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.
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Evaporation of Ammonia in a Smooth Horizontal Tube: Heat Transfer Measurements and Predictions
O. Zu¨rcher,
O. Zu¨rcher
Laboratory of Industrial Energetics (LENI), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland
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J. R. Thome,
J. R. Thome
Laboratory of Heat and Mass Transfer (LTCM), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland
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D. Favrat
D. Favrat
Laboratory of Industrial Energetics (LENI), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland
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O. Zu¨rcher
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
D. Favrat
Laboratory of Industrial Energetics (LENI), Department of Mechanical Engineering, Swiss Federal Institute of Technology-Lausanne, CH-1015 Lausanane, Switzerland
J. Heat Transfer. Feb 1999, 121(1): 89-101 (13 pages)
Published Online: February 1, 1999
Article history
Received:
January 5, 1998
Revised:
October 2, 1998
Online:
December 5, 2007
Citation
Zu¨rcher, O., Thome, J. R., and Favrat, D. (February 1, 1999). "Evaporation of Ammonia in a Smooth Horizontal Tube: Heat Transfer Measurements and Predictions." ASME. J. Heat Transfer. February 1999; 121(1): 89–101. https://doi.org/10.1115/1.2825974
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