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Evaporating Heat Transfer Characteristics of R-l34a in a Horizontal Smooth Channel |

Pamitran, A.S.
(Graduate School, Department of Refrigeration Engineering, Chonnam National University)
Choi, Kwang-Il (Graduate School, Department of Refrigeration Engineering, Chonnam National University) Oh, Jong-Taek (Department of Refrigeration Engineering, Chonnam National University) Oh, Hoo-Kyu (Department of Refrigeration and A/C Engineering, Pukyong National University) |

Publication Information

International Journal of Air-Conditioning and Refrigeration
/ v.14, no.4,
2006
, pp.
156-165
More about this Journal

Abstract

Convective boiling heat transfer coefficients were measured in a horizontal minichannel with R-l34a. The test section was made of stainless steel tube with an inner diameter of 3.0 mm and a length of 2m. It was uniformly heated by applying electric current directly to the tube. Local heat transfer coefficients were obtained for heat fluxes from 10 to , mass fluxes from 200 to , qualities up to 1.0, and the inlet saturation temperature of . The experimental results were mapped on Wojtan et and Wang et flow pattern maps. The nucleate boiling was predominant at low vapor quality whereas the convective boiling was predominant at high vapor quality. Laminar flow appeared in the flow with minichannel. The experimental results were compared with six existing two-phase heat transfer coefficient correlations. A new boiling heat transfer coefficient correlation based on the superposition model for refrigerants was developed with mean and average deviations of 10.39% and -3.66%, respectively.

Keywords

R-l34a; Flow boiling; Flow pattern; Heat transfer coefficient; Horizontal minichannel;

Citations & Related Records

- Reference

1 | Kandlikar, S. G. and Steinke, M. E., 2003, Predicting heat transfer during flow boiling in minichannels and microchannels, ASHRAE Trans., CH-03-13-1, pp.667-676 |

2 | Wojtan, L., Ursenbacher, T. and Thome, J. R, 2005, Investigation of flow boiling in horizontal tubes: Part I - A new diabatic two-phase flow pattern map, Int. J. Heat and Mass Transfer, Vol. 48, pp. 2955-2969 DOI ScienceOn |

3 | Pamitran, A. S., Choi, K. I., Oh, J, T. and Oh, H. K, 2006, Forced convective boiling heat transfer of R-410A in horizontal minichannels, Int. J, Refrigeration, In-Press |

4 | Chen, J. C., 1966, A correlation for boiling heat transfer to saturated fluids in convective flow, Industrial and Engineering Chemistry, Process Design and Development, Vol. 5, pp. 322-329 DOI |

5 | Wang, C. C., Chiang, C. S. and Lu, D. C., 1997, Visual observation of two-phase flow pattern of R-22, R-134a, and R-407C in a 6.5-mm smooth tube, Experimental Thermal and Fluid Science, Vol. 15, pp. 395-405 DOI ScienceOn |

6 | Shah, M. M., 1982, Chart correlation for saturated boiling heat transfer: equations and further study, ASHRAE Trans., Vol. 88, pp. 185-196 |

7 | Steiner, D., 1993, Heat transfer to boiling saturated liquids, VDI-Warmeatlas (VDI Heat Atlas), Verein Deutcher Ingenieure, ed., VDI-Gessellschaft Verfahrenstechnik und Chemieinge- nieurwesen (GCV), Dusseldorf, Germany (J. W. Fullarton, translator) |

8 | Gungor, K. E. and Winterton, H. S. 1987, Simplified general correlation for saturated flow boiling and comparisons of correlations with data, Chem. Eng. Res., Vol. 65, pp. 148-156 |

9 | Wambsganss, M. W., France, D. M., Jendrzejczyk, J. A. and Tran, T. N., 1993, Boiling heat transfer in a horizontal small-diameter tube, Journal of Heat Transfer, Vol. 115, pp. 963-975 DOI ScienceOn |

10 | Chisholm, D., 1967, A theoretical basis for the Lockhart-Martinelli correlation for twophase flow, Int. J. Heat Mass Transfer, Vol. 10, pp. 1767-1778 DOI ScienceOn |

11 | Jung, D. S., McLinden, M., Radermacher, R. and Didion, D., 1989, A study of flow boiling heat transfer with refrigerant mixtures, Int. J. Heat Mass Transfer, Vol. 32, No. 9, pp. 1751-1764 DOI ScienceOn |

12 | Kew, P. A. and Cornwell, K., 1997, Correlations for the prediction of boiling heat transfer in small-diameter channels, Applied Thermal Engineering, Vol. 17(8-10), pp. 705-715 DOI ScienceOn |

13 | Bao, Z. Y., Fletcher, D. F. and Haynes, B. S., 2000, Flow boiling heat transfer of freon R11 and HCFC123 in narrow passages, Int. J, Heat and Mass Transfer, Vol. 43, pp. 3347-3358 DOI ScienceOn |

14 | Lazarek, G. M. and Black, S. H., 1982, Evaporative heat transfer, pressure drop and critical heat flux in a small diameter vertical tube with R-113, Int. J, Heat Mass Transfer, Vol. 25, pp. 945-960 DOI ScienceOn |

15 | Wattelet, J. P., Chato, J. C., Souza, A. L. and Christoffersen, B. R., 1994, Evaporative characteristics of R-12, R-134a, and a mixture at low mass fluxes, ASHRAE Trans., 94-2-1, pp. 603-615 |

16 | Jung, D., Kim, Y., Ko, Y. and Song, K., 2003, Nucleate boiling heat transfer coefficients of pure halogenated refrigerants, Int. J. Refrigeration, Vol. 26, pp. 240-248 DOI ScienceOn |

17 | Cooper, M. G., 1984, Heat flow rates in saturated nucleate pool boiling-a wide-ranging examination using reduced properties, In: Advances in Heat Transfer, Academic Press, Vol. 16, pp. 157-239 |

18 | Kattan, N., Thome, J. R and Favrat, D., 1998, Flow boiling in horizontal tubes: Part 1 - Development of a diabatic two-phase flow pattern map, Journal of Heat Transfer, Vol. 120, pp. 140-147 DOI ScienceOn |

19 | Zhang, W, Hibiki, T. and Mishima, K., 2004, Correlation for flow boiling heat transfer in mini-channels, Int. J. Heat and Mass Transfer, Vol. 47, pp. 5749-5763 DOI ScienceOn |

20 | Tran, T. N., Wambsganss, M. W. and France, D. M, 1996, Small circular- and rectangularchannel boiling with two refrigerants, Int. J. Multiphase Flow, Vol. 22, No. 3, pp. 485-498 DOI ScienceOn |