Splashing Characteristics of Monodisperse Sprays with Significant Viscosity Differences Impacting a Flat Surface |
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Authors: | In H Hwang Dong J Lee Ho Y Kim Scott C James |
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Affiliation: | 1. Department of Mechanical Engineering , Korea University Anamdong , Sungbukgu, Seoul, Korea;2. Thermal/Fluid Science &3. Engineering, Sandia National Labs , Livermore, California |
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Abstract: | Drop impingement and splashing as a function of viscosity and, to a lesser extent, temperature are examined here. The working fluid is a mixture of water and glycerin with relative mass percentages varying from 0 to 100%, which spans a viscosity range of three orders of magnitude. First, a criterion that separates “on” and “off” for splashing as a function of glycerin percentage is expressed in terms of both Weber and Reynolds numbers and its highly nonlinear behavior is a function of the change in fluid viscosity. Next, the complex splashing characteristics of a rather simple monodisperse spray injected at a pressure of 2 bars onto a flat, 2-mm-diameter aluminum cylindrical rod are examined. Spatial variations in the fraction of splashed liquid, Sauter mean diameter, splashed droplet size distribution, and splash volume fraction as a function of radial distance for these mixtures are reported. |
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Keywords: | Dissipation energy Glycerin viscosity Splash criteria Spray coating |
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