Lattice Boltzmann Study of a Droplet Impinging on a Stationary Droplet on a Fixed Wall Surface with Different Wettability

doi:10.19596/j.cnki.1001-246x.8265

Abstract

Abstract:

A single-component multi-phase pseudo-potential lattice Boltzmann method is used to simulate the process of a large droplet vertically hitting a stationary small droplet on a wall with different wettability. The size ratio of the droplets is 1.5. Hydrophilic and superhydrophobic wall surfaces are studied. The droplet spreading factor and relative height are obtained. It shows that as We number increases the spreading factor of the droplet increases, the spreading diameter increases and the relative height reduces. And as We number increases, on a superhydrophobic surface, a cavity appears at the bottom of the spreading process and size of the cavity increases. In addition, as We number increases to 107.35 the droplet breaks.

Key words: lattice Boltzmann method, droplet collision, superhydrophobic surface, hydrophilic surface, spreading factor

CLC Number:

O359

Jia LIANG, Ming GAO, Lu CHEN, Dongmin WANG, Lixin ZHANG. Lattice Boltzmann Study of a Droplet Impinging on a Stationary Droplet on a Fixed Wall Surface with Different Wettability[J]. Chinese Journal of Computational Physics, 2021, 38(3): 313-323.

Figures/Tables 13

Fig.1 Verification of Laplace law

Fig.2 Verification of the contact angle

Fig.3 Variation of single droplet spreading factor with dimensionless time

Fig.4 Comparison of simulated spread factor with correlation equation in Ref.[32]

Fig.5 Comparison of simulated ξmax with theoretical result in Ref.[33]

Fig.6 Schematic of droplet collision on wall

Fig.7 Dynamic process of a large droplet impacting on a small droplet on a super-hydrophobic wall surface

Fig.8 Dynamic process of a large droplet impacting on a small droplet on a hydrophilic wall surface

Fig.9 Expansion factor changes with dimensionless time

Fig.10 Maximum spreading factor varies with We

Fig.11 Expansion factor of initial stage varies with dimensionless time

Fig.12 Relative height changes with dimensionless time

Fig.13 Velocity field before and after droplet rupture

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