Temperature inhomogeneities simulated with multiparticle-collision dynamics

Lüsebrink, Daniel; Ripoll, Marisol

doi:10.1063/1.3687168

Cited by 26 publications

(44 citation statements)

References 85 publications

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“…In each collision, mass, momentum, and energy are locally conserved. This allows the algorithm to properly capture hydrodynamic interactions, thermal fluctuations, to account for heat transport and to maintain temperature inhomogeneities [29,30]. Simulation units are chosen to be m = 1, a = 1 and k B T = 1, where k B is the Boltzmann constant and T the average system temperature.…”

Section: Simulation Of a Janus Microswimmer In Solutionmentioning

confidence: 99%

Hydrodynamic simulations of self-phoretic microswimmers

2014

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A mesoscopic hydrodynamic model to simulate synthetic self-propelled Janus particles which is thermophoretically or diffusiophoretically driven is here developed. We first propose a model for a passive colloidal sphere which reproduces the correct rotational dynamics together with strong phoretic effect. This colloid solution model employs a multiparticle collision dynamics description of the solvent, and combines potential interactions with the solvent, with stick boundary conditions. Asymmetric and specific colloidal surface is introduced to produce the properties of self-phoretic Janus particles. A comparative study of Janus and microdimer phoretic swimmers is performed in terms of their swimming velocities and induced flow behavior. Self-phoretic microdimers display long range hydrodynamic interactions and can be characterized as pullers or pushers. In contrast, Janus particles are characterized by short range hydrodynamic interactions and behave as neutral swimmers. Our model nicely mimics those recent experimental realization of the self-phoretic Janus particles.

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Section: Simulation Of a Janus Microswimmer In Solutionmentioning

confidence: 99%

Hydrodynamic simulations of self-phoretic microswimmers

2014

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“…MPC correctly captures the hydrodynamic equations [44,45]. It has been successfully applied to model steady shear flow situations in colloids [46], polymers [47], vesicles in shear flow [48], colloidal rods [49] and more recently to study the steady state of a gas of particles in a temperature gradient [50].…”

Section: Momentum-conserving Gas Of Interacting Particlesmentioning

confidence: 99%

Thermoelectric efficiency in momentum-conserving systems

Benenti¹,

Casati²,

Mejía‐Monasterio³

2014

New J. Phys.

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We show that for a two-dimensional gas of elastically interacting particles the thermoelectric efficiency reaches the Carnot efficiency in the thermodynamic limit. Numerical simulations, by means of the multi-particle collision dynamics method, show that this result is robust under perturbations. That is, the thermoelectric figure of merit remains large when momentum conservation is broken by weak noise.

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“…43,44 This technique has shown to include properly hydrodynamic interactions, 45,46 and furthermore to be able to sustain temperature gradients. 47 Colloidal dynamics are simulated by MD, where the interactions between colloids is considered by explicit potentials. Apart from the explicit and efficient implementation of the non-isothermal solvent, the employed MPC method offers us the possibility of strongly tune the solvent colloid interactions.…”

Section: Simulation Modelmentioning

confidence: 99%

Collective thermodiffusion of colloidal suspensions

Lüsebrink

Ripoll

2012

The Journal of Chemical Physics

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The thermophoretic behavior of concentrated colloidal suspensions can be understood as the sum of single particle and collective effects. Here, we present a simulation model to investigate the particularities of the collective thermodiffusive effects in concentrated uncharged solutions, where the influence of different colloid-colloid interactions is analyzed. The concentration dependence found in our simulations qualitatively agrees with experimental results. Colloids with repulsive interactions are found to accumulate more effectively than the solvent in the warm areas, such that the corresponding Soret coefficients are negative and decrease with increasing concentration. The accumulation of colloids in the cold regions is facilitated by attraction, such that colloids with attractive interactions have larger values of the Soret coefficient. A thermodynamic argument that explains our results from equilibrium quantities is discussed as well.

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Temperature inhomogeneities simulated with multiparticle-collision dynamics

Cited by 26 publications

References 85 publications

Hydrodynamic simulations of self-phoretic microswimmers

Hydrodynamic simulations of self-phoretic microswimmers

Thermoelectric efficiency in momentum-conserving systems

Collective thermodiffusion of colloidal suspensions

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