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Research Papers: Evaporation, Boiling, and Condensation

Convective Condensation Inside Horizontal Smooth and Microfin Tubes

[+] Author and Article Information
Zan Wu

Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22100, Sweden
Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China

Bengt Sundén

Department of Energy Sciences,
Lund University,
Box 118,
Lund SE-22100, Sweden
e-mail: bengt.sunden@energy.lth.se

Lei Wang

Department of Energy Sciences,
Lund University,
Box 118
Lund SE-22100, Sweden

Wei Li

Department of Energy Engineering,
Zhejiang University,
Hangzhou 310027, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 26, 2012; final manuscript received December 19, 2013; published online March 6, 2014. Assoc. Editor: W. Q. Tao.

J. Heat Transfer 136(5), 051504 (Mar 06, 2014) (11 pages) Paper No: HT-12-1591; doi: 10.1115/1.4026370 History: Received October 26, 2012; Revised December 19, 2013

An experimental investigation was performed for convective condensation of R410A inside one smooth tube (3.78 mm, inner diameter) and six microfin tubes (4.54, 4.6 and 8.98 mm, fin root diameter) of different geometries for mass fluxes ranging from 99 to 603 kg m−2s−1. The experimental data were analyzed with updated flow pattern maps and evaluated with existing correlations. The heat transfer coefficient in the microfin tubes decreases at first and then increases or flattens out gradually as mass flux decreases. This obvious nonmonotonic heat transfer coefficient-mass flux relation may be explained by the complex interactions between the microfins and the fluid, mainly by surface tension effects. The heat transfer enhancement mechanism in microfin tubes is mainly due to the surface area increase at large mass fluxes, while liquid drainage by surface tension and interfacial turbulence enhance heat transfer greatly at low mass fluxes.

