Abstract We study the dynamics and interactions of elliptic active particles in a two dimensional solvent. The are self-propelled through prescribing fluid stress at one half fluid-particle boundary. is treated explicitly solving Stokes equation discontinuous Galerkin scheme, which allows to simulate strictly incompressible fluids. present numerical results for single particle give an outlook o...

The aim of this study was to the structure, morphology, magnetic, and magnetorheological properties cobalt cobalt-zinc ferrite powders be used as a functional component fluids. Ferrites CoFe2O4 Co0.65Zn0.35Fe2O4 were obtained by combined hydrolysis inorganic metal salt in aqueous solutions followed thermal treatment precipitates. ferrites studied means X-ray phase analysis, scanning electron mi...

We present a progress report on our work on lattice Boltzmann methods for colloidal suspensions. We focus on the treatment of colloidal particles in binary solvents and on the inclusion of thermal noise. For a benchmark problem of colloids sedimenting and becoming trapped by capillary forces at a horizontal interface between two fluids, we discuss the criteria for parameter selection, and addre...

Levine, Elliot M. (National Institutes of Health, Bethesda, Md.). Protein turnover in Escherichia coli as measured with an equilibration apparatus. J. Bacteriol. 90:1578-1588. 1965.-Intercellular protein turnover (the reutilization by one cell of amino acids derived from the protein of another cell) occurs at a rate of 0.16 to 0.18% per hour in nongrowing cultures of Escherichia coli, as determ...

Prior studies have revealed that nonzero odd viscosity is an essential property for chiral active fluids. Here we report such also exists in suspensions of non-active or non-externally-driven but chirally-shaped particles. Computational simulations are carried out monolayers dense ratchets simple shear and planar extensional flows. The contact between two can be either frictionless infinitely-f...

Jamming is a phenomenon occurring in systems as diverse as traffic, colloidal suspensions, and granular materials. A theory on the reversible elastic deformation of jammed states is presented. First, an explicit granular stress-strain relation is derived that captures many relevant features of sand, including especially the Coulomb yield surface and a third-order jamming transition. Then this a...

Electrorheological (ER) and magnetorheological (MR) suspensions undergo a reverse phase transition from a liquid-like to solid-like state in response to an external electric or magnetic field, respectively. This paper briefly reviews various types of electroor magneto-responsive materials from either polymeric or inorganic and hybrid composite materials. The fabrication strategies for ER/MR can...

The objective of this thesis was to increase our understanding of two-phase geophysical flows (e.g. debris flows) by providing velocity profiles in idealized laboratory avalanches. To that end, we developed a new experimental platformmade up of an inclined flume coupled to an imaging system to measure velocity in granular suspension. The inclined flume was 3.5 m long and 10 cm wide and could be...

Colloidal suspensions aging under gravity have long been known to spontaneously separate into layers. We demonstrate through flow visualization experiments that a lateral temperature gradient as small as 10 mKycm can be responsible for such stratification and that strata correspond to a stack of convection rolls. A linear stability analysis suggests that the onset of stratification results from...

This paper presents results of a series of experiments on the settling velocity of spheres in twocomponent solid-liquid suspensions. Particular emphasis has been given to the effective values of density and viscosity of the mixture which allows us to describe the settling of the spheres in the mixture using appropriate modifications of the equations valid for the settling of spheres in pure flu...