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TECHNICAL PAPERS: Evaporative Boiling and Condensation

Condensation of Zeotropic Mixtures in Horizontal Tubes: New Simplified Heat Transfer Model Based on Flow Regimes

[+] Author and Article Information
D. Del Col, A. Cavallini

Dipartimento di Fisica Tecnica, Università di Padova, I-35131, Padova, Italy

J. R. Thome

Laboratory of Heat and Mass Transfer, Faculty of Engineering Science and Technology, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland

J. Heat Transfer 127(3), 221-230 (Mar 24, 2005) (10 pages) doi:10.1115/1.1857951 History: Received October 31, 2003; Revised November 17, 2004; Online March 24, 2005
Copyright © 2005 by ASME
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References

Bell,  K. J., and Ghaly,  M. A., 1973, “An Approximate Generalized Design Method for Multicomponent/Partial Condenser,” AIChE Symp. Ser., 69, pp. 72–79.
Colburn,  A. P., and Drew,  T. B., 1937, “The Condensation of Mixed Vapors,” Trans. AIChemE,33, pp. 197–215.
Webb, D. R., 1995, “Condensation of Vapor Mixtures,” Heat Exchangers Design Handbook, Begell House, New York, pp. 2.6.3-7–2.6.3-11.
Taylor, R., and Krishna, R., 1993, Multicomponent Mass Transfer, Wiley, New York, pp. 435–440.
Cavallini,  A., Censi,  G., Del Col,  D., Doretti,  L., Longo,  G. A., and Rossetto,  L., 2002, “A Tube-in-Tube Water/Zeotropic Mixture Condenser: Design Procedure Against Experimental Data,” Exp. Therm. Fluid Sci., 25, pp. 495–501.
Silver,  L., 1947, “Gas Cooling With Aqueous Condensation,” Trans. Inst. Chem. Eng., 25, pp. 30–42.
Webb,  D. R., Fahrner,  M., and Schwaab,  R., 1996, “The Relationship Between the Colburn and Silver Methods of Condenser Design,” Int. J. Heat Mass Transfer, 39(15), pp. 3147–3156.
Thome,  J. R., El Hajal,  J., and Cavallini,  A., 2003, “Condensation in Horizontal Tubes, Part 2: New Heat Transfer Model Based on Flow Regimes,” Int. J. Heat Mass Transfer, 46, pp. 3365–3387.
Cavallini, A., Del Col, D., Doretti, L., Longo, G. A., and Rossetto, L., 1999, “Condensation of R-22 and R-407C Inside a Horizontal Tube,” Proc. of 20th Int. Congress of Refrigeration, IIR/IIF, France.
Cavallini, A., Censi, G., Del Col, D., Doretti, L., Longo, G. A., Rossetto, L., and Zilio C., 2000, “Analysis and Prediction of Condensation Heat Transfer of the Zeotropic Mixture R-125/236ea,” Proc. of the ASME Heat Transfer Division, ASME, New York, HTD-Vol. 366-4, pp. 103–110.
Lee, C.-C., 1994, “Investigation of Condensation Heat Transfer of R124/22 Nonazeotropic Refrigerant Mixtures in Horizontal Tubes,” Ph.D. thesis, National Chiao Tung University, Taiwan.
Kim, M. S., Chang, Y. S., and Ro, S. T., 1996, “Performance and Heat Transfer of Hydrocarbon Refrigerants and Their Mixtures in a Heat Pump System,” Proc. of IIR Meeting of Comm. B1, B2, E1, E2, Aarhus, IIR, France, pp. 477–486.
El Hajal,  J., Thome,  J. R., and Cavallini,  A., 2003, “Condensation in Horizontal Tubes, Part 1: Two-Phase Flow Pattern Map,” Int. J. Heat Mass Transfer, 46, pp. 3349–3363.
Dittus, F. W., and Boelter, L. M. K., 1930, Publications on Engineering, University of California, Berkeley, Vol. 2, p. 443.
Signe, J. C., Bontemps, A., and Marvillet, Ch., 1995, “Condensation of R134a/R23 Outside a Bundle of Smooth and Enhanced Surface Tubes,” Proc. of Eurotherm Seminar 47, Elsevier, Paris, pp. 146–153.
National Institute of Standard and Technology, 2002, NIST Thermodynamic Properties of Refrigerants and Refrigerant Mixtures Database (REFPROP), Ver. 7.0, Gaithersburg.

Figures

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Top: simplified flow structures for two-phase flow patterns. Bottom: actual geometry (left) and equivalent simplified geometry (right) for fully stratified flow.
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Schematic of the convective and falling film boundaries in the heat transfer model
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number in stratified flow regime. The predicted values are obtained without using the mixture factor Fm. Data by Cavallini et al. 910.
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number in stratified flow regime. The mixture factor Fm is used in the prediction. Data by Cavallini et al. 910.
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Comparison of model to data by Cavallini et al. 910
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Ratio of calculated-to-experimental heat transfer coefficient vs vapor Reynolds number. Data by Cavallini et al. 910.
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Comparison of model to data by Lee 11 and by Kim et al. 13
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Comparison of model to data by Cavallini et al. 910 by vapor quality, mass velocity, and flow pattern
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Comparison of model to data by Lee 11 and Kim et al. 13 by vapor quality, mass velocity, and flow pattern
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Comparison of model to all data by temperature glide
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Percentage of data points predicted to a certain deviation vs deviation
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Simulation of model for condensation of R290/600 (50/50% by mass) at 0.9 MPa in a 8 mm inside diameter tube

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