The first structures were proto-voids formed in the primordial plasma when viscous forces first matched gravitational forces at the Hubble, or horizon, scale of causal connection LH ≡ ct ≈ LSV ≡ (γν/ρG) , where t ≈ 30 000 years was the age of the universe, c the speed of light, γ ≈ 1/t the rate of strain, ν the kinematic viscosity, and LSV Gibson’s 1996 viscous Schwarz scale. At that time the p...

steady hydromagnetic couette flow of class-ii of a viscous, incompressible and electrically conducting fluid through a porous medium in a rotating system taking hall current into account is investigated. heat transfer characteristics of the fluid flow are considered taking viscous and joule dissipations into account. it is noticed that there exists flow separation at the moving plate in the sec...

Previous experimental measurements and linear stability analyses of curvilinear shearing flows of viscoelastic fluids have shown that the combination of streamwise curvature and elastic normal stresses can lead to flow destabilization. Torsional shear flows of highly elastic fluids with closed streamlines can also accumulate heat from viscous dissipation resulting in nonuniformity in the temper...

Topology optimization offers optimal material layouts, enabling automation in the design of devices. Given recent advances computer technology and additive manufacturing, topology is increasingly being used to complex porous structures, for example, microfluidic For flow fluids such miniature-sized viscous shearing stress will be significant. But Darcy model -- most popular mathematical describ...

Viscous fluid can micro-rotate due to collisions between particles that affect viscous fluid's velocity and temperature.This study aims determine the effect of viscosity parameters, micro-rotation materials, heat sources on temperature. The model laminar flow equation for in this uses laws physics, namely, law conservation mass, Newton II, Thermodynamics I. formed dimensional equations are conv...

Abstract In continuum mechanics, viscous materials are those that lack rigidity and elastic response under shear stress. We argue using the term to refer aseismic lithosphere is thus a misnomer because it denies propagation of S waves through in total contradiction decades seismic surveys. Similarly, yield stress, which another feature expected most situations within but more difficult assess. ...

We demonstrate a novel instability found within unconfined viscous bands/rims, or free-surface flows involving longitudinal viscosity contrast. Such instabilities may be described as banding instabilities, non-porous fingering of the intrusion less fluid into band more fluid. A consequence this work is that widely known to occur in porous media following seminal Saffman & Taylor ( Proc. R. ...

Recent investigations on the collapse and growth of macroscopic cavity regions in a granular material due to viscous flow have revealed the possible mechanism of the occurrence of natural disasters such as landslides, collapses of riverbanks and cliffs. We have already shown both theoretically and experimentally a significant effect of flow concentration into the macroscopic cavity regions in a...