• Vol 2, No 2 (2011)
  • Mechanical Engineering

Two-Phase Flow Boiling Heat Transfer Of R-410A and R-134A in Horizontal Small Tubes

Kwang-Il Choi, Jong-Taek Oh


Publish at : 01 Jun 2011
IJtech : IJtech Vol 2, No 2 (2011)
DOI : https://doi.org/10.14716/ijtech.v2i2.63

Cite this article as:
Choi, K., Oh, J., 2011. Two-Phase Flow Boiling Heat Transfer Of R-410A and R-134A in Horizontal Small Tubes. International Journal of Technology. Volume 2(2), pp. 139-146
189
Downloads
Kwang-Il Choi Department of Refrigeration and Air Conditioning Engineering, Chonnam National University, Yeosu, Chonnam 550-749, Korea
Jong-Taek Oh Department of Refrigeration and Air Conditioning Engineering, Chonnam National University, Yeosu, Chonnam 550-749, Korea
Email to Corresponding Author

Abstract
image

Experimental investigation on two-phase flow boiling heat transfer of R-410A and R-134A in horizontal small tubes is reported. The pressure drop and local heat transfer coefficients were obtained over heat flux range of 5 to 40 kW/m2 , mass flux range of 70 to 600kg/ m2 s, saturation temperature range of 2 to 12°C, and quality up to 1.0 in test section with inner tube diameters of 3.0 and 0.5mm, and lengths of 2000 and 330mm, respectively. The section was heated uniformly by applying a direct electric current to the tubes. The effects of mass flux, heat flux, and inner tube diameter on pressure drop and heat transfer coefficients are presented. The experimental results are compared against several existing correlations. A new boiling heat transfer coefficient correlation based on the superposition model for refrigerants in small tubes is also presented.

Heat transfer coefficient, Horizontal minichannel, Pressure drop, R-134A; R-410A, Two-phase vaporization

References

Chen, J.C., 1966. A Correlation for Boiling Heat Transfer to Saturated Fluids in Convective Flow. Industrial and Engineering Chemistry, Process Des. Dev. 5, pp. 322-329.
Chisholm, D., 1967. A Theoretical Basis for the Lockhart-Martinelli Correlation for Two-Phase Flow. International Journal Heat Mass Transfer, Vol. 10, pp. 1767-1778.
Cooper, M.G., 1984. Heat Flow Rates in Saturated Nucleate Pool Boiling a Wide-Ranging Examination using Reduced Properties. In: Advances in Heat Transfer, Vol. 16, Academic Press, pp.157-239.
Dittus, F. W., Boelter, L. M. K., 1930. Heat Transfer in Automobile Radiators of the Tubular Type. University of California Publication in Engineering 2, pp. 443-461.
Gungor, K. E., Winterton, H. S., 1987. Simplified General Correlation for Saturated Flow Boiling and Comparisons of Correlations with Data. Chemical Engineering Res., Vol. 65, pp.148-156, Elsevier.
Mishima, K., Hibiki, T., 1996. Some Characteristics of Air-Water Two-Phase Flow in Small Diameter Vertical Tubes. International Journal Multiphase Flow, Vol. 22, pp.703-712, Elsevier.
Steiner, D., 1993. Heat Transfer to Boiling Saturated Liquids. VDI-Wärmeatlas (VDI Heat Atlas), Verein Deutcher Ingenieure, ed., VDI-Gessellschaft Verfahrenstechnik und Chemieinge- nieurwesen (GCV), Düsseldorf, Germany, (J.W. Fullarton, translator).
Tran, T. N., Wambsganss, M. W., France, D.M., 1996. Small Circular- and Rectangularchannel Boiling with Two Refrigerants. International Journal Multiphase Flow, Vol. 22, Number 3, pp. 485-498, Elsevier.
Zhang, W., Hibiki, T., Mishima, K., 2004. Correlation for Flow Boiling Heat Transfer in Minichannels, International Journal Heat and Mass Transfer, Vol. 47, pp. 5749-5763, Elsevier.

Table of Contents