No. 66SD4471, Valley Forge, PA.
19.
Mal’kov
,
V. A.
, and
Dobashin
,
P. A.
,
1969
, “
The Effect of Soft-Metal Coatings and Linings on Contact Thermal Resistance
,”
Inzh.-Fiz. Zh.
,
17
(
5
), pp.
871
879
.
20.
Kang, T. K., Peterson, G. P., and Fletcher, L. S., 1989, “Enhancing the Thermal Contact Conductance Through the Use of Thin Metallic Coatings,” ASME Paper No. 89-HT-23.
21.
Chung, K. C., Sheffield, J. W., and Sauer, Jr., M. J., 1990, “Effect of Metallic Coated Surfaces on Thermal Contact Conductance: An Experimental Study,” 6th Miami International Symposium on Heat and Mass Transfer, Miami Beach, FL.
22.
Sheffield, J. W., Williams, A., Sauer, H. J., Jr., O’Keefe, T. J., and Chung, K. C., 1992, “Enhancement of Thermal Contact Conductance by Transitional Buffering Interfaces (TBI),” National Science Foundation Final Project Rep., NSF Grant No. CTS-8901871 (Thermal Systems Program), University of Missouri, Rolla, MO.
23.
Lambert, M. A., and Fletcher, L. S., 1995, “An Experimental Investigation of the Thermal Contact Conductance of Electroplated Silver Coatings,” AIAA Paper No. 93-0846.
You do not currently have access to this content.