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RESEARCH PAPERS: Boiling and Condensation

Flow Boiling in Horizontal Tubes: Part 1—Development of a Diabatic Two-Phase Flow Pattern Map

[+] Author and Article Information
N. Kattan, J. R. Thome, D. Favrat

Laboratory for Industrial Energy Systems, Department of Mechanical Engineering, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland

J. Heat Transfer 120(1), 140-147 (Feb 01, 1998) (8 pages) doi:10.1115/1.2830037 History: Received October 01, 1996; Revised July 16, 1997; Online January 07, 2008

Abstract

An improved two-phase flow pattern map is proposed for evaporation in horizontal tubes. The new map was developed based on flow pattern data for five different refrigerants covering a wide range of mass velocities and vapor qualities. The new map is valid for both adiabatic and diabatic (evaporating) flows and accurately identifies about 96 percent of the 702 data points. In addition, the new flow pattern map includes the prediction of the onset of dryout at the top of the tube during evaporation inside horizontal tubes as a function of heat flux and flow parameters.

Copyright © 1998 by The American Society of Mechanical Engineers
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