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Heat and Mass Transfer

, Volume 43, Issue 1, pp 1–5 | Cite as

Thermal contact conductance of nominaly flat surfaces

  • H. YüncüEmail author
Short Communication

Abstract

The variation of thermal conductance of contact has been investigated as a function of apparent contact pressure experimentally. Experimental data has been obtained for steel, brass, copper and aluminum test pieces having different surface roughness over a wide range of contact pressures. Experimental results are compared with the theoretical predictions of an existing theory. Comparison revealed good agreement of trend with the experimental data, however, numerical values vary widely. Theory can predict the experimental results within an over-all error of less than 35%.

Keywords

Interstitial Fluid Test Piece Heat Flow Rate Thermal Contact Conductance Heat Transfer Mode 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

h

thermal contact conductance

hg

conductance though the interstitial fluid in the gap.

hc

conductance across the contacting solid spots

H

microhardness

k

harmonic mean thermal conductivity of solids

kg

interstitial liquid or gas thermal conductivity

M

gas parameter

m

combined average absolute asperity slope

P

pressure

T

temperature

U

dimensionless conductance across the contacting solid spots

Y

separation distance of contact surface mean planes

α

thermal accommodation coefficient

β

defined by Eq. 8

γ

ratio of specific heats

δ

effective thickness of gap

Λ

mean free path

References

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  1. 1.Mechanical Engineering DepartmentMiddle East Technical UniversityAnkaraTurkey

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