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http://dx.doi.org/10.6112/kscfe.2016.21.4.090

NUMERICAL ANALYSIS OF THE IMPACTING AND SPREADING DYNAMICS OF THE ELLIPSOIDAL DROP ON THE PERFECT NON-WETTING SOLID SURFACE  

Yun, S. (Dept. of Mechanical Engineering, Korea Nat'l. Univ. of Transportation)
Publication Information
Journal of computational fluids engineering / v.21, no.4, 2016 , pp. 90-95 More about this Journal
Abstract
Leidenfrost drops with ellipsoidal shaping can control the bouncing height by adjusting the aspect ratio(AR) of the shape at the moment of impact. In this work, we focus on the effect of the AR and the impact Weber number(We) on the non-axisymmetrical spreading dynamics of the drop, which plays an important role in the control of bouncing. To understand the impact dynamics, the numerical simulation is conducted for the ellipsoidal drop impact upon the perfect non-wetting solid surface by using volume of fluid method, which shows the characteristics of the spreading behavior in each principal axis. As the AR increases, the drop has a high degree of the alignment into one principal axis, which leads to the consequent suppression of bouncing height with shape oscillation. As the We increases, the maximum spreading diameters in the principal axes both increase whereas the contact time on the solid surface rarely depends on the impact velocity at the same AR. The comprehensive understanding of the ellipsoidal drop impact upon non-wetting surface will provide the way to control of drop deposition in applications, such as surface cleaning and spray cooling.
Keywords
Drop Impact; Spreading Dynamics; Drop Bouncing;
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Times Cited By KSCI : 1  (Citation Analysis)
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