Simulations of contact angle hysteresis effects in droplet sliding on inclined isothermal surfaces and droplet evaporating on heated horizontal surfaces by a lattice Boltzmann method with a variable solid-fluid interaction strength scheme

2022 ◽  
Vol 186 ◽  
pp. 122454
Author(s):  
B.B. Kazemian ◽  
P. Cheng
Keyword(s):  
Contact Angle ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Contact Angle Hysteresis ◽  
Interaction Strength ◽  
Boltzmann Method ◽  
Fluid Interaction

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.

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 Drop formation in cross-junction micro-channel, using lattice Boltzmann method

2018 ◽  
Vol 22 (2) ◽  
pp. 909-919 ◽  
Author(s):  
Kayvan Fallah ◽  
Moahammad Rahni ◽  
Alireza Mohammadzadeh ◽  
Mohammad Najafi
Keyword(s):  
Contact Angle ◽  
Lattice Boltzmann Method ◽  
Flow Rate ◽  
Lattice Boltzmann ◽  
Rate Ratio ◽  
Viscosity Ratio ◽  
Flow Rate Ratio ◽  
Drop Formation ◽  
Micro Channels ◽  
Boltzmann Method

Drop formation in cross-junction micro-channels is numerically studied using the lattice Boltzmann method with pseudo-potential model. To verify the simulation, the results are compared to previous numerical and experimental data. Furthermore, the effects of capillary number, flow rate ratio, contact angle, and viscosity ratio on the flow patterns, drop length, and interval between drops are investigated and highlighted. The results show that the drop forming process has different regimes, namely, jetting, drop, and squeezing regimes. Also, it is shown that increasing in the flow rate ratio in the squeezing regime causes increment in drop length and decrement in drops interval distance. On the other hand, the drops length and the interval between the generated drops increase as contact angle increases. Also, the drop length and distance between drops is solely affected by viscosity ratio.

Application of the Lattice Boltzmann Method for Fluid Flow around Complex Geometry

2014 ◽  
Vol 554 ◽  
pp. 230-235
Author(s):  
Leila Jahanshaloo ◽  
Nor Azwadi Che Sidik ◽  
Emad Kermani
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Complex Geometry ◽  
Drag Forces ◽  
Lattice Boltzmann Simulations ◽  
Lattice Arrangement ◽  
Boundary Treatments ◽  
Lift And Drag ◽  
Boltzmann Method ◽  
Fluid Interaction

In recent years, several strategies have been proposed to deal with complex geometry to study particle-fluid interaction using lattice Boltzmann method. Curved boundary treatments have been suggested to improve the accuracy of the stair-shaped approximation in conventional lattice Boltzmann simulations. This paper presents numerical analysis of three interpolation methods for confined flow around blockage positioned inside a channel. A two-dimensional nine velocity lattice arrangement was chosen to discretize the fluid domain and single relaxation time technique is applied in this study. The results are presented in terms of velocity contour, lift and drag forces variation for three different shapes of blockage. The simulations results are then compared with those obtained using the three different interpolating treatments. Some of these methods show more adaptability for force evaluating on distinct surfaces.

Sign in / Sign up

Export Citation Format

Share Document