Interference-fit finned tubes depend for their heat-transfer capability upon a contact pressure between fin and tube. The bond resistance under such conditions is relatively small compared to the other resistances in the heat-flow path. At elevated temperatures, however, differential thermal expansion between fins and tubes completely relaxes the contact pressure and introduces an additional gap resistance; this may become a significant part of the total resistance to heat transfer. A theoretical method for predicting the gap resistance is derived in terms of the fin and tube dimensions, their physical properties, the fluid temperatures and heat-transfer coefficients, and the initial contact pressure. Test data on five finned-tube units representing embedded, tension-wound, and muff-type fins are given in graphical and tabular form. Very good agreement is found between theory and test in two of the interference-fit units. The other two show only fair agreement.
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Research Papers
Thermal-Contact Resistance in Finned Tubing
Karl A. Gardner,
Karl A. Gardner
The Griscom-Russell Company
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T. C. Carnavos
T. C. Carnavos
Research-Test Department, The Griscom-Russell Company, Massillon, Ohio
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Karl A. Gardner
The Griscom-Russell Company
T. C. Carnavos
Research-Test Department, The Griscom-Russell Company, Massillon, Ohio
J. Heat Transfer. Nov 1960, 82(4): 279-290 (12 pages)
Published Online: November 1, 1960
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Received:
August 17, 1959
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Gardner, K. A., and Carnavos, T. C. (November 1, 1960). "Thermal-Contact Resistance in Finned Tubing." ASME. J. Heat Transfer. November 1960; 82(4): 279–290. https://doi.org/10.1115/1.3679932
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