Flow Boiling in Horizontal Tubes: Part 2—New Heat Transfer Data for Five Refrigerants

Author:

Kattan N.1,Thome J. R.1,Favrat D.1

Affiliation:

1. Laboratory for Industrial Energy Systems, Department of Mechanical Engineering, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland

Abstract

A summary of a comprehensive experimental study on flow boiling heat transfer is presented for five refrigerants (R134a, R123, R402A, R404A, and R502) evaporating inside plain, horizontal, copper tube test sections. The test data were obtained for both 12.00 mm and 10.92 mm diameters using hot water as the heating source. Besides confirming known trends in flow boiling heat transfer data as a function of test variables, it was also proven that the heat flux level at the dryout point at the top of the tube in annular flow has a very significant downstream effect on heat transfer coefficients in the annular flow regime with partial dryout.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference14 articles.

1. ASHRAE Handbook, 1993, ASHRAE, Atlanta, GA.

2. Collier, J. G., and Thome, J. R., 1994, Convective Boiling and Condensation, 3rd ed., Oxford University Press, Oxford.

3. Dittus F. W. , and BoelterL. M. K., 1930, University of California (Berkeley) Publications on Engineering, Vol. 2, University of California, Berkeley, CA, p. 443443.

4. Eckels S. J. , and PateM. B., 1991, “An Experimental Comparison of Evaporation and Condensation Heat Transfer Coefficients for HFC-134a and CFC-12,” Int. J. Refrigeration, Vol. 14, pp. 70–77.

5. Gnielinski V. , 1976, “New Equations for Heat and Mass Transfer in Turbulent Pipe and Channel Flow,” Int. Chem. Eng., Vol. 16, pp. 359–368.

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