Lattice Boltzmann simulations of a single <i>n</i>-butanol drop rising in water

Komrakova, Alexandra; Eskin, Dmitry; Derksen, J. J.

doi:10.1063/1.4800230

Cited by 19 publications

(10 citation statements)

References 52 publications

(101 reference statements)

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“…Watanabe and Ebihara [27] used two-component two-phase LBM to simulate the process of drop rising. Komrakova et al [28] performed numerical simulation of n-butanol drop rising in water using the multiphase LBM, the simulation results they obtained agree well with the experimental data.…”

Section: Introductionmentioning

confidence: 67%

“…The heights of the computational domain were set to Reynolds number as derived from Clift et al [12] The steady state Reynolds numbers reported in Figure 2A are within 0.2% of = 5.6 so that the impact of height on rising velocity can be negligible, which is consistent with the three-dimensional simulation. [28] The flow map due to Clift et al [12] indicates a Reynolds number of 5.0 for the specific values for and where it should be noted that this map is based on (three-dimensional) experimental data.…”

Section: Domain Size Influencementioning

confidence: 99%

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Lattice Boltzmann phase field simulations of droplet slicing

Liu

et al. 2021

Can J Chem Eng

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We have performed two and three-dimensional phase field simulations using the lattice-Boltzmann method of liquid drops rising through a continuous phase liquid under the influence of buoyancy. In their upward motion the drops encounter a knife that is placed with the purpose of slicing the drops in two. A range of scenarios has been observed when the drop hits the knife and it has been investigated how the type of scenario depends on the dimensionless parameters governing the motion and slicing of the drop: the Eötvös number, the Morton number and the ratio of the droplet size and the width of the knife. We studied symmetric and asymmetric encounters between drop and knife and kept track of the size distribution of the resulting fragments.

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Section: Introductionmentioning

confidence: 67%

Section: Domain Size Influencementioning

confidence: 99%

Lattice Boltzmann phase field simulations of droplet slicing

Liu

et al. 2021

Can J Chem Eng

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“…It can be seen that at the beginning of the circulating and oscillating regimes, the deviations of the VOF method are less than the level set. It has been previously reported that the simulation rise time of the study of Bertakis et al (2010), was too short to reach terminal velocity (Engberg and Kenig, 2014;Komrakova et al, 2013). They concluded that their large deviations from the Bertakis et al (2010) terminal velocity data were due to not considering a sufficiently long rise time in Bertakis et al (2010) for the oscillating large drops.…”

Section: Droplets Transient and Terminal Velocitiesmentioning

confidence: 90%

“…The different rise velocities had been previously shown by Wegener et al (2010). Komrakova et al (2013) studied the rising of n-butanol drops of 1-4 mm drop size range with both stationary and moving reference frame. Deviations of 5% for terminal velocities of smaller drops and up to 20% for large oscillating drops were reported using the Lattice-Boltzmann technique.…”

Section: Introductionmentioning

confidence: 99%

Vof Simulation of Single Rising Drops in Three Liquid-Liquid Extraction Systems Using CSF and CSS Interfacial Force Models

Roshdi

Kasiri

Rahbar-Kelishami

2018

Braz. J. Chem. Eng.

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In liquid-liquid extraction contractors, mass transfer and stage efficiency are closely related to drop hydrodynamics. In the present study, hydrodynamic simulation of three standard liquid-liquid extraction systems recommended by the EFCE (European Federation of Chemical Engineering) has been investigated. Toluene/water, n-butyl acetate/water, and n-butanol/water with different drop diameters were considered in the simulations, representing systems with high, medium, and low interfacial tension respectively. In the current research, for the first time simulations have been carried out using the VOF-PLIC (Volume of Fluid-Piecewise Linear Interface Calculation) model, implementing two surface tension force models of CSS (Continuum Surface Stress) and CSF (Continuum Surface Force) as a source term in the momentum equation. Simulations have been carried out in an axisymmetric geometry with a moving droplet in the static zone. The stages of droplet acceleration, deformation, and stability in terms of shape and velocity have been captured through simulations. Simulation results show that the average relative error reduces by using the CSS model and the most enhanced effect is observed in the toluene/water system, followed by the n-butyl acetate/water and n-butanol/water systems, respectively. This is due to higher parasitic current effects in the highest surface tension system (toluene/water). The onset of oscillations in the toluene/water system was correctly predicted by the CSS model, while the CSF model could not. Droplet shapes, aspect ratio, terminal and transient velocity and streamlines were also reported in the two surface tension models and compared.

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“…The implementation of the method was verified and then validated by simulation of the gravity‐driven rise of a single drop, drop deformation, and breakup in a simple shear flow . Then it was applied to simulations of liquid‐liquid dispersions .…”

Section: Introductionmentioning

confidence: 99%

Single drop breakup in turbulent flow

Komrakova

2019

Can J Chem Eng

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The breakup process of a single drop in homogeneous isotropic turbulence was studied using direct numerical simulations. A diffuse interface free energy lattice Boltzmann method was applied. The detailed visualization of the breakup process confirmed breakup mechanisms previously outlined such as initial, independent, and cascade breakups. High-resolution simulations allowed to visualize another drop breakup mechanism, burst breakup, which occurs when the mother drop has a large volume, and the flow is highly turbulent. The simulations indicate that the type of the breakup mechanism is a strong function of mother drop size and energy input. Large mother drops in highly turbulent flow fields are more likely to burst, producing a large number of drops of the size close to the Kolmogorov length scale. Small drops in moderate turbulence tend to break only once (initial breakup). The interfacial energy of a drop was tracked as a function of time during drop deformation and breakage. The maximum energy level of the deformed mother drop was compared to commonly used estimates of critical energy necessary to break a drop. Our results show that these reference levels of critical energy are usually underestimated. Moreover, in some cases even if the critical energy level was exceeded, the drop did not break because the time of the interaction between the drop and the eddies was not enough to finish the breakup. The numerical insight presented here can be used as a guideline for the selection of assumptions and simplifications behind breakup kernels.

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Lattice Boltzmann simulations of a single n-butanol drop rising in water

Cited by 19 publications

References 52 publications

Lattice Boltzmann phase field simulations of droplet slicing

Lattice Boltzmann phase field simulations of droplet slicing

Vof Simulation of Single Rising Drops in Three Liquid-Liquid Extraction Systems Using CSF and CSS Interfacial Force Models

Single drop breakup in turbulent flow

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