Boundary conditions with adjustable slip length for the lattice Boltzmann simulation of liquid flow

Yang, Liuming; Yu, Yang; Hou, Guoxiang; Wang, Kai; Xiong, Yeping

doi:10.1016/j.compfluid.2018.08.002

Cited by 34 publications

(13 citation statements)

References 40 publications

(89 reference statements)

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“…Those, in turn, can be described by the Boltzman kinetic model with the aid of numeric simulation methods, such as the Lattice Boltzmann Method (LBM), the Molecular Dynamics (MD) method, the Direct Simulation of Monte Carlo (DSMC) [11,12] and the Computer Fluid Dynamics (CFD) method. The LBM method derives from the Boltzmann equation without the continuum assumption, and is a common tool used in numerical studies [13]. Nevertheless, the Navier-Stokes method with the first-order slip boundary condition can give results consistent with those obtained by numerical simulations based on the Boltzman model for fluids with a Knudsen number between 0.01 and 0.1.…”

Section: Introductionmentioning

confidence: 89%

Numerical Optimization of a Microchannel Geometry for Nanofluid Flow and Heat Dissipation Assessment

et al. 2021

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In this study, a numerical approach was carried out to analyze the effects of different geometries of microchannel heat sinks on the forced convective heat transfer in single-phase flow. The simulations were performed using the commercially available software COMSOLMultiphysics 5.6®(Burlington, Massachusetts, United States) and its results were compared with those obtained from experimental tests performed in microchannel heat sinks of polydimethylsiloxane (PDMS). Distilled water was used as the working fluid under the laminar fluid flow regime, with a maximum Reynolds number of 293. Three sets of geometries were investigated: rectangular, triangular and circular. The different configurations were characterized based on the flow orientation, type of collector and number of parallel channels. The main results show that the rectangular shaped collector was the one that led to a greater uniformity in the distribution of the heat transfer in the microchannels. Similar results were also obtained for the circular shape. For the triangular geometry, however, a disturbance in the jet impingement was observed, leading to the least uniformity. The increase in the number of channels also enhanced the uniformity of the flow distribution and, consequently, improved the heat transfer performance, which must be considered to optimize new microchannel heat sink designs. The achieved optimized design for a heat sink, with microchannels for nanofluid flow and a higher heat dissipation rate, comprised a rectangular collector with eight microchannels and vertical placement of the inlet and outlet.

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Section: Introductionmentioning

confidence: 89%

Numerical Optimization of a Microchannel Geometry for Nanofluid Flow and Heat Dissipation Assessment

et al. 2021

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“…59−61 However, these boundary conditions often cause numerical artifacts or inaccurate results. Later, the hybrid schemes such as BB-SR (BSR), 62 DM-SR (DSR), 63,64 and DM-BB (DBB) 65,66 boundary conditions were proposed, and different slip lengths could be realized by changing the combination parameter.…”

Section: Introductionmentioning

confidence: 99%

“…For the nanoscale effect of the boundary slip format, the boundary conditions of the bounce back (BB), specular reflection (SR), and diffusive Maxwell’s reflection (DM) have been widely used in the past. − However, these boundary conditions often cause numerical artifacts or inaccurate results. Later, the hybrid schemes such as BB-SR (BSR), DM-SR (DSR), , and DM-BB (DBB) , boundary conditions were proposed, and different slip lengths could be realized by changing the combination parameter.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Water Imbibing into Oil-Saturated Nanoporous Media: Coupling Molecular Interactions, the Dynamic Contact Angle, and the Entrance Effect

Wang

2021

Ind. Eng. Chem. Res.

