Abstract
This paper develops a new nondimensional correlation of convective heat transfer with impinging droplets on a NACA airfoil. Both average and local Nusselt numbers are determined in terms of the Reynolds number, Prandtl number, and liquid water content of the droplet flowfield. A new multiphase Reynolds parameter is developed to normalize the experimental data, along a curve fit to measured data over a range of flow conditions. In this way, a modified Hilpert correlation can be extended to include effects of droplet-air interactions on the effective heat transfer coefficient. Droplet impact on the airfoil surface affects the structure of the thermal boundary layer, as well as energy exchange through kinetic energy of impinging droplets and a thin flowing film along the surface. Using the empirical correlation with a multiphase Reynolds parameter, this paper demonstrates that effects of varying both air velocity and liquid water content can be normalized into a single modified Hilpert correlation. Results are presented at varying Reynolds numbers and applications to icing problems are discussed.
Published Version
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