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RESEARCH PAPERS

Film Condensation Over a Horizontal Cylinder for Combined Gravity and Forced Flow

[+] Author and Article Information
M. di Marzo

Mechanical Engineering Department, University of Maryland, College Park, MD

M. J. Casarella

Mechanical Engineering Department, The Catholic University of America, Washington, D.C.

J. Heat Transfer 107(3), 687-695 (Aug 01, 1985) (9 pages) doi:10.1115/1.3247478 History: Received April 26, 1983; Online October 20, 2009

Abstract

The problem of laminar film condensation of a saturated vapor flowing over a cold horizontal cylinder is investigated. A rigorous formulation of the governing equations for the vapor boundary layer and the condensed liquid film, including both the gravity-driven body forces and the imposed pressure gradient caused by the vapor flow, is presented. A generalized transformation of the governing equations allows a wide range of Froude numbers to be investigated. A unique value of the Froude number is defined which allows a distinction between the gravity-dominated flow (Fr→0) and the forced flow (Fr→∞) and basically defines the overlap region for the two solution domains. Numerical solutions are obtained in the merging flow regions controlled by both driving forces. The effects of density/viscosity ratio at the liquid-vapor interface, Prandtl number, Jakob number, and Froude number on the heat transfer characteristics are presented.

Copyright © 1985 by ASME
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