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Spontaneous imbibition of hydraulic fracturing fluids into the water-wet inorganic media is a ubiquitous phenomenon, which has an important influence on tight/shale oil recovery and groundwater contamination. However, in nanoscale space, the fluid–solid (water–wall and oil-wall) molecular interactions, which can result in the nanoscale effects of the slip boundary and the varying interfacial fluid viscosity, will make the fluid flow behaviors be more complex and difficult to characterize. In this work, a new generalized imbibition model in inorganic nanopores and porous media is established by the theoretical analysis and a nanoscale Shan–Chen lattice Boltzmann method (LBM). The effects of pore dimensions and shapes in porous media, the nanoscale effects, the dynamic contact angle, and the entrance effect are considered and discussed. The results show that the proposed model can accurately characterize the oil/water imbibition mechanisms and be adapted to different nanoscale effects. Based on discussions, this study can provide microscopic basics of water imbibing into nanopores and provide guiding information and theoretical model for the oil recovery from tight/shale reservoirs by hydraulic fracturing, the groundwater remediation by restricting imbibition rate, and other relevant applications.

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“…Basically, fluid dynamics can involve the motion of distributions/populations of fabricated particles which can stream and colloid along a Cartesian lattice. LBM has been employed in a broad range of engineering applications such as single-phase flow [5][6][7] , multiphase flow [8][9][10][11] , phase-change heat transfer 10,12 , turbulent regime in various transport phenomena [13][14][15][16][17] , and solving nonlinear partial differential equations (NPDEs) including convection-diffusion equations [18][19][20][21][22][23][24] . The kinetic basis of LBM makes it a powerful tool in the modeling of interfacial phenomena in the multiphase flow systems [25][26][27] .…”

Section: Introductionmentioning

confidence: 99%

“…Basically, fluid dynamics can involve the motion of distributions/populations of fabricated particles which can stream and colloid along a Cartesian lattice. LBM has been employed in a broad range of engineering applications including single-phase flow, − multiphase flow, − heat transfer due to phase-change, , turbulent regime in a variety of transport phenomena, − and solving nonlinear partial differential equations (NPDEs) including convection–diffusion equations. − The kinetic basis of LBM makes it a powerful tool in the modeling of interfacial phenomena in multiphase flow systems. − Although the origin of LBM is molecular dynamic kinetic which is more fundamental compared to the continuum approaches, it is capable of recovering the traditional macroscopic scale continuity and Navier–Stokes (N–S) equations. In the absence of required meshes movement, it can be parallelized due to locality of most of the computations.…”

Section: Introductionmentioning

confidence: 99%

Central-Moments-Based Lattice Boltzmann for Associating Fluids: A New Integrated Approach

2020

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Dynamic and thermodynamic behavior of associating fluids play a crucial role in a variety of engineering and science disciplines. Cubic plus association equation of state (CPA EOS) is implemented in a central-moments-based lattice Boltzmann method (LBM) in order to mimic the thermodynamic behavior of associating fluids. The pseudopotential approach is selected to model the multiphase thermodynamic characteristics such as reduced density of associating fluids. The priority of central moments-based approach over multiple-relaxation-time collision operator is shown by performing double shear layers. The integration of central-moments-based LBM and CPA EOS is useful to simulate associating fluids at high flow rate conditions, which is extended to high-density ratio scenarios by increasing the anisotropy order of gradient operator. In order to increase the stability of the model, a higher anisotropy order of the gradient operator is implemented; about 34 present reduction in spurious velocities is noticed in some cases. The type of gradient operator considerably affects the model thermodynamic consistency. Finally, the model is validated by observing a straight line in the Laplace law test. Prediction of thermodynamic behaviours of associating fluids is of significance in biological processes as well as fluid flow in porous media.

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Boundary conditions with adjustable slip length for the lattice Boltzmann simulation of liquid flow

Cited by 34 publications

References 40 publications

Numerical Optimization of a Microchannel Geometry for Nanofluid Flow and Heat Dissipation Assessment

Numerical Optimization of a Microchannel Geometry for Nanofluid Flow and Heat Dissipation Assessment

Investigations on Water Imbibing into Oil-Saturated Nanoporous Media: Coupling Molecular Interactions, the Dynamic Contact Angle, and the Entrance Effect

Central-Moments-Based Lattice Boltzmann for Associating Fluids: A New Integrated Approach

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