A forced convection analysis that emphasizes heat transfer phenomena at the heat exchange surface during spray cooling was used to develop a CHF correlation by recasting the multiphase energy balance equation in the form of the Nusselt number. Although multiphase effects are accounted for, the correlation primarily applies to flow scenarios that are single phase dominated. Test cases from previously published and unpublished studies by various researchers were included. Results for comparison of predicted vs. measured CHF are presented for several different working fluids. Predictions for the modeled cases show an average mean error of ±18% with 88% of the data predicted within a range of ±30%. The correlation applies to both gassy and degassed conditions for perfluorocarbons, water, and methanol.

Volume Subject Area:
Spray and Droplet Heat Transfer
Topics:
Cooling, Critical heat flux, Energy conservation, Heart failure, Sprays, Energy budget (Physics), Errors, Flow (Dynamics), Fluids, Forced convection, Heat, Heat transfer, Methanol, Water
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