Two Dimensional Droplet Deformation on Moving Wall in a Channel

2011 ◽  
Author(s):  
H. R. Kim ◽  
H. S. Yoon ◽  
H. K. Jeong ◽  
M. Y. Ha
Keyword(s):  
Contact Angle ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Bottom Wall ◽  
Two Dimensional ◽  
Droplet Deformation ◽  
Initial State ◽  
Moving Wall ◽  
Boltzmann Method ◽  
Quiescent Fluid

A two-dimensional immiscible droplet deformation phenomena on moving wall in a channel has been simulated using lattice Boltzmann method. The behavior of the droplet is shown with the effects of the contact angle, the velocity of bottom wall, droplet size of the droplet to the displacement fluid are investigated. At the initial state, a droplet with various contact angle between the bottom wall is formatted on the wall in a quiescent fluid. When the bottom moves, the shape of droplet starts to deform. The three patterns of deformation of the droplet corresponding to the contact have been shown in the present study.

scholarly journals Contact angle measurement in lattice Boltzmann method

2018 ◽  
Vol 76 (7) ◽  
pp. 1686-1698 ◽  
Author(s):  
Binghai Wen ◽  
Bingfang Huang ◽  
Zhangrong Qin ◽  
Chunlei Wang ◽  
Chaoying Zhang
Keyword(s):  
Contact Angle ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Boltzmann Method

scholarly journals Droplet spreading and permeating on the hybrid-wettability porous substrates: a lattice Boltzmann method study

Open Physics ◽  
2016 ◽  
Vol 14 (1) ◽  
pp. 483-491 ◽  
Author(s):  
Wen-Kai Ge ◽  
Gui Lu ◽  
Xin Xu ◽  
Xiao-Dong Wang
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Droplet Spreading ◽  
Small Surface ◽  
Pore Sizes ◽  
Fluid Properties ◽  
Boltzmann Method ◽  
Porous Substrates

AbstractThe spreading and permeation of droplets on porous substrates is a fundamental process in a variety of applications, such as coating, dyeing, and printing. The spreading and permeating usually occur synchronously but play different roles in the practical applications. The mechanisms of the competition between spreading and permeation is significant but still unclear. A lattice Boltzmann method is used to study the spreading and permeation of droplets on hybrid-wettability porous substrates, with different wettability on the surface and the inside pores. The competition between the spreading and the permeation processes is studied in this work from the effects of the substrate and the fluid properties, including the substrate wettability, the porous parameters, as well as the fluid surface tension and viscosity. The results show that increasing the surfacewettability and the porosity contact angle both inhibit the spreading and the permeation processes. When the inside porosity contact angle is larger than 90° (hydrophobic), the permeation process does not occur. The droplets suspend on substrates with Cassie state. The droplets are more easily to permeate into substrates with a small inside porosity contact angle (hydrophilic), as well as large pore sizes. Otherwise, the droplets are more easily to spread on substrate surfaces with small surface contact angle (hydrophilic) and smaller pore sizes. The competition between droplet spreading and permeation is also related to the fluid properties. The permeation process is enhanced by increasing of surface tension, leading to a smaller droplet lifetime. The goals of this study are to provide methods to manipulate the spreading and permeation separately, which are of practical interest in many industrial applications.

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