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References

Webb, R. L., and Kim, N. H., 2005, Principles of Enhanced Heat Transfer, 2nd ed., Taylor & Francis Group, New York.
Thome, J. R., 2004, Engineering Data Book III, Wolverine Tube, Inc., Ardmore, TN.
Chamra, L. M., Mago, P. J., Tan, M. O., and Kung, C. C., 2005, “Modeling of Condensation Heat Transfer of Pure Refrigerants in Micro-Fin Tubes,” Int. J. Heat Mass Transfer, 48(7), pp. 1293–1302. [CrossRef]
Chamra, L. M., Tan, M. O., and Kung, C. C., 2004, “Evaluation of Existing Condensation Heat Transfer Models in Horizontal Micro-Fin Tubes,” Exp. Therm. Fluid Sci., 28(6), p. 617628. [CrossRef]
Dalkilic, A. S., and Wongwises, S., 2009, “Intensive Literature Review of Condensation Inside Smooth and Enhanced Tubes,” Int. J. Heat Mass Transfer, 52(15), pp. 3409–3426. [CrossRef]
Liebenberg, L., and Meyer, J. P., 2008, “A Review of Flow Pattern-Based Predictive Correlations During Refrigerant Condensation in Horizontally Smooth and Enhanced Tubes,” Heat Transfer Eng., 29(1), pp. 3–19. [CrossRef]
Nozu, S., and Honda, H., 2000, “Condensation of Refrigerants in Horizontal, Spirally Grooved Micro-Fin Tubes: Numerical Analysis of Heat Transfer in Annular Flow Regime,” ASME J. Heat Transfer, 122(1), pp. 80–91. [CrossRef]
Jung, D., Cho, Y., and Park, K., 2004, “Flow Condensation Heat Transfer Coefficients of R22, R134a, R407C, and R410A Inside Plain and Microfin Tubes,” Int. J. Refrig., 27(1), pp. 25–32. [CrossRef]
Olivier, J. A., Liebenberg, L., Thome, J. R., and Meyer, J. P., 2007, “Heat Transfer, Pressure Drop, and Flow Pattern Recognition During Condensation Inside Smooth, Helical Micro-Fin, and Herringbone Tubes,” Int. J. Refrig., 30(4), pp. 609–623. [CrossRef]
Sapali, S. N., and Patil, P. A., 2010, “Heat Transfer During Condensation of HFC-134a and R-404A Inside of a Horizontal Smooth and Micro-Fin Tube,” Exp. Therm. Fluid Sci., 34(8), pp. 1133–1141. [CrossRef]
Mohseni, S. G., and Akhavan-Behabadi, M. A., 2011, “Visual Study of Flow Patterns During Condensation Inside a Microfin Tube With Different Tube Inclinations,” Int. Commun. Heat Mass Transfer, 38(8), pp. 1156–1161. [CrossRef]
Son, C. H., and Oh, H. K., 2012, “Condensation Heat Transfer Characteristics of CO2 in a Horizontal Smooth- and Microfin-Tube at High Saturation Temperatures,” Appl. Therm. Eng., 36(1), pp. 51–62. [CrossRef]
Cavallini, A., Del Col, D., Mancin, S., and Rossetto, L., 2009, “Condensation of Pure and Near-Azeotropic Refrigerants in Microfin Tubes: A New Computational Procedure,” Int. J. Refrig., 32(1), pp. 162–174. [CrossRef]
Huang, X. C., Ding, G. L., Hu, H. T., Zhu, Y., Gao, Y. F., and Deng, B., 2010, “Condensation Heat Transfer Characteristics of R410A-Oil Mixture in 5 mm and 4 mm Outside Diameter Horizontal Microfin Tubes,” Exp. Therm. Fluid Sci., 34(7), pp. 845–856. [CrossRef]
Kim, Y. J., Jang, J., Hrnjak, P. S., and Kim, M. S., 2009, “Condensation Heat Transfer of Carbon Dioxide Inside Horizontal Smooth and Microfin Tubes at Low Temperatures,” ASME J. Heat Transfer, 131(2), p. 021501. [CrossRef]
Han, D., and Lee, K. J., 2005, “Experimental Study on Condensation Heat Transfer Enhancement and Pressure Drop Penalty Factors in Four Microfin Tubes,” Int. J. Heat Mass Transfer, 48(18), pp. 3804–3816. [CrossRef]
Gnielinski, V., 1976, “New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow,” Int. Chem. Eng., 16, pp. 359–368.
Ravigururajan, T. S., and Bergles, A. E., 1985, “General Correlations for Pressure Drop and Heat Transfer for Single-Phase Turbulent Flow in Internally Ribbed Tubes,” Augmentation of Heat Transfer in Energy Systems, ASME HTD, Vol. 52, pp. 9–20.
Li, G. Q., Wu, Z., Li, W., Wang, Z. K., Wang, X., Li, H. X., and Yao, S. C., 2012, “Experimental Investigation of Condensation in Microfin Tubes of Different Geometries,” Exp. Therm. Fluid Sci., 37(1), pp. 19–28. [CrossRef]
Sundén, B., 2012, Introduction to Heat Transfer, WIT Press, Southampton, UK.
Petukhov, B. S., 1970, “Heat Transfer and Friction in Turbulent Pipe Flow With Variable Physical Properties,” Adv. Heat Transfer, 6, pp. 503–564. [CrossRef]
Rouhani, S. Z., and Axelsson, E., 1970, “Calculation of Void Volume Fraction in the Subcooled and Quality Boiling Regions,” Int. J. Heat Mass Transfer, 13(2), pp. 383–393. [CrossRef]
Lemmon, E. W., Huber, M. L., and McLinden, M. O., 2007, “NIST Reference Fluid Thermodynamic and Transport Properties,” REFPROP 8.0.
Wu, Z., Wu, Y., Sundén, B., and Li, W., 2013, “Convective Vaporization in Micro-Fin Tubes of Different Geometries,” Exp. Therm. Fluid Sci., 44(1), pp. 398–408. [CrossRef]
Liebenberg, L., and Meyer, J. P., 2006, “The Characterization of Flow Regimes With Power Spectral Density Distributions of Pressure Fluctuations During Condensation in Smooth and Micro-Fin Tubes,” Exp. Therm. Fluid Sci., 31(2), pp. 127–140. [CrossRef]
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(18), pp. 3349–3363. [CrossRef]
Cavallini, A., Del Col, D., Doretti, L., Matkovic, M., Rossetto, L., Zilio, C., and Censi, G., 2006, “Condensation in Horizontal Smooth Tubes: A New Heat Transfer Model for Heat Exchanger Design,” Heat Transfer Eng., 27(1), pp. 31–38. [CrossRef]
Doretti, L., Fantini, F., and Zilio, C., 2005, “Flow Patterns During Condensation of Three Refrigerants: Microfin vs. Smooth Tube,” Proceedings IIR International Conference Thermophysical Properties and Transfer Processes of Refrigerants, Vicenza, Padova, Italy.
Gronnerud, R., 1979, “Investigation of Liquid Hold-Up, Flow-Resistance and Heat Transfer in Circulation Type Evaporators, Part IV: Two-Phase Flow Resistance in Boiling Refrigerants,” Annexe 1972-1, Bull. de I' Inst. du Froid.
Choi, J. Y., Kedzierski, M. A., and Domanski, P. A., 2001, “Generalized Pressure Drop Correlation for Evaporation and Condensation in Smooth and Micro-Fin Tubes,” Proceedings of IIF-IIR Commission B1, Paderborn, Germany, Vol. B4, pp. 9–16.
Haraguchi, H., Koyama, S., Esaki, J., and Fujii, T., 1993, “Condensation Heat Transfer of Refrigerants HCFC134a, HCFC123, and HCFC22 in a Horizontal Smooth Tube and a Horizontal Micro-Fin Tube,” Proceedings of 30th National Symposium, Yokohama, Japan, pp. 343–345.
Churchill, S. W., 1977, “Friction Factor Equation Spans all Fluid Flow Regimes,” Chem. Eng., 84(1), pp. 91–92.
Eckels, S. J., and Tesene, B. A., 1999, “A Comparison of R22, R134a, R410a, and R407C Condensation Performance in Smooth and Enhanced Tubes, Part 1: Heat Transfer,” ASHRAE Trans., 105, pp. 428–441.
Yang, C. Y., and Webb, R. L., 1997, “A Predictive Model for Condensation in Small Hydraulic Diameter Tubes Having Axial Micro-Fins,” ASME J. Heat Transfer, 119(4), pp. 776–782. [CrossRef]
Kedzierski, M. A., and Goncalves, J. M., 1999, “Horizontal Convective Condensation of Alternative Refrigerants Within a Micro-Fin Tube,” J. Enhanced Heat Transfer, 6(2–4), pp. 161–178.
Yu, J., and Koyama, S., 1998, “Condensation Heat Transfer of Pure Refrigerants in Microfin Tubes,” Proceedings of International Refrigeration Conference at Purdue, West Lafayette, IN, pp. 325–330.
Cavallini, A., Del Col, D., Mancin, S., and Rossetto, L., 2006, “Thermal Performance of R410A Condensing in a Microfin Tube,” Proceedings of International Refrigeration and Air Conditioning Conference at Purdue University, West Lafayette, IN.
Kim, M. H., and Shin, J. S., 2005, “Condensation Heat Transfer of R22 and R410A in Horizontal Smooth and Microfin Tubes,” Int. J. Refrig., 28(6), pp. 949–957. [CrossRef]

