TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes

[+] Author and Article Information
Jonathan A. Olivier, Leon Liebenberg, Josua P. Meyer

Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria, 0002, South Africa

Mark A. Kedzierski

National Institute of Standards and Technology, Gaithersburg, MD

J. Heat Transfer 126(5), 687-696 (Nov 16, 2004) (10 pages) doi:10.1115/1.1795240 History: Received November 19, 2003; Revised June 15, 2004; Online November 16, 2004
Copyright © 2004 by ASME
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a) Basic geometry of the herringbone microfin tube (not to scale) and b) an illustration of how condensate is distributed inside the tube for the adopted orientation (exaggerated)
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Schematic of the experimental facility
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Determining the transition qualities by making use of a) the Thome 9 map for the smooth tube, and the method used by Liebenberg et al. 13 for b) the helical microfin tube and c) the herringbone microfin tube
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Pressure gradients at mass fluxes of 400, 600, and 800 kg/m2 s for the three tubes and refrigerants tested
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Average pressure drops of the experimental data and that predicted by Miyara et al. 4 and the newly developed correlation for refrigerants R-22, R-407C, and R-134a
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Penalty factors for the herringbone microfin tube against a) the smooth tube and b) the helical microfin tube for R-22, R-407C, and R-134a
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Comparison of the experimental data with the modified prediction data for R-22, R-407C and R-134a





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