Brownian dynamics simulation and experimental study of colloidal particle deposition in a microchannel flow

Unni, Harikrishnan Narayanan; Yang, Chun

doi:10.1016/j.jcis.2005.04.104

Cited by 41 publications

(43 citation statements)

References 28 publications

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“…Under such conditions, the occurrence and kinetics of plug formation is related to the relative magnitude of hydrodynamic forces (orthokinetic aggregation), repulsive and attractive potentials. In the literature, it has been numerically and experimentally shown that surface interactions like DLVO forces can play a significant role in clogging mechanisms [34]. Aggregation and clogging phenomena for inlet particle concentration / 0 ¼ 10% will be discussed for different repulsive barrier magnitudes.…”

Section: Channel Blockage Under Repulsive Conditionsmentioning

confidence: 97%

Numerical investigation of channel blockage by flowing microparticles

2014

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a b s t r a c tThe dynamic formation of 3D structures of microparticle aggregates blocking the flow through straight microchannels is investigated by direct numerical simulation of the coupled motion of particles and fluid. We use the Force Coupling Method to handle simultaneously multibody hydrodynamic interactions of confined flowing suspension together with particle-particle and particle-wall surface interactions leading to adhesion and aggregation of particles. The basic idea of the Force Coupling Method relies on a multipole expansion of forcing terms (added to the Navier-Stokes equations) accounting for the velocity perturbation induced by the presence of particles in the fluid flow. When a particle reaches the wall or an attached particle, we consider that the adhesion is irreversible and this particle remains fixed. We investigate the kinetics of the microchannel blockage for several solid volumetric concentrations and different surface interaction forces. Many physical quantities such as the temporal evolution of the bulk permeability, capture efficiency, modification of the fluid flow and forces acting on attached particles are analyzed. We show that physical-chemical interactions, modeled by DLVO forces, are essential features which control the blockage dynamics and aggregate structure. IntroductionThe physics of transport, deposition, detachment and reentrainment of colloidal particles suspended in a fluid are of major interest in many areas of fluids engineering: fouling of heat exchangers, contamination of nuclear reactors, plugging of filtration membranes and occlusion of human veins, deposits in microelectronics and in the paper industry. In many solid/liquid separation processes such as micro-filtration or ultrafiltration of water, the limitation of the process performance is related to the fouling of filtration devices. To prevent or control the occurrence of fouling, it is necessary to achieve a better understanding of the respective roles of physical-chemical phenomena and hydrodynamic interactions in a confined suspension of particles. Non-hydrodynamic surface interactions and the adhesion of particles onto solid surfaces are the essential features to be modeled. However, mainly because of a complex interplay between the hydrodynamics of the flow, the physical-chemical properties of the filtered suspensions (often in a colloidal state) and the nature of the solid material, predicting fouling dynamics is still challenging.Different experimental techniques and numerical approaches have been developed to achieve new insights on the local structure of particle aggregates and the kinetics of blockage. Sharp and Adrian [4], by means of experiments in microtubes, observed blockage due to arch formation. The experiments were performed using liquids seeded with polystyrene beads at low volumetric concentration. They showed that a stable balance between the hydrodynamic forces and contact forces (mainly solid friction) between particles and the wall provokes the formation of arches. Wyss et al.[5] stu...

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Section: Channel Blockage Under Repulsive Conditionsmentioning

confidence: 97%

Numerical investigation of channel blockage by flowing microparticles

2014

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“…In the case of spheroid and ellipsoidal particles, the determination of the rotational velocity is essential because the interaction energy is dependent on the particle orientation. However, spherical particles are symmetric and hence are less likely to be affected by the particle rotation [46]. Therefore, the particle rotational velocities are neglected in the trajectory tracking analysis.…”

Section: Brownian Motionmentioning

confidence: 99%

Multi-scale study of nanoparticle transport and deposition in tissues during an injection process

Salloum

et al. 2010

Med Biol Eng Comput

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In magnetic nanoparticle hyperthermia for cancer treatment, controlling the nanoparticle distribution delivered in tumors is vital for achieving an optimum distribution of temperature elevations that enables a maximum damage of the tumorous cells while minimizing the heating in the surrounding healthy tissues. A multi-scale model is developed in this study to investigate the spatial distribution of nanoparticles in tissues after nanofluid injection into the extracellular space of tissues. The theoretical study consists of a particle trajectory tracking model that considers particle-surface interactions and a macroscale model for the transport of nanoparticles in the carrier solution in a porous structure. Simulations are performed to examine the effects of a variety of injection parameters and particle properties on the particle distribution in tissues. The results show that particle deposition on the cellular structure is the dominant mechanism that leads to a non-uniform particle distribution. The particle penetration depth is sensitive to the injection rate and surface properties of the particles, but relatively insensitive to the injected volume and concentration of the nanofluid.

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“…Van der Waals and electrostatic forces due to the electric double layer (EDL) are highly sensitive to surface properties of both the particles and the channel wall as well as the properties of the working fluid (Unni and Yang 2005). The combinations and the relative degree of these effects not only determine the rate but also the type of aggregation.…”

Section: Introductionmentioning

confidence: 99%

Particle aggregation rate in a microchannel due to a dilute suspension flow

Stamm

Gudipaty

Rush

et al. 2011

Microfluid Nanofluid

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Particle-laden flow in a microchannel results in cluster formation and growth on the channel surface and the cluster growth, due to aggregation of polystyrene microparticles, has been investigated in this study. In particular, the initial stage of cluster growth is examined, where particlecluster interaction is the dominant growth mechanism. Both experimental measurements and theoretical considerations were utilized to explore the functional dependence of the cluster growth rate on the following parameters: suspension void fraction, flow shear strain rate, and channel-height to particle-diameter ratio. The growth rate of an average cluster is found to increase linearly with suspension void fraction which is consistent with previous reports. The growth rate coefficient is found to obey a power-law relationship with respect to the shear strain rate, and predictions based on the modernized flocculation theory agree well with the experimental results. Furthermore, the growth rate coefficient obeys a power-law relationship with respect to the channel-height to particle-diameter ratio as well, qualitatively similar to other reported studies. However, to our knowledge, the exponent value estimated in this study does not agree with any previously published values; this disagreement is likely due to differences in experimental conditions.

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Brownian dynamics simulation and experimental study of colloidal particle deposition in a microchannel flow

Cited by 41 publications

References 28 publications

Numerical investigation of channel blockage by flowing microparticles

Numerical investigation of channel blockage by flowing microparticles

Multi-scale study of nanoparticle transport and deposition in tissues during an injection process

Particle aggregation rate in a microchannel due to a dilute suspension flow

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