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ISSN Online: 2377-424X

ISBN Print: 0-89116-559-2

International Heat Transfer Conference 8
August, 17-22, 1986, San Francisco, USA

ON HEAT FLOW ACROSS CYLINDRICAL JOINTS

Get access (open in a dialog) DOI: 10.1615/IHTC8.310
pages 651-658

Résumé

A theory is presented for the prediction of the thermal contact conductance of concentric cylinders made of similar or dissimilar materials. The joints may be either in vacuum or in a conducting medium. It is shown that the conductance can be expressed as a function of the heat flux. Other parameters which influence the conductance are shown to be: the properties of the solids and the fluid environment, the geomertry of the cylinders, the surface finish and the initial degree of fit.
The results show that the contact pressure and, therefore the conductance increase with heat flux. While the contact pressure is relatively unaffected by the interstitial fluid, the conductance is significantly influenced by the nature of the fluid. The solid material combination is shown to control both the pressure and the conductance considerably - the conductance values, in fact, may be greater for a combination with lower effective thermal conductivity than for a combination with a higher conductivity, depending on the direction of heat flow.