Generalization of elastohydrodynamic interactions between a rigid sphere and a nearby soft wall

Karan, Pratyaksh; Chakraborty, Jeevanjyoti; Chakraborty, Suman

doi:10.1017/jfm.2021.595

Cited by 9 publications

(3 citation statements)

References 72 publications

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“…Assuming small deformations, Urzay (2010) analyzed the role of DLVO interactions on the motion of a sphere near a soft wall, predicting both reversible and irreversible adhesion behaviors. More recently, Karan et al (2020Karan et al ( , 2021 studied the effect of these interactions on time-dependent normal motion in a similar configuration. In addition to deformation due to flow, van der Waals pressure produces elastic deformations of magnitude AR 1/2 /(Gd 5/2 ) [note that d is clearance between the surfaces (see Section 2)], which defines another dimensionless compliance AR 1/2 /(Gd 7/2 ).…”

Section: The Role Of Intermolecular Forcesmentioning

confidence: 99%

Fluid-Elastic Interactions Near Contact at Low Reynolds Number

Rallabandi

2024

Annu. Rev. Fluid Mech.

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Interactions between fluid flow and elastic structures are important in many naturally occurring and engineered systems. This review collects and organizes recent theoretical and experimental developments in understanding fluid-structure interactions at low Reynolds numbers. Particular attention is given to the motion of objects moving in close proximity to deformable soft materials and the ensuing interplay between fluid flow and elastic deformation. We discuss how this interplay can be understood in terms of forces and torques, and harnessed in applications such as microrheometry, tribology, and soft robotics. We then discuss the interaction of soft and wet objects close to contact, where intermolecular forces and surface roughness effects become important and are sources of complexity and opportunity. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 56 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: The Role Of Intermolecular Forcesmentioning

confidence: 99%

Fluid-Elastic Interactions Near Contact at Low Reynolds Number

Rallabandi

2024

Annu. Rev. Fluid Mech.

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“…Overall, it appears that prior studies have not considered the combined effect of non-Newtonian rheology, deformation of the compliant flow conduit, and electrokinetics all together, leaving this problem open. Furthermore, beyond electrokinetics, non-hydrodynamic effects, such as van der Waals and solvation forces [235,236] as well as finite-size effects and steric interactions [237], arise at nanometer level confinements. These effects can also be incorporated into the physical theories and mechanistic models reviewed herein, assuming the continuum hypothesis still holds.…”

Section: Electrohydrodynamicsmentioning

confidence: 99%

Soft hydraulics: from Newtonian to complex fluid flows through compliant conduits

Christov¹

2021

J. Phys.: Condens. Matter

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Microfluidic devices manufactured from soft polymeric materials have emerged as a paradigm for cheap, disposable and easy-to-prototype fluidic platforms for integrating chemical and biological assays and analyses. The interplay between the flow forces and the inherently compliant conduits of such microfluidic devices requires careful consideration. While mechanical compliance was initially a side-effect of the manufacturing process and materials used, compliance has now become a paradigm, enabling new approaches to microrheological measurements, new modalities of micromixing, and improved sieving of micro- and nano-particles, to name a few applications. This topical review provides an introduction to the physics of these systems. Specifically, the goal of this review is to summarize the recent progress towards a mechanistic understanding of the interaction between non-Newtonian (complex) fluid flows and their deformable confining boundaries. In this context, key experimental results and relevant applications are also explored, hand-in-hand with the fundamental principles for their physics-based modeling. The key topics covered include shear-dependent viscosity of non-Newtonian fluids, hydrodynamic pressure gradients during flow, the elastic response (deformation and bulging) of soft conduits due to flow within, the effect of cross-sectional conduit geometry on the resulting fluid–structure interaction, and key dimensionless groups describing the coupled physics. Open problems and future directions in this nascent field of soft hydraulics, at the intersection of non-Newtonian fluid mechanics, soft matter physics, and microfluidics, are noted.

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“…2012; Villey et al. 2013; Wang, Dhong & Frechette 2015; Karan, Chakraborty & Chakraborty 2018, 2020, 2021) and transverse (Sekimoto & Leibler 1993; Beaucourt, Biben & Misbah 2004; Skotheim & Mahadevan 2005; Weekley, Waters & Jensen 2006; Urzay, Llewellyn Smith & Glover 2007; Snoeijer, Eggers & Venner 2013; Bouchet et al. 2015; Salez & Mahadevan 2015; Saintyves et al.…”

Section: Introductionmentioning

confidence: 99%

Capillary-lubrication force exerted on a two-dimensional particle moving towards a thin fluid film

Jha,

Amarouchene,

Salez

2023

J. Fluid Mech.

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A rigid object moving in a viscous fluid and in close proximity to an elastic wall experiences self-generated elastohydrodynamic interactions. This has been the subject of intense research activity, with recent and growing attention given to the particular case of elastomeric and gel-like substrates. Here, we address the situation where the elastic wall is replaced by a capillary surface. Specifically, we analyse the lubrication flow generated by the prescribed normal motion of a rigid infinite cylinder near the deformable interface separating two immiscible and incompressible viscous fluids. Using a combination of analytical and numerical treatments, we compute the emergent capillary-lubrication force at leading order in capillary compliance, and characterize its dependencies with the interfacial tension, viscosities of the fluids, and length scales of the problem. Interestingly, we identify two main contributions: (i) a velocity-dependent adhesive-like force; (ii) an acceleration-dependant inertia-like force. Our results may have implications for the mobility of colloids near complex interfaces and for the motility of confined microbiological entities.

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Generalization of elastohydrodynamic interactions between a rigid sphere and a nearby soft wall

Abstract: Abstract

Cited by 9 publications

References 72 publications

Fluid-Elastic Interactions Near Contact at Low Reynolds Number

Fluid-Elastic Interactions Near Contact at Low Reynolds Number

Soft hydraulics: from Newtonian to complex fluid flows through compliant conduits

Capillary-lubrication force exerted on a two-dimensional particle moving towards a thin fluid film

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