Lattice Boltzmann study on single solid particle promoting thin liquid film rupture

doi:10.11949/0438-1157.20200027

Abstract

Abstract:

The isothermal lattice Boltzmann method two-phase flow model combined with the particle motion model was used to study the interaction between single particles and thin liquid film. The detailed process of liquid film rupture caused by a single spherical hydrophobic particle was visually shown through simulation. The whole process of the hydrophobic particles causing the rupture of the thin liquid film can be divided into two stages. Stage 1 is the stage in which the particle contacts the liquid film and moves to the inside of the liquid film under the action of the interfacial force until the particle just penetrates the liquid film. Stage 2 is the stage in which the upper and lower liquid surface are driven by the capillary force to move on the surface of the particle. It was found that hydrophobic particle with contact angle of 106.7° caused the shortest rupture time of liquid film. When the thickness of the liquid film is greater than the depth of the liquid immersed in the equilibrium of the particles at the vapor-liquid interface, the time of hydrophobic particle leading to the rupture of the liquid film will be greatly increased.

Key words: particle, liquid film, multiphase flow, numerical simulation, lattice Boltzmann method

摘要：

采用等温格子Boltzmann方法两相流模型结合颗粒运动模型对单个颗粒与薄液膜之间的相互作用进行了研究。通过模拟直观展示了单个球形疏水颗粒导致液膜破裂的详细过程，模拟结果表明与薄液膜接触的球形疏水颗粒会导致液膜弯曲变形从而产生毛细力，毛细力会驱动液膜在颗粒表面移动从而导致液膜破裂。疏水颗粒的接触角对液膜破裂的时间有明显影响，模拟发现接触角为106.7°的疏水颗粒导致液膜破裂时间最短。此外，当液膜的厚度发生变化时，颗粒导致液膜破裂的时间也会不同。

关键词: 粒子, 液膜, 多相流, 数值模拟, 格子Boltzmann方法

CLC Number:

TQ 021.9

Xuewen LIU, Jinjing LI, Xiaojun QUAN, Wei XIONG. Lattice Boltzmann study on single solid particle promoting thin liquid film rupture[J]. CIESC Journal, 2020, 71(7): 3091-3097.

刘学文, 李金京, 全晓军, 熊伟. 单个固体颗粒促进薄液膜破裂的格子Boltzmann研究[J]. 化工学报, 2020, 71(7): 3091-3097.

Figures/Tables 7

Fig.1 Schematic of the computation domain for a single particle floating on liquid surface (a); Relationship between Gsp and contact angle with different grid numbers(b)

Fig.2 Schematic diagram of the computational domain simulating the interaction between a single solid particle and thin liquid film

Fig.3 Schematic diagram of capillary force generated by liquid surface bending

Fig.4 Two stages of liquid film rupture caused by spherical hydrophobic particle(contact angle θ = 106.7°, liquid film thickness hl*= 0.40)

Fig.5 Time distribution of two stages of liquid film rupture caused by particle with different contact angle at a given thickness (liquid film thickness hl*= 0.4)

Fig.6 Schematic diagram of liquid film drainage caused by particle(contact angle θ = 150.5°, liquid film thickness hl*= 0.45)

Fig.7 Time distribution of liquid film rupture of different thickness caused by particle with different contact angles

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