Rotation and shear flows are ubiquitous features of many astrophysical and geophysical bodies. To understand their origin and effect on turbulent transport in these systems, we consider a forced turbulence and investigate the combined effect of rotation and shear flow on the turbulence properties. Specifically, we study how rotation and flow shear influence the generation of shear flow (e.g., t...

The response of simulated telechelic polymers to shear is investigated. End groups of short polymeric chains form temporary junctions that are continuously broken and formed over time. As in experiments, two shear bands coexist for some shear rates. This allows us to study the microscopic differences between these shear bands. We find that the lifetime of a junction is lower in the high shear r...

In startup of steady shearing flow of two viscous unentangled liquids, namely low-molecular-weight polystyrene and -Dglucose, the shear stress catastrophically collapses if the shear rate is raised above a value coresponding to a critical initial shear stress of around 0.1-0.3 Mpa. The time-dependence of the shear stress during

Blood clots are made up of platelets and fibrin gel, and the relative amount of fibrin is strongly influenced by the shear rate. In order to explore this phenomenon, this paper presents a model of fibrin gel formation over the surface of an injured blood vessel in a shear flow. A condition for gelation including source and sink terms of polymer is derived. A simplified model of coagulation, inv...

We use Brownian dynamics simulations in combination with the umbrella sampling technique to study the effect of shear flow on homogeneous crystal nucleation. We find that a homogeneous shear rate leads to a significant suppression of the crystal nucleation rate and to an increase of the size of the critical nucleus. A simple, phenomenological extension of classical nucleation theory accounts fo...

Wormlike micelles are long wormy cylindrical aggregates of surfactants, self-assembled within a solvent, which entangle and continuously break and reform at thermal equilibrium. Rheological characterization and flow visualization experiments with micellar solutions show that under steady state shearing flow the deformation field may not remain homogeneous but instead spatially localize, resulti...

Metal spinning as a kind of manufacturing process has capability to shape hollow components. In present work shear spinning process is used to formplates into conical shapes. Moreover, the aim of this research is to demonstrate the impact of the process parameters (i.e. feeding rate and spindle speed) on wall thickness. This approachwas done by experimental and finite elements method. The resul...

2014 The apparent viscosity of dilute polymer solutions in non-inertial flows through channels consisting of successive short tubes or slits separated by expansions displays a marked divergence from shear-thinning powerlaw behaviour beyond a critical shear rate calculated for constricted sections. The product of this critical shear rate by the Rouse relaxation time was found to be nearly consta...

Understanding and treating cardiovascular disease can benefit greatly from the development of low volume, high throughput tools to study thrombosis. We have designed, fabricated, and validated a microfluidic device to induce shear rates from 4300-7100 s -1 using only 10 mL of whole blood for 4 simultaneous assays to measure occlusive thrombosis optically. Shear rates were confirmed by flow rate...

This paper deals with a theoretical study of the shear thickening effects in concentrated suspensions of non-Brownian particles. Our analysis shows that an increase of the shear rate of the suspension flow leads to a decrease of the mean thickness of the gaps between the nearest particles in dense suspensions. In turn, this leads to the growth of energy dissipation in these gaps, which means an...