Heat transfer effectiveness of saturated drops in the nonwetting regime impinging on a heated surface

A theoretical analysis of impact dynamics and heat transfer is performed on single, deformable saturated drops to determine heat transfer effectivenes s, using idealized shapes to model the deformation. Numerical results are o btained for various liquid drops in the nonwetting regime with diameters of 0.22 to 4.0 mm, wall superheat temperatures of 200 to 600 K and Weber numb ers of 12.3 to 50. The drop heat transfer effectiveness is expressed in the form of a correlation equation of four dimensionless parameters, including Weber, Bond and Prandtl numbers, and a new parameter which can be interpre ted as the ratio of the inertial force induced by the accelerating vapor fl ow inside the superheated vapor layer to the elastic restitution force of t he drop itself due to surface tension forces. The correlation equation agre es well with the existing experimental data in the absence of air entrainme nt and drop subcooling.