Saturated Flow Boiling Heat Transfer Correlation

4 Saturated Flow Boiling Heat Transfer Correlation 

The dryout incipience correlation has been presented in the previous section. The generalized correlation for predryout two-phase heat transfer coefficient associated with saturated flow boiling in mini-/microchannels is discussed in the present section. Kim and Mudawar 

X++ = Lockhart-Martinelli parameter based on turbulent liquid-turbulent vapor fiows 

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Kim S and Mudawar I 2013b Universal approach to predicting saturated flow boiling heat transfer in mini/micro-channels-Part I. Dryout incipience quahty. Int. J. Heat Mass Transfer, 64, pp. 1226-1238. Kim S, Kim J, and Mudawar I 2012 Flow condensation in parallel micro-channels-Part I experimental results and assessment of pressure drop correlations. Int. J. Heat Mass Transfer, 55, pp. 971-983. Lee J and Mudawar I 2005 Two phase flow in high heat flux micro channel heat sink for refrigeration cooling apphcations Part E-heat transfer characteristics. Int. J. Heat Mass Transfer, 48, pp. 941-955. Lee J and Mudawar 12009 Critical heat flux for sub-cooled flow bofling in micro-channel heat sinks. Int. J. Heat Mass Transfer, 52, pp. 3341-3352. 

Kandlikar, S. G., 1989a, A General Correlation for Saturated Two-Phase Flow Boiling Heat Transfer inside Horizontal and Vertical Tubes, Trans. ASME, J. Heat Transfer 112 219 228. (4)... 

Typical flow pattern for flow boiling are shown in Fig. 5. For subcooled boiling and high liquid flow rate, the observed bubble detachment size is smaller than the gap size. The treatment of the data showed that correlation [26] obtained for a large tube flow boiling can be applied to predict subcooled flow boiling heat transfer in a confined space. For saturated flow, the vapor bubbles have a tendency to merge and produce the... 

Chen, J. C., A Correlation for Boiling Heat Transfer to Saturated Fluids in Convection Flow, Heat Trans. Div. ASME Conference, Boston (1963), Paper No. 63-HT-34. 

Figure 5.47 shows a plot of the ratio of the experimental heat transfer coefficient obtained by Bao et al. (2000) divided by the predicted values of Chen (1966) and Gungor and Winterton (1986) for heat transfer to saturated flow boiling in tubes versus liquid Reynolds number. It can be seen that both methods provide reasonable predictions for Rcls > 500, but that both overpredict the heat transfer coefficient at lower values of Rols- For comparison it was assumed that the boiling term of these correlations is zero. 

Celata GP (ed) (2004) Heat transfer and fluid flow in micro-channels. Bergel, New York Chen JC (1966) Correlation for boiling heat transfer to saturated fluids in convective flow. Ind Eng Chem Process Des Dev 5 322-329... 

Carey van P (1992) Liquid-vapor phase-change phenomena. An introduction to the thermophysics of vaporization and condensation processes in heat transfer equipment. Hemisphere, New York Celata GP, Cumo M, Mariani A (1997) Experimental evaluation of the onset of subcooled flow boiling at high liquid velocity and subcoohng. Int J Heat Mass Transfer 40 2979-2885 Celata GP, Cumo M, Mariani A (1993) Burnout in highly subcooled water flow boiling in small diameter tubes. Int J Heat Mass Transfer 36 1269-1285 Chen JC (1966) Correlation for boiling heat transfer to saturated fluids in convective flow. Ind Eng Chem Process Des Develop 5 322-329... 

Chen, J.C. 1963. A correlation for boiling heat transfer to saturated fluids in convective flow. ASME paper 63-HT-34. 

Liu Z, Winterton RHS (1991) A general correlation for saturated and subcooled flow boiling in tubes and annuli, based on a nucleate pool boiling equation. Int J Heat Mass Transfer 34 2759-2766... 

Liu, Z., and R. H. S. Winterton, 1991, A General Correlation for Saturated and Subcooled Flow Boiling in Tubes and Annuli Based on a Nucleate Pool Boiling Equation, Int. J. Heat Mass Transfer 34(11) 2759 2766. (4)... 

The knowledge about the transition point or location of dryout incipience is essential as the dryout exhibits substantial reduction in the heat transfer coefficient. Various parameters, that is, working fluid, heat flux, mass velocity, channel diameter, and saturation pressure, affect the incipience quality for dryout. Kim and Mudawar (2013a) proposed a correlation for dryout incipience quality of saturated boiling mini-/microchannel flow as... 

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