Experimental study on the behavior of the drop impinging upon a hot surface (2nd report, Effect of the liquid properties on the behavior of a drop)

Abstract

The behavior of the drop impinging upon a hot surface has been investigated experimentally in this paper. Putting importance on the dynamic aspects, the effects provided by the drop's viscosity and the surface tension on the variation of disintegration and deformation of the drops have been examined. The conclusions are summarized as follows; For drops with kinetic viscosity of upto approximately 60 mm2/s, the disintegration patterns can be identified by We number, even if the surface tension and/or the impinging velocity differ. Also, the non-dimensional maximum spreading diameter dsmax/di and the non-dimensional maximum apparent contact diameter dcmax/di and the non-dimensional maximum apparent contact diameter dcmax/di can be categorized soley under the We number. But the viscosity increases and becomes more than approximately 80 mm2/s, the effect of viscosity on the variation in disintegration patterns and deformation becomes more marked and then cannot be identified solely by We number. In this study, the experimental equations for dsmax/di have been defined by We number and viscosity.