Lattice Boltzmann study on the dynamics of successive droplets impact on a solid surface
Three dimensional computations on successive droplet impingement on a solid surface are reported. A high-density ratio based lattice Boltzmann model is employed for the present two phase computations and a geometric-based contact angle formulation is used to model the moving contact line. The focus...
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Published in | Chemical engineering science Vol. 145; pp. 181 - 195 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier Ltd
12.05.2016
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Subjects | |
Online Access | Get full text |
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Summary: | Three dimensional computations on successive droplet impingement on a solid surface are reported. A high-density ratio based lattice Boltzmann model is employed for the present two phase computations and a geometric-based contact angle formulation is used to model the moving contact line. The focus of the present work is on the impact behaviour and the interaction dynamics between the impinging droplets with an initial gap. The effects of trailing drop velocity, surface wettability, drop viscosity and surface tension on the time-dependent dynamics are investigated during the impingement process. Two different transient interaction modes are observed for different velocity ratios. With increase in advancing contact angle, it is observed that primary spreading increases in the case of in-phase mode of collision. Effect of eccentricity, through the offset between the droplets, is found to result in an asymmetric evolution of droplet morphologies. Passive particle tracers are seeded inside the droplets to visualize mixing process as a time sequence of closely interacting droplets during the impact with a solid surface.
•Three-dimensional LBM simulations on interactions of successively impacting droplets.•Mechanism of two different interaction modes has been investigated for varying trailing drop velocities.•Influence of contact angle hysteresis on the two interaction modes has been investigated.•Internal flow analysis of the interacting droplets for offset ratios. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0009-2509 1873-4405 |
DOI: | 10.1016/j.ces.2016.02.017 |