New Models and Methodology for Predicting Thermal Contact Resistance in Compound Cylinders and Finned Tubes
- 1 January 1987
- journal article
- research article
- Published by Taylor & Francis in Heat Transfer Engineering
- Vol. 8 (2) , 35-48
- https://doi.org/10.1080/01457638708962792
Abstract
New thermal conductance correlations based on improved metal, gap. and joint contact models are presented for determining the thermal inlerfacial resistance in compound cylinders. The new theory utilizes models involving measured surface parameters, material hardness, thermophysical properties, and ileratively evaluated contact stresses. The predictions of previous and proposed models are compared to recently published experimental investigations on compound cylinders. Accuracy to within 5% of experimental data is obtained by means of the proposed models. It was found that the alternative models grossly overestimated the thermal contact resistance in compound cylinders, with error ranges from 25 to 100% (Ross and Stoute, Shlykov and Ganin) and 100 to 200% (Veziroglu) of the experimental results. The experimental verifications thereby support the new models in the analysis of compound cylinders, with direct applications in analyzing the performance of finned-tube heal exchangers.Keywords
This publication has 2 references indexed in Scilit:
- Thermal resistance of metallic contactsInternational Journal of Heat and Mass Transfer, 1964
- Thermal-Contact Resistance in Finned TubingJournal of Heat Transfer, 1960