Search results for "Suspension flow"

showing 3 items of 3 documents

Parallelization of a Lattice Boltzmann Suspension Flow Solver

2002

We have applied a parallel Lattice Boltzmann method to solve the behaviour of the suspension flow. The complex behaviour of the suspension flow cannot be solved by analytical methods, so simulations are the only way to study it. Usually the size of an interesting problem is so big that calculation time on one processor is too long, and this can be solved by parallel program. We have written a parallel suspension flow solver and tested it on massive parallel computers. The measured performance of our program show that the parallelization of suspension particles was successful. We also show that over one million particles can be simulated.

Condensed Matter::Soft Condensed MatterComputer scienceLattice (order)Suspension flowParallel algorithmLattice Boltzmann methodsCollision detectionParallel computingSolverComputational science
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Characterization of micro-fibrillated cellulose fiber suspension flow using multi scale velocity profile measurements

2017

Rheological properties and boundary layer flow behavior of Micro Fibrillated Cellulose (MFC) suspended in water was studied using a novel velocity profiling rheometric technique. The method is based on measuring stationary velocity profiles of fluid flow in a straight tube simultaneously by Doppler Optical Coherence Tomography (DOCT) and by Ultrasound Velocity Profiling (UVP). The high resolution DOCT provides velocity profiles near the transparent tube wall, while UVP yields corresponding information in the interior parts of the flow. The data from the two instruments is combined into a comprehensive velocity profile including both the thin boundary layer near the wall and the interior par…

Materials scienceScale (ratio)selluloosamicrofibrillated cellulose suspension02 engineering and technologyboundary layerwall-slip010402 general chemistry01 natural sciencesRheologyreologiaultrasound velocity profilingwall slipGeneral Materials ScienceComposite materialoptical coherence tomographykuidutForestryoptinen koherenssitomografia021001 nanoscience & nanotechnology0104 chemical sciencesCharacterization (materials science)Cellulose fiberBoundary layerOCTWall slipSuspension flowrheology0210 nano-technologyNordic Pulp and Paper Research Journal
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The Mean-Field Limit for Solid Particles in a Navier-Stokes Flow

2008

We propose a mathematical derivation of Brinkman's force for a cloud of particles immersed in an incompressible viscous fluid. Specifically, we consider the Stokes or steady Navier-Stokes equations in a bounded domain Omega subset of R-3 for the velocity field u of an incompressible fluid with kinematic viscosity v and density 1. Brinkman's force consists of a source term 6 pi rvj where j is the current density of the particles, and of a friction term 6 pi vpu where rho is the number density of particles. These additional terms in the motion equation for the fluid are obtained from the Stokes or steady Navier-Stokes equations set in Omega minus the disjoint union of N balls of radius epsilo…

Stokes equation01 natural sciencesHomogenization (chemistry)Navier-Stokes equationPhysics::Fluid DynamicsMathematics - Analysis of PDEsFOS: Mathematics[MATH.MATH-AP]Mathematics [math]/Analysis of PDEs [math.AP]Boundary value problem0101 mathematicsMathematical Physics(MSC) 35Q30 35B27 76M50Particle systemPhysicsHomogenization010102 general mathematicsMathematical analysis35Q30 35B27 76M50Stokes equationsStatistical and Nonlinear Physics010101 applied mathematicsFlow velocityDragSuspension FlowsBounded functionCompressibilityBall (bearing)Navier-Stokes equationsAnalysis of PDEs (math.AP)
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