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TECHNICAL PAPERS: Boiling and Condensation

Condensation of Refrigerants in Horizontal, Spirally Grooved Microfin Tubes: Numerical Analysis of Heat Transfer in the Annular Flow Regime

[+] Author and Article Information
S. Nozu

Department of Systems Engineering, Okayama Prefectural University, 111, Kuboki, Soja, Okayama 719-1197, Japan e-mail: nozu@cse.oka-pu.ac.jp

H. Honda

Institute of Advanced Material Study, Kyushu University, 6-12, Kasuga-Kouen, Kasuga, Fukuoka 816-8580, Japan

J. Heat Transfer 122(1), 80-91 (Aug 01, 1999) (12 pages) doi:10.1115/1.521439 History: Received August 27, 1998; Revised August 01, 1999
Copyright © 2000 by ASME
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References

Khanpara, J. C., Bergles, A. E., and Pate, M. B., 1986, “Augmentation of R-113 In-tube Condensation With Micro-fin Tubes,” in Heat Transfer in Air Conditioning and Refrigeration Equipment, J. A. Kohler and J. W. B. Lu, eds., ASME, NY, pp. 21–32.
Schlager,  L. M., Pate,  M. B., and Bergles,  A. E., 1989, “Heat Transfer and Pressure Drop During Evaporation and Condensation of R22 in Horizontal Micro-fin Tubes,” Int. J. Refrig., 12, pp. 6–14.
Schlager,  L. M., Pate,  M. B., and Bergles,  A. E., 1990, “Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal, 12.7-mm Microfin Tubes with Refrigerant 22,” J. Heat Transfer, 112, pp. 1041.
Schlager, L. M., Pate, M. B., and Bergles, A. E., 1990, “Condensation of Refrigerant-Oil Mixture in Smooth and Augmented Tubes,” Proceedings of the 2nd International Symposium on Condensers and Condensation, Mar. 28–30, University of Bath, Bath, UK, pp. 451–460.
Hori,  M., and Shinohara,  Y., 1990, “Heat Transfer Characteristics of Internally Grooved Tubes,” Shindo-Gizyutsu Kenkyuukai-shi, 29, pp. 65–70.
Koyama,  S., Miyara,  A., Takamatsu,  H., and Fujii,  T., 1990, “Condensation Heat Transfer of Binary Refrigerant Mixtures of R22 and R114 Inside a Horizontal Tube with Internal Spiral Grooves,” Int. J. Refrig., 13, pp. 256–263.
Haraguchi, H., 1994, “Study on Condensation of HCFC22, HFC134a and HCFC123 Inside Horizontal Tubes,” Dr. Eng. thesis, Kyushu University.
Chamra,  L. M., and Webb,  R. L., 1996, “Advanced Micro-Fin Tubes for Condensation,” Int. J. Heat Mass Transf., 39, pp. 1839–1846.
Webb, R. L., 1994, Principles of Enhanced Heat Transfer, John Wiley and Sons, New York.
Fujii,  T., 1995, “Enhancement to Condensing Heat Transfer–New Developments,” J. Enhanced Heat Transfer, 2, pp. 127–137.
Sirnivasan, V., and Shah, R. K., 1997, “Condensation in Extended Surfaces and Small Hydraulic Diameter Channels,” Compact Heat Exchangers for the Process Industries, R. K. Shah, et al., eds., Begell House, New York, pp. 101–118.
Shikazono,  N., Itoh,  M., Uchida,  M., Fukushima,  T., and Hatada,  T., 1997, “Prediction Method for Condensation Heat Transfer Coefficient of Pure Refrigerants in Horizontal Microfin Tubes,” Trans. Jpn. Soc. Mech. Eng., Ser. B, 63, pp. 2436–2443.
Shikazono,  N., Itoh,  M., Uchida,  M., Fukushima,  T., and Hatada,  T., 1998, “Predictive Equation Proposal for Condensation Heat Transfer Coefficient of Pure Refrigerants in Horizontal Microfin Tubes,” Trans. Jpn. Soc. Mech. Eng., Ser. B, 64, pp. 196–203.
Dobson,  M. K., and Chato,  J. C., 1998, “Condensation in Smooth Horizontal Tubes,” J. Heat Transfer, 120, pp. 193–213.
Nozu,  S., Katayama,  H., Nakata,  H., and Honda,  H., 1998, “Condensation of a Refrigerant CFC11 in Horizontal Microfin Tubes (Proposal of a Correlation Equation for Frictional Pressure Gradient),” Exp. Therm. Fluid Sci., 18, pp. 82–96.
Honda,  H., and Nozu,  S., 1987, “A Prediction Method for Heat Transfer During Film Condensation on Horizontal Low Integral-Fin Tubes,” J. Heat Transfer, 109, pp. 218–225.
Wallis, G. B., 1969, One-Dimensional Two-Phase Flow, McGraw-Hill, New York.

Figures

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Schematic diagram of experimental apparatus
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Fin profile per one half of fin pitch in a-a cross section; nondimensionalized by fin pitch
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Illustration of a subsection
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Details of observation devices attached to tube exit; side-viewing type scope
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Axial distributions of measured quantities, G≅300 kg/(m2s): (a) tube S1, (b) tube M1, (c) tube M2
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Circumferential variation of condensate behavior: tube M1, G=170 kg/(m2s),X=0.4
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Physical model and coordinates
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Comparison of measured and predicted Nud values; effect of fin dimensions, tubes M1 and M2
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Axial development of condensate profile: (a) tube M1, (b) tube M2
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Comparison of measured and predicted Nud values: effect of mass velocity, tube M1
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Comparison of measured and predicted Nud values: effect of fluid properties, tube M3
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Comparison of measured and predicted local heat transfer coefficients: tubes M1 and M2
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Comparison of measured and predicted local heat transfer coefficients: tube M3

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