Two-Way Coupling FSI Approach to Inertial Focusing Dynamics Under Dean Flow Patterns in Asymmetric Serpentines

Pedrol, Eric; Díaz, Francisco Antonio González; Aguiló, Magdalena

doi:10.20944/preprints201808.0114.v1

Cited by 2 publications

(2 citation statements)

References 40 publications

(52 reference statements)

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“…FSI technique [25] is often applied where a deformation in the solid structure is expected due to its interaction with the fluid flow [26,27] (for more details, see [28]). FSI incorporates an ALE method to take into account the mesh deformation caused by the movement and the impact of droplet and particle [29], and thereby, droplet and particle become freely moving meshes. This integrated method is able to present an accurate prediction of the drop-particle collision dynamics as it considers full underlying physics of the problem, and both droplet and particle are modelled as unrestrained elements during the simulations.…”

Section: Methodsmentioning

confidence: 99%

Building pathways to full encapsulation processes

Shamsipour

Manshadi

Khojasteh

et al. 2021

ICLASS

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Encapsulation, i.e. the coating of tiny solid or liquid particles in a liquid film, has received a growing interest among scholars due to its practical applications, especially in food and pharmaceutical industries. Encapsulation technology is used in coating and controlling drug delivery by protecting the active agents from environmental pressures (e.g., heat, oxygen) and unsought colours/odours. In practice, when dealing with solid particles, this process occurs through impacting liquid droplets of the coating material upon the agent particles. While, in reality, droplet and particle can freely move before and after the collision, a vast majority of the previous efforts to characterize drop-particle impact outcomes have considered that one of the two components is stationary. This study numerically investigates the head-on collisions between freely moving droplet of a glycerine-water solution or synthetic fluids, and freely moving dry spherical particles. In order to achieve this results, a novel 2D axisymmetric Level Set simulation includes fluid-structure interaction (FSI) and an arbitrary Lagrangian-Eulerian (ALE) technique The relative impact velocity and drop-to-particle density ratio are varied across the simulation cases to indicate the importance of variations in momentum. These preliminary results indicate that optimising the momentum is a key factor in achieving a full and stable encapsulation, requiring further research.

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Section: Methodsmentioning

confidence: 99%

Building pathways to full encapsulation processes

Shamsipour

Manshadi

Khojasteh

et al. 2021

ICLASS

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“…However, modeling the flow in these devices for a specific application is quite challenging as the full Navier-Stokes equations are needed to solve for the particle dynamics in these complex channels. Often complete models are too computationally burdensome to be of any practical use in designing these devices [16]. Given the complexity of simulating particle migration, some authors have proposed the use of lattice Boltzmann methods (LBM) as the technique very computationally efficient [17,18].…”

Section: Introductionmentioning

confidence: 99%

A model for inertial particles in curvilinear flows

Garcia

Pennathur

2019

Microfluid Nanofluid

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The recent advent of advanced microfabrication capabilities of microfluidic devices has driven attention towards the behavior of particles in inertial flows within microchannels for applications related to the separation and concentration of bio-particles. The phenomena of inertial focusing has been demonstrated to be a robust technique in such applications, where the flow of particles in a curvilinear geometry has proven to be particularly advantageous, not only because the geometry can reduce the foot-print of a lab-on-chip device, but also because the coupling of secondary Dean flows to inertial forces allows for exquisite particle manipulations. However, the ability to design a curvilinear channel for a specific application is often based on empirical results, as theoretical models to date typically do not include the effects of a finite sized particle within the flow. Here we present a complete numerical model that directly simulates a particle within a confide curvilinear flow and using this model we investigate the three dimensional focusing behavior of inertial particles as well as the applicability of the point particle assumptions previous researchers have proposed. Finally, we propose a new model that takes into account the full physics, but relies on a perturbation expansion of the lateral forces, where the perturbation parameter is the curvature ratio of the channel. This simple model can be used to predict the behavior of particles in complex channel geometries where the curvature may not be constant.

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Two-Way Coupling FSI Approach to Inertial Focusing Dynamics Under Dean Flow Patterns in Asymmetric Serpentines

Cited by 2 publications

References 40 publications

Building pathways to full encapsulation processes

Building pathways to full encapsulation processes

A model for inertial particles in curvilinear flows

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