Three dimensional simulations of droplet formation in symmetric and asymmetric T-junctions using the color-gradient lattice Boltzmann model

Lattice Boltzmann simulation of immiscible two‐phase flow with capillary valve effect in porous media

“…This method can handle arbitrarily complex geometries of porous media with great ease, but it was reported to produce incorrect outcomes, especially when the contact angle is less than 908, because of unphysical mass transfer along the boundary [Leclaire et al, 2016]. Several strategies [Ba et al, 2013[Ba et al, , 2015Liu et al, 2015a;Liu and Zhang, 2015;Leclaire et al, 2016] have been proposed to decrease spurious velocities around the contact line and enhance the accuracy of modeling contact angle. However, they either suffer from the difficulty of dealing with curved solid boundaries [Ba et al, 2013[Ba et al, , 2015Liu et al, 2015a;Liu and Zhang, 2015] or may lead to nonsymmetric results (which arise from the least squares interpolation scheme) for a physically symmetric problem [Leclaire et al, 2016].…”

Minimized Capillary End Effect During CO2 Displacement in 2‐D Micromodel by Manipulating Capillary Pressure at the Outlet Boundary in Lattice Boltzmann Method

“…The inherent wall phase field controls the contact angle at the fluid‐solid interface in the RK model (Latva‐Kokko & Rothman, ), but it is not recommended for use in a simulation involving various densities and viscosities. A geometrical formulation scheme for the wetting condition has been suggested to improve the accuracy of the interface motion for a high viscosity ratio; however, it is of limited use in the case of a flat wall due to the implementation of a central difference scheme (Ba et al, ; Liu et al, ). Therefore, we suggest a geometrical formulation using a weighted average of the directional derivative working at the nonflat surface.…”

Effects of wall velocity slip on droplet generation in microfluidic T-junctions

“…20 An enormous amount of research reveals that the viscosity ratio l and ow rate ratio Q of the dispersed phase to continuous phase, surface tension between the two phases, and contact angle have signicant inuences on droplet generation. [21][22][23][24] Whereas the ratio of surface to volume is high, the interaction between solid wall and uids can signicantly affect droplet generation 25,26 and many researchers have found that the geometry of the Tjunction is a crucial factor in droplet formation. 27,28 For the interaction between uid and wall, most researchers employed the contact angle to represent the wetting property in two-phase ow.…”