RESEARCH PAPERS: Phase Change and Multiphase Heat Transfer

Complete Condensation of Forced Convection Two-Phase Flow in a Miniature Tube

[+] Author and Article Information
E. Begg, D. Khrustalev, A. Faghri

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269

J. Heat Transfer 121(4), 904-915 (Nov 01, 1999) (12 pages) doi:10.1115/1.2826081 History: Received July 07, 1998; Revised June 01, 1999; Online December 05, 2007


A physical and mathematical model of annular film condensation in a miniature tube has been developed. In the model the liquid flow has been coupled with the vapor flow along the liquid-vapor interface through the interfacial temperature, heat flux, shear stress, and pressure jump conditions due to surface tension effects. The model predicts the shape of the liquid-vapor interface along the condenser and the length of the two-phase flow region. The numerical results show that complete condensation of the incoming vapor is possible at comparatively low heat loads. Observations from a flow visualization experiment of water vapor condensing in a horizontal glass tube confirm the existence and qualitative features of annular film condensation leading to the complete condensation phenomenon in small diameter (d < 3.5 mm) circular tubes.

Copyright © 1999 by The American Society of Mechanical Engineers
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