We present local velocity measurements in emulsions under shear using heterodyne Dynamic Light Scattering. Two emulsions are studied: a dilute system of volume fraction phi = 20% and a concentrated system with phi = 75%. Velocity profiles in both systems clearly show the presence of wall slip. We investigate the evolution of slip velocities as a function of shear stress and discuss the validity...

We numerically study the effect of solid boundaries on the swimming behavior of a motile microorganism in viscoelastic media. Understanding the swimmer-wall hydrodynamic interactions is crucial to elucidate the adhesion of bacterial cells to nearby substrates which is precursor to the formation of the microbial biofilms. The microorganism is simulated using a squirmer model that captures the ma...

Particle–wall interactions have broad biological and technological applications. In particular, some artificial microswimmers capitalize on their translation–rotation coupling near a wall to generate directed propulsion. Emerging biomedical applications of these in complex fluids prompt questions the impact non-Newtonian rheology this work, we report intriguing effects shear-thinning rheology, ...

We study the propagation of a plane-strain hydraulic fracture driven by shear thinning fluid following Carreau rheology. restrict to impermeable medium case and quantify in details impact on growth shear-thinning properties between low high shear-rates Newtonian limits. derive several dimensionless numbers governing evolution solution. The notably depends ratio two limiting viscosities, index, ...

The progressive and enhanced thermal mechanisms of nanoparticles has motivated researchers to give attention this topic in recent years. synthesizing versatile applications such materials include cooling heating controlling processes, solar systems, energy production, nanoelectronics, hybrid-powered motors, cancer treatments, renewable systems. Moreover, the bioconvection nanofluids allows for ...

We investigate the effects of fluid elasticity on the dynamics of filament thinning and drop breakup processes in a cross-slot microchannel. Elasticity effects are examined using dilute aqueous polymeric solutions of molecular weight (MW) ranging from 1.5×103 to 1.8×107. Results for polymeric fluids are compared to those for a viscous Newtonian fluid. The shearing or continuous phase that induc...