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Ellipsoidal drop impact on a solid surface for rebound suppression

Published online by Cambridge University Press:  04 July 2014

Sungchan Yun  and
Geunbae Lim
Sungchan Yun
Affiliation:
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 790-784, Republic of Korea
Geunbae Lim*
Affiliation:
Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Nam-gu, Pohang 790-784, Republic of Korea
*
†Email address for correspondence: [email protected]
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Abstract

Non-axisymmetric drops can significantly alter impact dynamics via rebound suppression when compared to axisymmetric drops. In this study, we focus on ellipsoidal drop impact on a non-wetting surface and investigate the effects of the geometric aspect ratio ($\def \xmlpi #1{}\def \mathsfbi #1{\boldsymbol {\mathsf {#1}}}\let \le =\leqslant \let \leq =\leqslant \let \ge =\geqslant \let \geq =\geqslant \def \Pr {\mathit {Pr}}\def \Fr {\mathit {Fr}}\def \Rey {\mathit {Re}}{AR}$) and the Weber number (${\mathit{We}}$) on the dynamics and outcomes of impacts, both experimentally and numerically. Non-axisymmetric spreading features are characterized by scrutinizing the maximal extensions along the $x$-axis ($D_{mx}$) and $y$-axis ($D_{my}$) with respect to ${AR}$ and ${\mathit{We}}$. The ratio of the maximal extensions depends strongly on ${AR}$, following our scaling relation $D_{mx}/D_{my} \sim {AR}^{1/2}$. Experimental and numerical studies show that increasing ${AR}$ induces a high degree of axis switching during retraction, thereby resulting in the prevention of drop rebound, where axis switching denotes alternate expansion and contraction along the principal axes. We determine the transition between rebound and deposition (rebound suppression) over the ${AR}$ and ${\mathit{We}}$ domains and discuss the transition based on a non-axial distribution of the kinetic energy. The understanding of ellipsoidal drop impacts will potentially provide applications to surface patterning, cleaning, and cooling.

JFM classification

Drops and Bubbles: Drops Interfacial Flows (free surface): Interfacial Flows (free surface)
Type
Papers
Information
Journal of Fluid Mechanics , Volume 752 , 10 August 2014 , pp. 266 - 281
Copyright
© 2014 Cambridge University Press 

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