Studies on Fluid-to-Fluid Modeling of Critical Heat Flux in a Helically-Coiled Tube


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An experimental study on critical heat flux (CHF) in a helically-coiled tube cooled with R-134a has been completed in order to assess present fluid-to-fluid modeling approaches. The investigated range of flow parameters for R-134a was: pressure from 0.2 to 0.5 MPa, mass flux values from 50 to 1500 kg m-2 s-1 and inlet quality from -0.2 to 0.1. The CHF data of R-134a have been compared with that of water by applying the Ahmad and the Katto modeling. The water equivalent CHF data translated from R-134a CHF data by using the two modeling approaches have shown a good agreement with the actual water CHF data from previous studies when mass flux exceeds 600 kg m-2 s-1. The results indicate that both the Ahmad and the Katto modeling can be applied only for the high mass flux conditions in helically-coiled tubes.



Advanced Materials Research (Volumes 588-589)

Edited by:

Lawrence Lim




L. Z. Tan et al., "Studies on Fluid-to-Fluid Modeling of Critical Heat Flux in a Helically-Coiled Tube", Advanced Materials Research, Vols. 588-589, pp. 1777-1780, 2012

Online since:

November 2012




[1] D.C. Groeneveld, B.P. Kiameh, S.C. Cheng, Prediction of critical heat flux (CHF) for non aqueous fluids in forced convective boiling, in: Proc. 8th Int. Heat Transfer Conf., San Francisco, California, USA, vol. 5, 1986, p.2209–2214.

[2] R.M. Tain, D.C. Groeneveld, S.C. Cheng, Limitations of the fluid-to-fluid scaling technique for critical heat flux in flow boiling, Int. J. Heat Mass Transfer 38 (1995) 2195–2208.


[3] S.Y. Ahmad, Fluid to fluid modeling of critical heat flux: A compensated Distortion Model. Int. J. Heat Mass Transfer 16 (1973) 641–662.


[4] Y. Katto, A generalized correlation of critical heat flux for the forced convection boiling in vertical uniformly heated round tubes. Int. J. Heat Mass Transfer 21 (1978) 1527–1542.


[5] M.K. Jensen, Boiling heat transfer and critical heat flux in helical coils, Ph.D. thesis, Iowa State University of Science and Technology, Ames, USA, (1980).

[6] M.K. Jensen, A.E. Bergles, Critical heat flux in helical coils with a circumferential heat flux tilt toward the outside surface, Int. J. Heat Mass Transfer 25(1982) 1383-1395.


[7] Hou Yu-Cheng, Experimental Investigation on Critical Heat Flux and Post-Dryout Heat Transfer in Horizontal Helically Coiled Tube, M. Sc. thesis, Xi'an JiaoTong University, China, (2000).