Lattice Boltzmann simulations of droplet dynamics in two-phase separation with temperature field

2020 ◽  
Vol 32 (7) ◽  
pp. 073312 ◽  
Author(s):  
Ningguang Chen ◽  
Zunlong Jin ◽  
Yonghao Liu ◽  
Peng Wang ◽  
Xiaotang Chen
Keyword(s):  
Temperature Field ◽  
Phase Separation ◽  
Lattice Boltzmann ◽  
Two Phase ◽  
Droplet Dynamics ◽  
Lattice Boltzmann Simulations

Lattice-Boltzmann Simulations of Complex Fluids

1997 ◽  
Vol 08 (04) ◽  
pp. 783-792 ◽  
Author(s):  
G. Gonnella ◽  
E. Orlandini ◽  
J. M. Yeomans
Keyword(s):  
Free Energy ◽  
Fluid Flow ◽  
Phase Separation ◽  
Lattice Boltzmann ◽  
Stokes Equations ◽  
Positive Curvature ◽  
Navier Stokes ◽  
Two Phase ◽  
Lattice Boltzmann Simulation ◽  
Lattice Boltzmann Simulations

We show that by including thermodynamic functions derived from a chosen free energy in a lattice-Boltzmann simulation of fluid flow it is possible to ensure that the fluid relaxes to a well-defined equlilibrium corresponding to the minimum of the input free energy. Two examples are given of phase separation in a binary fluid: bulk two-phase coexistence and a lamellar phase stabilised by a competition between negative surface tension and positive curvature energy. The lattice-Boltzmann framework simulates the Navier–Stokes equations of fluid flow and hence allows investigation of the effects of hydrodynamics on the kinetics of phase separation and on the rheology of the ordered structures.

Effect of the Wettability on Two-Phase Flow Inside Porous Medium at Nanoscale: Lattice Boltzmann Simulations

2017 ◽  
Vol 17 (9) ◽  
pp. 6620-6625
Author(s):  
Daliang He ◽  
Yakang Jin ◽  
Qingzhong Xue ◽  
Xuefeng Liu ◽  
Shuangfang Lu
Keyword(s):  
Porous Medium ◽  
Lattice Boltzmann ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Lattice Boltzmann Simulations

LATTICE BOLTZMANN SIMULATIONS OF DROP–DROP INTERACTIONS IN TWO-PHASE FLOWS

2005 ◽  
Vol 16 (01) ◽  
pp. 25-44 ◽  
Author(s):  
KANNAN N. PREMNATH ◽  
JOHN ABRAHAM
Keyword(s):  
Shear Flow ◽  
Lattice Boltzmann ◽  
Flow Model ◽  
Numerical Solutions ◽  
Three Dimensional ◽  
Drop Deformation ◽  
Simple Shear Flow ◽  
Two Phase ◽  
Lattice Boltzmann Simulations ◽  
Boltzmann Method

In this paper, three-dimensional computations of drop–drop interactions using the lattice Boltzmann method (LBM) are reported. The LBM multiphase flow model employed is evaluated for single drop problems and binary drop interactions. These include the verification of Laplace–Young relation for static drops, drop oscillations, and drop deformation and breakup in simple shear flow. The results are compared with experimental data, analytical solutions and numerical solutions based on other computational methods, as applicable. Satisfactory agreement is shown. Initial studies of drop–drop interactions involving the head-on collisions of drops in quiescent medium and off-center collision of drops in the presence of ambient shear flow are considered. As expected, coalescence outcome is observed for the range of parameters studied.

Effects of Inertia and Viscosity on Single Droplet Deformation in Confined Shear Flow

2013 ◽  
Vol 13 (3) ◽  
pp. 706-724 ◽  
Author(s):  
Samaneh Farokhirad ◽  
Taehun Lee ◽  
Jeffrey F. Morris
Keyword(s):  
Reynolds Number ◽  
Shear Flow ◽  
Viscous Fluid ◽  
Lattice Boltzmann ◽  
Viscosity Ratio ◽  
Diffuse Interface ◽  
Single Droplet ◽  
Droplet Deformation ◽  
Droplet Dynamics ◽  
Lattice Boltzmann Simulations

AbstractLattice Boltzmann simulations based on the Cahn-Hilliard diffuse interface approach are performed for droplet dynamics in viscous fluid under shear flow, where the degree of confinement between two parallel walls can play an important role. The effects of viscosity ratio, capillary number, Reynolds number, and confinement ratio on droplet deformation and break-up in moderately and highly confined shear flows are investigated.

scholarly journals Lattice Boltzmann simulations of incompressible liquid–gas systems on partial wetting surfaces

2011 ◽  
Vol 369 (1945) ◽  
pp. 2510-2518 ◽  
Author(s):  
Ching-Hsiang Shih ◽  
Cheng-Long Wu ◽  
Li-Chen Chang ◽  
Chao-An Lin
Keyword(s):  
Lattice Boltzmann ◽  
Density Ratio ◽  
Three Dimensional ◽  
Bond Number ◽  
Two Phase ◽  
Droplet Shape ◽  
Gas Density ◽  
Partial Wetting ◽  
Lattice Boltzmann Simulations ◽  
Large Density Ratio

A three-dimensional Lattice Boltzmann two-phase model capable of dealing with large liquid and gas density ratios and with a partial wetting surface is introduced. This is based on a high density ratio model combined with a partial wetting boundary method. The predicted three-dimensional droplets at different partial wetting conditions at equilibrium are in good agreement with analytical solutions. Despite the large density ratio, the spurious velocity around the interface is not substantial, and is rather insensitive to the examined liquid and gas density and viscosity ratios. The influence of the gravitational force on the droplet shape is also examined through the variations of the Bond number, where the droplet shape migrates from spherical to flattened interface in tandem with the increase of the Bond number. The predicted interfaces under constant Bond number are also validated against measurements with good agreements.

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