Numerical simulation of microchannel blockage by the random walk method

Klimenko, Lyudmila S.; Maryshev, Boris S.

doi:10.1016/j.cej.2019.122644

Cited by 18 publications

(13 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To calculate the flow in a channel with a complex wall shape formed by particles, the model developed in [10] for laminar flow of a viscous fluid at small Reynolds numbers is used. In dimensionless units the problem describing a stationary flow in terms of vorticity ( ) and pressure ( p ) can be written in the following form…”

Section: Figure 1: Sketch Of the Problemmentioning

confidence: 99%

“…The authors explain clogging by mutual aggregation of particles, but sorption of particles on the wall and effective narrowing of real channels are not taken into account. However, in some cases, it is the narrowing of channels due to sorption on the wall that turns out to be the determining factor leading to channel clogging, which was shown in [10].…”

mentioning

confidence: 99%

“…Numerically [12] using an adhesion/collision model (JKR) that accounts for aggregate formation as well as particle deposition on the channel walls, this was confirmed. However, the influence of the channel shape on the flow was not considered, such influence was taken into account in [10].…”

mentioning

confidence: 99%

“…The paper [10] is devoted to the study of clogging of an initially clean channel by a fine impurity, taking into account the mutual influence of the shape of the walls (which changes when particles are deposited on them) on the fluid flow formed in the channel gap under the action of an external pressure drop. In this work, the disruption of particles from the walls is provided by the action of thermal fluctuations (affecting the strength of the bond between the particle and the wall) and viscous forces arising from the flow.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Microchannel cleaning by the external laminar flow

Klimenko)¹,

Maryshev²

2020

Bulletin of Perm University. Physics

View full text Add to dashboard Cite

The paper is devoted to study of the cleaning a microchannel contaminated by solute particles deposited on channel walls. The main and the most common cause of microchannel clogging is sorption of solute particles on channel walls or “physical sorption”. In this paper, we study the problem of the drift of solid non-interacting particles into a microchannel, which can stick to its walls due to Van der Waals interactions and break away from the wall due to viscous stress. A constant pressure drop is fixed between the inlet and the outlet of the channel. At the initial time moment, the channel walls are contaminated with adhering particles, i.e. the form of walls affects the formation of the flow structure through the channel. Over time, under the action of viscous stress the particles detach from the channel walls, thus cleaning occurs. The interaction of the detached particles with the flow is taken into account within the Stokes approximation. In addition, the model takes into account random walks caused by diffusion. The problem is solved numerically in the framework of the random walk model. The evolution of the fluid flow in the channel during its cleaning is obtained. The dependences of the concentration of settled particles on the flow rate and the strength of the Van der Waals interaction between particle and wall are determined. The dependence of the flow rate through the channel cross section on the concentration of settled particles was investigated. The channel cleaning time was estimated.

show abstract

Section: Figure 1: Sketch Of the Problemmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Microchannel cleaning by the external laminar flow

Klimenko)¹,

Maryshev²

2020

Bulletin of Perm University. Physics

View full text Add to dashboard Cite

show abstract

“…It has been known as a serious and unignorable problem leading to the reduced system efficiency and potential safety hazards in many industrial systems, including transport of suspension of particles, 1 printing, 2 heat exchange, 3,4 and microfluidic devices 5,6,7 . Even for filtration 8,9 or sieving 10 systems, in which particles are expected to be retained, the system lifetime strongly depends on the ability to keep the flow steady and uninterrupted 11,12 …”

Section: Introductionmentioning

confidence: 99%

Mechanism for clogging of microchannels by small particles with liquid cohesion

Shao

Ruan

2021

AIChE Journal

View full text Add to dashboard Cite

We numerically investigate the effect of liquid cohesion on the clogging of microchannels induced by small wet particles. The computer simulation is performed by the discrete element method (DEM) with cohesive contact models in presence of pendular liquid bridges, which is embedded into the computational fluid dynamics (CFD). We find that liquid cohesion significantly promotes particle deposition and agglomerate growth. A clogging phase diagram, in the form of Weber number and Stokes number, is constructed to quantify the clogging‐nonclogging transition. The competition between particle–particle and particle–fluid interactions is quantitatively discussed in terms of particle velocity and slip velocity. Strong cohesion can address a greater slip velocity or drag between particles and fluid, which depresses the resuspension of deposited particles and results in clogging. Finally, we compare our results with clogging induced by van der Waals adhesion of small dry particles and find that the competence of liquid cohesion is more prominent.

show abstract

Convective Stability of a Net Mass Flow Through a Horizontal Porous Layer with Immobilization and Clogging

Maryshev

Klimenko

2021

Transp Porous Med

View full text Add to dashboard Cite

Numerical simulation of microchannel blockage by the random walk method

Cited by 18 publications

References 29 publications

Microchannel cleaning by the external laminar flow

Microchannel cleaning by the external laminar flow

Mechanism for clogging of microchannels by small particles with liquid cohesion

Convective Stability of a Net Mass Flow Through a Horizontal Porous Layer with Immobilization and Clogging

Contact Info

Product

Resources

About