The dynamic behavior of a water droplet impinging upon a heated surface was shown to be significantly different, depending on the normal momentum of the impinging droplet before impact. This experimental study focused mainly on the effects of the impinging angle of the droplet on impact dynamics and its dependence on surface temperature. At the surface temperature of the nucleate boiling regime, disintegration of the droplet did not occur, whereas the deforming droplet adhered to the surface. The liquid film was spread and contracted several times on the horizontal surface, but the expanded droplet merely slipped without noticeable contraction on the inclined surfaces. In the film boiling regime, the impinging droplet spread over the surface as a liquid film separated from the surface by the vapor produced. Depending on the magnitude of the normal momentum of droplet, disintegration into several irregular shapes of liquid elements occurred in the case of the horizontal and 30°-inclined surfaces. The impinging droplet in the case of the 60°-inclined surface did not break up and tended to recover its original spherical shape.
Experiments in Fluids – Springer Journals
Published: Oct 4, 2000
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