| Spray cooling has received interest as a technique to dissipate extremely high heat fluxes. In this work, an experimental study of spray cooling using monodispersed droplet sprays impinging on a flat and heated surface is reported. The aim of the work was to formulate an empirical model describing the heat flux (HF) for the nucleate boiling regime that included the critical heat flux (CHF).; The resulting high heat flux was investigated as function of the droplets' diameter and velocity, mass flow rate, ambient pressure, subcooling degree and surface roughness. With values that provided a total uncertainty in the heat flux measurements of 10%, two generalized correlations were developed for the dimensionless heat Flux (HF*) and the dimensionless critical heat flux (CHF*) as functions of dimensionless parameters. For a confidence level greater than 95%, the differences between predicted and experimental HF and CHF values were less than +/-20%. |
