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 Alan A. Catherall, John R. Melrose, Robin C. Ball; Shear thickening order–disorder effects in concentrated colloids at high shear rates. J. Rheol. 1 January 2000; 44 (1): 1–25. https://doi.org/10.1122/1.551072 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote...

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 John R. Melrose, Robin C. Ball; Continuous shear thickening transitions in model concentrated colloids—The role of interparticle forces. Journal Rheology 1 September 2004; 48 (5): 937–960. https://doi.org/10.1122/1.1784783 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers...

We consider the problem of hard spheres shearing from rest with hydrodynamic lubrication, but no Brownian forces. A theoretical model is presented, in terms aggregation elongated clusters particles, and predicts a jamming transition, where stress average cluster size tend to infinity after finite amount strain. The compared simulation data [Europhys. Lett. 32, 535 (1995)], critical volume fraction above which will occur macroscopic systems.

In the thin-cell electrochemical deposition of metals interfacial velocity is shown, in regime dominated by migration transport, to match drift counterion. The predicted be independent concentration leading order and deposit density related that electrolyte transport number Hecker-like pattern transitions occur when an acid front migrating from anode meets deposit. radius at transition depend only on ratio ion mobilities.

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 John R. Melrose, Robin C. Ball; "Contact networks" in continuously shear thickening colloids. J. Rheol. 1 September 2004; 48 (5): 961–978. https://doi.org/10.1122/1.1784784 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Dropdown...

In an espresso-style extraction hot water (90 ± 5 °C) is driven through a coffee packed bed by pressure gradient to extract soluble material from the matrix. Permeability key parameter affecting as it determines flow rate and hence brewing residence time. This may alter bed-to-cup mass transfer therefore impact brew quality. this work methodology that will allow estimation of permeability beds in steady-state was developed. Fitting measured – drop data Darcy's law resulted values range...

We present numerical evidence that the ideal model of sheared concentrated hard spheres with just hydrodynamic interactions does not reach a steady state. The distribution gaps between particles collapses to ever smaller values as strain is increased from rest until problem becomes numerically intractable. case Reynolds lubrication interaction marginal in more general family models which viscous diverge power law inverse interparticle gap. non-equilibrium hard-sphere represents limiting...

We report on the results of extensive Brownian dynamics simulations colloid phase separation due to depletion flocculation. study in detail effect potential variation at fixed volume fraction and range interaction. find a variety nonequilibrium behaviors for quenches into fluid+crystal coexistence regime. present clear evidence metastability, homogeneous nucleation, kinetically arrested gel state. also that suggests density instability metastable fluid preceding crystal nucleation. Our...

We elucidate the basic physics of shear thickening in colloids from viewpoint dissipative interactions between close approaching particles. With just hard-sphere lubrication, Brownian spheres show a logarithmic at high stresses. use model due to porous surfaces that is enhanced by stronger surface forces, and compare successfully simulation with experiment. The onset sensitive degree order history shear.

Brownian dynamics (BD) simulations have been carried out of the rheology two model weakly aggregated suspensions—model electrorheological (ER) fluids with anisotropic dipole interactions and depletion flocculated (DF) systems isotropic well potential interactions. At rest, both form an infinite gel-like aggregate network. Under shear, they shear thin undergo shear-induced agglomeration to structures more compact than gels at rest. The present work reports much larger (N=500) considered...

Copper electrodeposits from an acid solution were grown, supported by laboratory filter paper. The paper provides good sample preservation and prevents convective solvent motion. Structural data electron microscope image analysis are reported. On decreasing the applied voltage, a transition dense radial growth to open was observed. Values of fractal dimension measured for series growths found in range 2.0--1.7. often inhomogeneous anisotropic, both on microscopic macroscopic scales. A number...

We present a compact model describing the laminar flow of viscous multiphase fluids in micro-channel networks. apply this to 2 immiscible representing typically oil and water, network micro-channels comprising one inlet for each fluid splitting into branches meeting at T-junction, where phases are combined before exiting through two outlets. This is akin an electrical "Wheatstone bridge" represents simplified interdigital micro-reactor, be mixed separated smaller later re-combined together....

The recently recognised class of hierarchical lattices is examined through a number examples. Definitions length, intrinsic dimension and connectivity are made used to discuss variations exponents calculated on the Ising model. Generalisations regular lattice results found for at discontinuity fixed points in 1+ epsilon dimensions.

Computer simulations of the breakup thermally stable, fully flocculated colloidal gels were performed in monolayers under shear flow. The study was transient response and aggregate applied strain, their relation to angular rigidity bond. evolution stress showed a power law behavior which is interpreted by scaling arguments. A theory presented for arbitrary dimensions. In our failure individual bonds monitored, with dominant mode found be bending aggravated tension.

An idealized model of a sheared suspension particles with dipole interactions is simulated at volume fraction 30%. The motivated by the need to understand electro-rheological suspensions. In phase separation regime in equilibrium, form gel. nonequilibrium diagram for has liquid and shear string phases flowing layers which corresponds equilibrium separation. Transitions between are driven competition Brownian, forces. layered bounded Brownian Stokesian boundaries: crossover these particle...

The rheology of concentrated, aggregated colloidal suspensions is determined through particulate simulations. Aggregating systems experience a large viscous enhancement over nonaggregating systems, this being due to the increase in component viscosity arising from repulsive colloid (thermodynamic) forces when attractive are present. shear behavior aggregating for volume fraction 0.47⩽φc⩽0.57, characterized steady state regime wide range rate, and found be power law, thinning η∼f(φc)γ̇−α,...

Using Brownian dynamics simulations, we investigate continuum percolation in a system of colloid particles aggregating due to depletion flocculation. For all values potential, there is lower threshold volume fraction at which percolating cluster appears. This defines “phase” boundary that crosses the phase between fluid and fluid+crystal coexistence. In two-phase coexistence regime, lifetime percolated clusters increases dramatically, therefore may be related transient gel reported from...

The aging of colloidal gels is investigated using very long duration Brownian dynamics simulations. Asakura-Oosawa description the depletion interaction used to model a simple colloid polymer mixture. Several regimes are identified during gel formation. intermediate scattering function displays double decay characteristic systems where some kinetic processes frozen. beta relaxation at short times explained in terms Krall-Weitz for decorrelation due elastic modes present. alpha well described...