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An Experimental Study on Evaporative Heat Transfer Characteristics in a Small Diameter Tube
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 Title & Authors
An Experimental Study on Evaporative Heat Transfer Characteristics in a Small Diameter Tube
Hwang, Yun-Uk; Kim, Min-Su;
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 Abstract
Experiments have been performed to investigate evaporative heat transfer characteristics of R-134a flowing in a small diameter tube. Test section was made of stainless steel tube with an inner diameter of 2.2mm and was uniformly heated by electric current which was applied to the tube wall. The local saturation temperature of refrigerant flowing in a tube is calculated from the measured local saturation pressure by using an equation of state. Inner wall temperature was calculated from measured outer wall temperature, accounting for heat generation in the tube and one dimensional heat conduction through the tube wall. Mass quality of refrigerant flowing in a tube was calculated by considering energy balance in the pre-heater and the test section. Heat flux was varied from 19 to 64kW/, and mass flux was chanted from 380 to 570kg/s for each heat flux condition. From this study, heat transfer in a small diameter tube is affected by heat flux as well as mass flux for a wide range of mass quality. Heat transfer coefficient in a small diameter tube is much greater than that in medium sized tubes. Test results in this study are compared with Gungor and Winterton correlation, which gives an absolute average deviation of 27%.
 Keywords
Evaporative Heat Transfer;Small Diameter Tube;R-134a;Compact Heat Exchanger;
 Language
Korean
 Cited by
1.
수평미세관의 직경이 R-22 및 R-407C 비등열전달에 미치는 영향,윤국영;최광일;오종택;

대한기계학회논문집B, 2003. vol.27. 2, pp.163-172 crossref(new window)
 References
1.
Kays, W. M., 1964, Compact Heat Exchangers, McGraw-Hill

2.
Chamra, L. M. and Webb, R. L., 1996, 'Advanced Microfin Tubes for Evaporation,' Int. J. Heat Mass Transfer, Vol. 39, No. 9, pp. 1827-1838 crossref(new window)

3.
Schlager, L. M., Pate, M. B. and Bergles, A. E., 1990, 'Evaporation and Condensation Heat Transfer and Pressure Drop in Horizontal, 12.7mm Microfin Tubes with Refrigerant 22,' J. Heat Transfer, Vol. 112, pp. 1041-1047

4.
Wambsganss, M. W., France, D. M., Jendrzejczyk, J.A. AND Tran, T. N., 1993, 'Boiling Heat Transfer in a Horizontal Small-Diameter Tube', J. Heat Transfer, Vol. 115, pp. 963-972

5.
Wambsganss, M. W., Jendrzejczyk, J. A. and France, D. M., 1991, 'Two-Phase Flow Patterns and Transitions in a Small, Horizontal, Rectangular Channel,' Int. J. Multiphase Flow, Vol. 17, No. 3, pp. 327-342 crossref(new window)

6.
Pettersen, J., Hafner, A., Skaugen, G. and Rekstad, H., 1998, 'Development of Compact Heat Exchangers for CO$_2$ Air-Conditioning Systems,' Int. J. Refrig, Vol. 21, No. 3, pp. 180-193 crossref(new window)

7.
Kew, P. A. and Cornwell, K., 1997, 'Correlations for the Prediction of Boiling Heat Transfer in Small-Diameter Channels,' Applied Thermal Engineering, Vol. 17, pp. 705-715 crossref(new window)

8.
Peng, X. F. and Wang, B. X., 1993, 'Forced Convection and Flow Boiling Heat Transfer for Liquid Flowing Through Microchannles,' Int. J. Heat Mass Transfer, Vol. 36, No. 14, pp. 3421-3427 crossref(new window)

9.
McLinden, M. O., Kleine, S. A., Lemmon, E. W. and Peskin, A. P., 1998, NIST Standard Reference Database 23, Thermodynamic and Transport Properties of Refrigerants and Refrigerant Mixtures(REPROP), Version 6.0, National Institute of Standards and Technology, Boulder, Colorado, U.S.A.

10.
Coleman, H. W.;Steele, W. G., 1989, Experimentation and Uncertainty Analysis for Engineers, John Wiley and Sons Inc.

11.
Damianides, C. A. and Westwater, J. W., 1988, 'Two-phase flow Patterns in a Compact Heat Exchanger and in Small Tubes,' In Proc. 2nd UK Nat'l Conf. on Heat Transfer, Vol. II, pp. 1257-1268

12.
신지영, 김민수, 노승탁, 1996, '순수 및 혼합냉매의 원관내 증발열전달 실험,' 대한기계학회논문집(B), 제20권, 제2호, pp. 730-740

13.
Jung, D. S. and Radermacher, R., 1989, 'Prediction of Pressure Drop during Horizontal Annular Flow Boiling of Pure and Mixed Refrigerants,' Int. J. Heat Mass Transfer, Vol. 32, No. 12, pp. 2435-2446 crossref(new window)

14.
Jung, D. S., McLinden, M., Radermacher, R. and Didion, D., 1993, 'Horizontal Flow Boiling Heat Transfer Experiments with a Mixture of R22/R114,' Int. J. Heat Mass Transfer, Vol. 32, No. 1, pp. 131-145 crossref(new window)

15.
Fukano, T. and Kariyasaki, A., 1993, 'Characteristics of Gas-Liquid Two-Phase Flow in a Capillary Tube,' Nuclear Engineering and Design, Vol. 141, pp. 59-68 crossref(new window)

16.
Gungor, K. E. and Winterton, R. H. S., 1987, 'Simplified General Correlation for Correlations with Data,' Chem. Eng. Res. Des., Vol. 65, pp. 148-156

17.
Hwang, Y. W., Kim, M. S. and Ro, S. T., 2000, 'Experimental Study of Evaporative Heat Transfer Characteristics in a Small Diameter Tube Using R-134a,' Symposium on Energy Engineering(SEE 2000), January 9-13, Hong Kong, pp. 965-971

18.
Collier, J. G. and Thome, J. R., 1994, Convective Boiling Condensation, 3rd ed., Oxford Univ. Press, New York