We study the linearized stability of shear flow satisfying Navier slip boundary conditions. The Orr-Sommerfeld equation for the plane Poiseuille flow with Navier slip boundary conditions is solved numerically by the Chebyshev collocation method. Our numerical results show that slip at the boundary increases the critical Reynolds number Rc for instability. The dependence of the this critical Rey...

INTRODUCTION: Initial implant stability is crucial to cementless knee replacement success, however the optimal design remains elusive. Previous biomechanical studies have aimed at quantifying initial stability using simplified loading scenarios. The objective of this study was to use a physiological relevant methodology which incorporates torsion, shear and compression forces to evaluate tibial...

The stability of ideal MHD ballooning modes in the presence of sheared flow is investigated for three-dimensional equilibria. Application of ballooning formalism reduces the problem to a partial differential equation in three dimensions that can be solved in the limit of small flow. Analytic calculations demonstrate the stabilizing effect of shear flow. The derived stability criterion generaliz...

The dynamical shear instability is an important mixing process in the advanced stages of the evolution of massive stars. We calculated different models of 15 M⊙ with an initial rotational velocity, υini = 300 km/s to investigate its efficiency. We found that the dynamical shear instability has a timescale shorter than Oxygen burning timescale and that it slightly enlarges the convective zones a...

This paper presents the results of a series of hollow cylinder tests carried out to investigate the role of drainage conditions on the response of railway track foundation materials during cyclic loading. Three sand–clay mixes were tested. It was found that, below a certain cyclic shear stress threshold, and depending on the drainage conditions, changes in principal stress direction should not ...

OBJECTIVE In endothelial cells exposed to unidirectional laminar shear stress, endothelial nitric oxide synthase transcription (eNOS), mRNA stability, and protein levels are enhanced. We have previously demonstrated that these changes are associated with increased 3' polyadenylation of eNOS mRNA. Here, we investigated the effect of laminar shear stress on the phosphorylation and localization of...

Vorticity banding under steady shear flow is observed in a suspension of semiflexible colloidal rods (fd virus particles) within a part of the paranematic-nematic biphasic region. Banding occurs uniformly throughout the cell gap within a shear-rate interval (.gamma-, .gamma+) , which depends on the fd concentration. For shear rates below the lower-border shear rate .gamma- only shear elongation...

utilization of non-food-grade organic solvents and high shear forces in conventional liposome formation techniques has limited their applications as carriers of nutrecuticals in food industry. the objective of this research is the production of gamma-oryzanol bearing nanoliposome by using modified thermal method. nanoliposomes were produced by a suitable concentration of lecithin and gamma-oryz...

Earth-fill dams stability in steady state seepage condition is very important, especially during earthquakes. Numerical software analyses require accurate and realistic modeling of construction stages. Since earth-fill dams are constructed in different layers, so these conditions should be considered in software modeling to achieve a reasonable design. In this study, an earth-fill dam is modele...

The mechanical properties of microscopic particles have been a heated research object for it takes the deformation of micro-beads in the microfluidic environment into account. Sufficient knowledge on mechanical properties of micro-beads would lead to better device design and application for cell mechanics, tissue engineering, etc. The physical properties of alginate beads were examined both in ...