Figures

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Fig. 1

Microfin surface geometry and cross-sectional profile of the microfin tube: (a) geometric parameters of the microfin surface and (b) cross-sectional profile of the microfin tube

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Fig. 2

Schematic drawings of (a): test rig and (b): test section

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Fig. 3

Flow pattern maps for R410A in horizontal smooth tubes and updated for use in microfin tubes at Tsat = 320 K: (a) the updated El Hajal et al. map [26] at di = 3.78, 4.60, and 8.98 mm and (b) the updated Cavallini et al. map [27] at di = 4.60 mm

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Fig. 4

Condensation (a) frictional pressure drop and evaluated by the Gronnerud correlation [29] and (b) heat transfer coefficient and evaluated by the Cavallini et al. correlation [27] in the smooth tube with 3.78 mm ID, at Tsat = 320 K, with inlet and outlet vapor qualities of 0.8 and 0.1, respectively

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Fig. 5

Condensation frictional pressure drop in microfin tubes: (a) experimental data and (b) comparison of experimental data and predicted values by existing correlations

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Fig. 6

Condensation heat transfer coefficient versus mass flux in microfin tubes: (a) experimental heat transfer data and (b) comparison of experimental data and predicted values by existing correlations, with inlet and outlet vapor qualities of 0.8 and 0.1, respectively

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Fig. 7

Heat transfer comparisons of Tube 1, Tube 4, Tube 6 with Huang et al. [14] (di = 4.6 mm, ns = 40, α = 40 deg, β = 18 deg, e = 0.14 mm), Jung et al. [8] (di = 8.92 mm, ns = 60, α = 53 deg, β = 18 deg, e = 0.2 mm), Cavallini et al. [37] (di = 8.15 mm, ns = 60, α = 43 deg, β = 13 deg, e = 0.23 mm) and Kim and Shin [38] (di = 8.9 mm, ns = 60, α = 53 deg, β = 18 deg, e = 0.2 mm)

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Fig. 8

The ratio hMF/(hS*A/Ani) versus mass flux for both R22 [19] and R410A condensation inside the tested microfin tubes

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