Migration of semiflexible polymers in microcapillary flow

Chelakkot, Raghunath; Winkler, Roland G.; Gompper, Gerhard

doi:10.1209/0295-5075/91/14001

Cited by 68 publications

(98 citation statements)

References 33 publications

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“…Similar nonequilibrium properties have been studied for colloids [7,[20][21][22][23][24][25][26], polymers [19,[27][28][29][30][31][32][33][34], vesicles [35], and cells [36,37] in flow fields, colloids in viscoelastic fluids [38], as well as for self-propelled spheres [39][40][41], rods [3,42], and other swimming objects [43][44][45]. Moreover, extensions have been proposed for fluids with nonideal equations of state [46] and mixtures [47].…”

Section: Introductionmentioning

confidence: 78%

Hydrodynamic correlations in multiparticle collision dynamics fluids

2012

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The emergent fluctuating hydrodynamics of the multiparticle collision dynamics (MPC) approach, a particlebased mesoscale simulation technique for fluid dynamics, is analyzed theoretically and numerically. We focus on the stochastic rotation dynamics implementation of the MPC method. The fluid is characterized by its longitudinal and transverse velocity correlation functions in Fourier space and velocity autocorrelation functions in real space. Particular attention is paid to the role of sound, which leads to piecewise negative correlation functions. Moreover, finite system-size effects are addressed with an emphasis on the role of sound. Analytical expressions are provided for the transverse and longitudinal velocity correlations, which are derived from the linearized Landau-Lifshitz Navier-Stokes equation adopted for an isothermal MPC fluid. The comparison of the analytical results with simulations shows excellent agreement above a minimal length scale. The simulations indicate a breakdown in hydrodynamics on length scales smaller than this minimal length. This demonstrates that we have an excellent analytical description and understanding of the MPC method and its limitations in terms of time and length scales.

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Section: Introductionmentioning

confidence: 78%

Hydrodynamic correlations in multiparticle collision dynamics fluids

2012

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“…Here, we apply a hybrid simulation approach, combining molecular dynamics simulations (MD) for the polymers with the multiparticle collision dynamics (MPC) method describing the solvent [23,24,27,[45][46][47][48][49][50]. As has been shown, the MPC method is very well suited to study the non-equilibrium properties of polymers [12,41,51,52], colloids [13,53,54], and other soft-matter object such as vesicles [55] and cells [56,57] in flow fields.…”

Section: Introductionmentioning

confidence: 99%

Semidilute Polymer Solutions at Equilibrium and under Shear Flow

et al. 2010

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The properties of semidilute polymer solutions are investigated at equilibrium and under shear flow by mesoscale simulations, which combine molecular dynamics simulations and the multiparticle collision dynamics approach. In semidilute solution, intermolecular hydrodynamic and excluded volume interactions become increasingly important due to the presence of polymer overlap. At equilibrium, the dependence of the radius of gyration, the structure factor, and the zero-shear viscosity on the polymer concentration is determined and found to be in good agreement with scaling predictions. In shear flow, the polymer alignment and deformation are calculated as a function of concentration. Shear thinning, which is related to flow alignment and finite polymer extensibility, is characterized by the shear viscosity and the normal stress coefficients

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“…Migration of fibers or vesicles in Poiseuille flow [13][14][15][16][17][18][19] is the fundamental problem of modern lab-on-chip hydrodynamics, important in various biological, medical and industrial contexts, such as Brownian dynamics of proteins, actins, DNA or biological polymers, cell motion, swimming of microorganisms, drug delivery, transport of microparticles [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Lateral migration of flexible fibers in Poiseuille flow between two parallel planar solid walls

2013

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Abstract. Dynamics of non-Brownian flexible fibers in Poiseuille flow between two parallel planar solid walls is evaluated from the Stokes equations which are solved numerically by the multipole method. Fibers migrate towards a critical distance from the wall z c, which depends significantly on the fiber length N and bending stiffness A. This effect can be used to sort fibers. Three types of accumulation are found, depending on a shear-to-bending parameter Γ . In the first type, stiff fibers deform only a little and accumulate close to the wall, where their tendency to drift away from the channel is balanced by the repulsive hydrodynamic interaction with the wall. In the second type, flexible fibers deform significantly and accumulate far from the wall. In both types, the fiber shapes at the accumulation positions are repeatable, while in the third type, they are very compact and non-repeatable. The difference between the second and third accumulation types is a special case of the difference between the regular and irregular modes for the dynamics of migrating fibers. At the regular mode, far from walls, the fiber tumbling frequency satisfies Jeffery's expression, with the local shear rate and the aspect ratio close to N .

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Migration of semiflexible polymers in microcapillary flow

Cited by 68 publications

References 33 publications

Hydrodynamic correlations in multiparticle collision dynamics fluids

Hydrodynamic correlations in multiparticle collision dynamics fluids

Semidilute Polymer Solutions at Equilibrium and under Shear Flow

Lateral migration of flexible fibers in Poiseuille flow between two parallel planar solid walls

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