A5090443863- Rheology and Fluid Dynamics Studies
- Fluid Dynamics and Turbulent Flows
- Granular flow and fluidized beds
- Lattice Boltzmann Simulation Studies
- Material Dynamics and Properties
- Fluid Dynamics and Thin Films
- Particle Dynamics in Fluid Flows
- Blood properties and coagulation
- Fluid Dynamics and Vibration Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Fluid Dynamics and Heat Transfer
- Geological formations and processes
- Hydrology and Sediment Transport Processes
- Reservoir Engineering and Simulation Methods
- Groundwater flow and contamination studies
- Fluid Dynamics Simulations and Interactions
- Micro and Nano Robotics
- Fluid Dynamics and Mixing
- Coastal and Marine Dynamics
- Drilling and Well Engineering
- Pickering emulsions and particle stabilization
- Polysaccharides Composition and Applications
- Enhanced Oil Recovery Techniques
- Tribology and Lubrication Engineering
- Microfluidic and Bio-sensing Technologies
Cornell University
2020-2024
Princeton University
2022
Ohio University
2014-2020
Centre National de la Recherche Scientifique
2018-2020
Université de Bordeaux
2018-2020
Solvay (France)
2018-2020
Institut Universitaire des Systèmes Thermiques Industriels
2019
Laboratoire Navier
2015-2018
École nationale des ponts et chaussées
2015-2017
University of British Columbia
2007-2014
Viscoelastic fluids can exhibit striking flow instabilities under conditions where ordinary Newtonian are stable, owing to the nonlinear coupling of elastic and viscous stresses. This article provides perspectives on viscoelastic by integrating input from speakers at a recent international workshop: historical remarks, characterization flows, discussion experimental simulation tools, modern questions puzzles that motivate further studies this fascinating subject. The materials here will be...
Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Guillaume Ovarlez, Fabien Mahaut, Stéphanie Deboeuf, Nicolas Lenoir, Sarah Hormozi, Xavier Chateau; Flows of suspensions particles in yield stress fluids. Journal Rheology 1 November 2015; 59 (6): 1449–1486. https://doi.org/10.1122/1.4934363 Download citation file: Ris (Zotero) Reference Manager EasyBib...
Pressure-imposed rheometry is used to study the rheological properties of suspensions non-colloidal spheres in yield-stress fluids. Accurate measurements for both shear stress and particle normal are obtained dense regime. The favourably compared with a model based on scaling arguments homogenisation methods.
Summary In this paper, a three‐dimensional numerical solver is developed for suspensions of rigid and soft particles droplets in viscoelastic elastoviscoplastic (EVP) fluids. The presented algorithm designed to allow the first time simulations inertial turbulent EVP fluids with large number droplets. This achieved by combining fast highly scalable methods such as an FFT‐based pressure solver, evolution equation non‐Newtonian (including EVP) stresses. flexible computational framework, fluid...
Abstract A key challenge underlying the design of miniature machines is encoding materials with time‐ and space‐specific functional behaviors that require little human intervention. Dissipative processes drive beyond equilibrium evolve continuously time location represent one promising strategy to achieve such complex functions. This work reports how internal nonequilibrium states liquid crystal (LC) emulsion droplets undergoing chemotaxis can be used delivery a chemical agent targeted...
We present numerical simulations of laminar and turbulent channel flow an elastoviscoplastic fluid. The non-Newtonian is simulated by solving the full incompressible Navier–Stokes equations coupled with evolution equation for stress tensor. are carried out a wide range Reynolds numbers, Bingham numbers ratios fluid total viscosity, while performed at fixed bulk number equal to 2800 weak elasticity. show that in regime friction factor increases monotonically (yield stress) decreases viscosity...
Adding large non-Brownian particles to a cornstarch suspension moves the discontinuous shear-thickening transition lower critical shear rates, allowing control of properties by varying large-particle concentration, while stress at is little changed.
In the limit of a large yield stress, or equivalently at initiation motion, viscoplastic flows can develop narrow boundary layers that provide either surfaces failure between rigid plugs, lubrication plugged flow and wall buffers for regions predominantly plastic deformation. Oldroyd ( Proc. Camb. Phil. Soc. , vol. 43, 1947, pp. 383–395) presented first theoretical discussion these layers, offering an asymptotic reduction governing equations some model problems. However, complicated...
