Lattice Boltzmann Model Simulation of Bubble Deformation and Breakup Induced by Micro-Scale Couette Flow

2021 ◽  
Author(s):  
Magzhan Atykhan ◽  
Bagdagul Kabdenova ◽  
Ernesto Monaco ◽  
Luis Rojas-Sol\xf3rzano
Keyword(s):  
Couette Flow ◽  
Lattice Boltzmann ◽  
Model Simulation ◽  
Lattice Boltzmann Model ◽  
Micro Scale ◽  
Bubble Deformation ◽  
Boltzmann Model

Lattice Boltzmann Model Simulation of Bubble Deformation and Breakup Induced by Micro-Scale Couette Flow

2020 ◽  
Author(s):  
Magzhan Atykhan ◽  
Bagdagul Kabdenova (Dauyeshova) ◽  
Luis Rojas-Solorzano ◽  
Ernesto Monaco
Keyword(s):  
Couette Flow ◽  
Lattice Boltzmann ◽  
Model Simulation ◽  
Lattice Boltzmann Model ◽  
Single Bubble ◽  
Micro Scale ◽  
Bubble Deformation ◽  
Boltzmann Model ◽  
Complex Liquid ◽  
Centroid Location

Abstract Understanding the morphology of transformation of a single bubble immersed in a liquid undergoing a shear flow is essential in predicting bubble deformation and breakup phenomena commonly found in applications involving complex liquid-gas multiphase flow. In this study, the deformation and breakup of a single bubble released in a fully developed laminar Couette flow in a micro-scale domain are evaluated under different spanwise positions, as well as under different initial diameters. The simulation is carried out using a multiphase Shan-Chen Lattice Boltzmann Model (SC-LBM). The transition between deformation and breakup experienced by the bubble is described under different Capillary (Ca) numbers, viscosity ratios and relative initial spanwise positions with respect to the channel centreline. A critical Ca number, Cac = 0.31, was found at the onset of breakup, with bubble centroid location varying as a function of the remaining parameters. The results obtained with the SC-LBM are in excellent agreement with those published in the literature.

scholarly journals A multiscale lattice Boltzmann model of macro- to micro-scale transport, with applications to gut function

2010 ◽  
Vol 368 (1921) ◽  
pp. 2863-2880 ◽  
Author(s):  
Yanxing Wang ◽  
James G. Brasseur ◽  
Gino G. Banco ◽  
Andrew G. Webb ◽  
Amit C. Ailiani ◽  
...  
Keyword(s):  
Small Intestine ◽  
Lattice Boltzmann ◽  
Mixing Layer ◽  
Passive Scalar ◽  
Lower Surface ◽  
Lattice Boltzmann Model ◽  
Outer Flow ◽  
Micro Scale ◽  
Macro Scale ◽  
Boltzmann Model

Nutrient absorption in the small intestine cannot occur until molecules are presented to the epithelial cells that line intestinal villi, finger-like protrusions under enteric control. Using a two-dimensional multiscale lattice Boltzmann model of a lid-driven cavity flow with ‘villi’ at the lower surface, we analyse the hypothesis that muscle-induced oscillatory motions of the villi generate a controlled ‘micro-mixing layer’ (MML) that couples with the macro-scale flow to enhance absorption. Nutrient molecules are modelled as passive scalar concentrations at high Schmidt number. Molecular concentration supplied at the cavity lid is advected to the lower surface by a lid-driven macro-scale eddy. We find that micro-scale eddying motions enhance the macro-scale advective flux by creating an MML that couples with the macro-scale flow to increase absorption rate. We show that the MML is modulated by its interactions with the outer flow through a diffusion-dominated layer that separates advection-dominated macro-scale and micro-scale mixed layers. The structure and strength of the MML is sensitive to villus length and oscillation frequency. Our model suggests that the classical explanation for the existence of villi—increased absorptive surface area—is probably incorrect. The model provides support for the potential importance of villus motility in the absorptive function of the small intestine.

SLIP ON CURVED BOUNDARIES IN THE LATTICE BOLTZMANN MODEL

2007 ◽  
Vol 18 (01) ◽  
pp. 15-24 ◽  
Author(s):  
LAJOS SZALMÁS
Keyword(s):  
Couette Flow ◽  
Lattice Boltzmann ◽  
Slip Flow ◽  
Distribution Functions ◽  
Lattice Boltzmann Model ◽  
Momentum Balance ◽  
Curved Boundaries ◽  
Cylindrical Couette Flow ◽  
Boltzmann Method ◽  
Boltzmann Model

We present a new boundary condition in the lattice Boltzmann method to model slip flow along curved boundaries. A requirement is formulated for the distribution functions based on the tunable momentum balance at the walls, which is shown to be equivalent to the constraint on the second moment. Numerical simulation of plane Couette flow in inclined channels and cylindrical Couette flow shows excellent agreement with the analytical results in the nearly continuum regime. Orientation effects on the velocity field are completely avoided.

scholarly journals Numerical Investigation on Physical Foaming and Decay Process Using Multicomponent Thermal Lattice Boltzmann Model

2018 ◽  
Vol 237 ◽  
pp. 02003
Author(s):  
Fu-Min Liu ◽  
An-Lin Wang
Keyword(s):  
Phase Change ◽  
Lattice Boltzmann ◽  
Phase Transfer ◽  
Model Simulation ◽  
Decay Process ◽  
Lattice Boltzmann Model ◽  
Nonlinear Phenomenon ◽  
Foamed Asphalt ◽  
Thermal Lattice Boltzmann ◽  
Boltzmann Model

Foam materials produced by physical process are common in the field of material engineering such as foamed asphalt. Considering heat and phase transfer, the complicated nonlinear phenomenon of foaming and decay process is difficult to be described numerically. In this paper, a multicomponent thermal lattice Boltzmann model for simulation of physical foaming and decay process is proposed. The model combines a thermal single-component phase change model with a multicomponent model, and the two models are verified separately. The physical foaming and decay process is solved numerically based on the proposed model. Simulation results show the influence of the distribution and content of the phase-change component on the expansion rate and decay time during physical foaming and decay process.

Hybrid lattice Boltzmann model for atmospheric flows under anelastic approximation

2021 ◽  
Vol 33 (3) ◽  
pp. 036607
Author(s):  
Y. Feng ◽  
J. Miranda-Fuentes ◽  
J. Jacob ◽  
P. Sagaut
Keyword(s):  
Lattice Boltzmann ◽  
Lattice Boltzmann Model ◽  
Atmospheric Flows ◽  
Boltzmann Model
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