scholarly journals A lattice Boltzmann method for axisymmetric multicomponent flows with high viscosity ratio

2016 ◽  
Vol 327 ◽  
pp. 873-893 ◽  
Author(s):  
Haihu Liu ◽  
Lei Wu ◽  
Yan Ba ◽  
Guang Xi ◽  
Yonghao Zhang
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Viscosity Ratio ◽  
High Viscosity ◽  
Multicomponent Flows ◽  
Boltzmann Method

Simulation of interfacial waves of two-layer flows through phase field lattice Boltzmann method

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840056
Author(s):  
Jiang-Yan Shao ◽  
Chang Shu
Keyword(s):  
Lattice Boltzmann Method ◽  
Liquid Layer ◽  
Phase Field ◽  
Lattice Boltzmann ◽  
Viscosity Ratio ◽  
Early Stage ◽  
Plane Channel ◽  
Wave Growth ◽  
Layer Height ◽  
Boltzmann Method

Simulation of the interfacial wave growth in a plane channel is performed by a phase field lattice Boltzmann method (LBM) in this work. The numerical results are validated against linear theory analysis. The influence of viscosity ratio and liquid layer height on the wave initiation is studied Results show that the wave grows slower with increasing viscosity ratio. On the other hand, the wave growth rate has more complex relationships with the liquid layer height. It is also found that there is a critical liquid layer height that prompts the strongest wave growth. Besides the linear characteristics during the early stage, nonlinear interfacial changes such as forming of ligament and droplets are also captured in this work.

The investigation of the viscous fingering phenomenon of immiscible fluids displacement by the Lattice Boltzmann method

2020 ◽  
Vol 98 (7) ◽  
pp. 650-659
Author(s):  
Peisheng Li ◽  
Chengyu Peng ◽  
Peng Du ◽  
Ying Zhang ◽  
Boheng Dong ◽  
...  
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Viscosity Ratio ◽  
Viscous Fingering ◽  
Immiscible Fluids ◽  
Lattice Boltzmann Model ◽  
Fluid Accumulation ◽  
Sweep Efficiency ◽  
Fingering Phenomena ◽  
Boltzmann Method

In this paper, the viscous fingering phenomena of two immiscible fluids with a large viscosity ratio was simulated by the Lattice Boltzmann method. The Rothman–Keller Lattice Boltzmann model was applied to study the viscous fingering phenomena in a microchannel where the high viscosity fluids were displaced by low viscosity fluids. We have investigated the influences of parameters such as viscosity ratio (M), surface wettability, capillary number (Ca), and Reynolds number (Re) on finger structures, breakthrough time (Ts), and areal sweep efficiency (Se). In particular, the effects of surface tension and large viscosity ratio on the phenomenon of fluid accumulation were intensively studied. The simulation results showed that the fluid accumulation became more obvious gradually with the increase of M, which led to more serious displacement effects. Moreover, Se increased as the contact angle increased. Besides, as the viscous fingering phenomenon weakened, the phenomenon of fluid accumulation became more evident. Furthermore, the finger pattern had a tendency to increase as the value of Ca and Re increased, and the phenomenon of fluid accumulation decreased with the decrease of Ts and Se.

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.

scholarly journals Numerical simulations of the behaviour of a drop in a square pipe flow using the two-phase lattice Boltzmann method

2011 ◽  
Vol 369 (1945) ◽  
pp. 2528-2536 ◽  
Author(s):  
Yuta Kataoka ◽  
Takaji Inamuro
Keyword(s):  
Lattice Boltzmann Method ◽  
Pipe Flow ◽  
Lattice Boltzmann ◽  
Weber Number ◽  
Viscosity Ratio ◽  
Reynolds Numbers ◽  
Immiscible Fluids ◽  
Two Phase ◽  
Pipe Section ◽  
Boltzmann Method

The lattice Boltzmann method for multi-component immiscible fluids is applied to simulations of the behaviour of a drop in a square pipe flow for various Reynolds numbers of 10< Re <500, Weber numbers of 0< We <250 and viscosity ratios of η =1/5, 1, 2 and 5. It is found that, for low Weber numbers, the drop moves straight along a stable position on the diagonal line of the pipe section, and it moves along the centre axis of the pipe for larger Weber numbers. We obtain the boundary of the two different behaviours of the drop in terms of Reynolds number, Weber number and viscosity ratio.

Sign in / Sign up

Export Citation Format

Share Document