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RESEARCH PAPERS: Boiling and Condensation

A New Model for Forced-Convection Condensation on Integral-Fin Tubes

[+] Author and Article Information
A. Cavallini, L. Doretti, G. A. Longo, L. Rossetto

Istituto di Fisica Tecnica, Università di Padova, Padova, Italy

J. Heat Transfer 118(3), 689-693 (Aug 01, 1996) (5 pages) doi:10.1115/1.2822687 History: Received October 02, 1995; Revised March 19, 1996; Online December 05, 2007

Abstract

This work investigates the effects of vapor shear during pure vapor external condensation on horizontal integral-fin tubes. More than 220 experimental data points in a wide range of operative conditions and enhanced surface geometries are reported together with the visual observation of the condensate flow patterns. The effects of vapor shear are relevant only for vapor Reynolds numbers greater than 70,000–100,000, while heat transfer enhancement is linked to the geometry of the extended surface. A simple semi-empirical equation was developed to account for the shear stress contribution in forced-convection condensation: this equation, applied in conjunction with the model by Briggs and Rose (1994) for stationary vapor condensation, displays a good ability in reproducing all the available data with relevant vapor velocities.

Copyright © 1996 by The American Society of Mechanical Engineers
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