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RESEARCH PAPERS: Phase Change and Multiphase Heat Transfer

Evaporation of Ammonia in a Smooth Horizontal Tube: Heat Transfer Measurements and Predictions

[+] Author and Article Information
O. Zürcher, D. Favrat

Laboratory of Industrial Energetics (LENI), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland

J. R. Thome

Laboratory of Heat and Mass Transfer (LTCM), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland

J. Heat Transfer 121(1), 89-101 (Feb 01, 1999) (13 pages) doi:10.1115/1.2825974 History: Received January 05, 1998; Revised October 02, 1998; Online December 05, 2007

Abstract

Experimental test results for flow boiling of pure ammonia inside horizontal tubes were obtained for a plain stainless steel tube. Tests were run at a nominal saturation temperature of 4°C, nine mass velocities from 20–140 kg/m2 s, vapor qualities from 1–99 percent and heat fluxes from 5–58 kW/m2 . Two-phase flow observations showed that the current test data covered the following regimes: fully stratified, stratified-wavy, intermittent, annular, and annular with partial dryout. The Kattan-Thome-Favrat flow boiling model accurately predicted the local heat transfer coefficients measured in all these flow regimes with only two small modifications to their flow map (to extend its application to G < 100 kg/m2 s). Their flow boiling model was also successfully compared to the earlier ammonia flow boiling data of Chaddock and Buzzard (1986). The Gungor-Winterton (1987) correlation instead gave very poor accuracy for ammonia.

Copyright © 1999 by The American Society of Mechanical Engineers
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