In this Letter, we present a new mechanism under the action of which shear thickening suspension transitions from continuous to discontinuous regime. This transition occurs by adding high concentrations large spheres suspension. We show that solid volume fraction interstitial matrix is locally enhanced due presence particles and excluded-volume shells surrounding particles, thus leading at local scale.
We experimentally investigate particle migration in a non-Brownian suspension sheared Taylor–Couette configuration and the limit of vanishing Reynolds number. Highly resolved index-matching techniques are used to measure local particulate volume fraction. In this wide-gap configuration, we find that for large range bulk fraction, $\unicode[STIX]{x1D719}_{b}\in [20\,\%{-}50\,\%]$ , fully developed concentration profiles well predicted by balance model Nott & Brady ( J. Fluid Mech. vol....
Interfacial instabilities of multi-layer shear flows may be eliminated by astute positioning yield stress fluid layers that remain unyielded at the interface(s). We study initiation, development lengths and temporal stability such in setting a Newtonian core surrounded Bingham lubricated fluid, within pipe. Flow initiation is effected starting flow with pipe full stationary injecting both inner outer fluids simultaneously. Initial instability dispersive mixing front remains localised...
In this paper, we introduce a new technique based on X-ray radiography with high temporal (O(0.1 s)) and spatial (O(10 μm)) resolutions to study fast suspension flows regardless of optical access. We benefit from the axial symmetry our flow configuration, wide gap Couette setup, extract 3D solid volume fraction field single projection image. propose mathematical algorithm inversion Abel transform in conjunction H1 regularization data denoising measure suspensions second. show that results...
Solids dispersion is an important part of hydraulic fracturing, both in helping to understand phenomena such as tip screen-out and spreading the pad, new process variations cyclic pumping proppant. Whereas many frac fluids have low viscosity, e.g. slickwater, others transport proppant through increased viscosity. In this context, one method for influencing solids-carrying capacity use a yield stress fluid fluid. We propose model framework scenario analyse simplifications. A key effect...
We present a numerical study of non-colloidal spherical and rigid particles suspended in Newtonian, shear thinning thickening fluids employing an immersed boundary method. consider linear Couette configuration to explore wide range solid volume fractions ( $0.1\leqslant \unicode[STIX]{x1D6F7}\leqslant 0.4$ ) particle Reynolds numbers Re_{p}\leqslant 10$ ). report the distribution fluid phase velocity fraction show that close boundaries inertial effects result significant slip between phase....
We present an experimental study on the viscous to inertial mode of shear thickening in dense non-Brownian suspensions. design a model suspension consisting monosized spherical particles within Newtonian suspending fluid. develop protocol for rheological characterization suspensions using conventional rheometry technique. Our results provide constitutive laws with solid volume fractions close jamming when both and effects at particle scale are present. perform atomic force microscopy measure...
We perform $3$D numerical simulations to investigate the sedimentation of a single sphere in absence and presence simple cross shear flow yield stress fluid with weak inertia. In our simulations, settling is considered be primary flow, whereas linear secondary amplitude $10\%$ flow. To study effects elasticity plasticity carrying on drag as well dynamics, modeled using elastovisco-plastic (EVP) constitutive laws proposed by \cite{saramito2009new}. The extra non-Newtonian tensor fully coupled...
Visco-plastic lubrication (VPL) has been established as a method for reliably suppressing interfacial instabilities and enhancing flow stability multi-layer systems. Here we extend this methodology to the formation of shaped interfaces in multifluid core-annular configurations. We study VPL flows which perform both experiment computation with oscillating rates individual phases. According rate variations succeed freezing range different patterns. Experiments performed carbopol lubricating...
Viscoplastic fluids do not flow unless they are sufficiently stressed. This property can be exploited in order to produce novel features. One example of such flows is viscoplastically lubricated (VPL) flow, which a viscoplastic fluid used stabilize the interface multi-layer far beyond what might expected for typical viscous–viscous interface. Here we extend this idea by considering encapsulation droplets within fluid, purpose transportation, e.g. pipelines. The main advantage method,...