following recent works of several authors like huilgol, bhattacharya etd. and javadpour et al., this paper is to contribute further to the literature of axial flow in a rotational coaxial rheometer. we consider axial flow of herschel bulkley mode1 between two concentric cylinders with the inner one rotating, while the outer cylinder is held stationary. an attempt has been made to direct the ana...

The present paper provides a mathematical model for particle motion in viscous flow between rotating cylinders. Using an assumption that the mass fraction of particles in the flow is small, so the perturbations of the mean liquid flow due to the presence of particles is negligible, 3D liquid flow was simulated using an exact solution of the Navier-Stokes equations. Particle motion under action ...

A nonlinear stability analysis by Demay and looss [J. Mec. Theor. Appl. , special issue, p. 193 (1984)] of flow between concentric rotating cylinders (the Couette-Taylor system) predicted a transition from the basic flow to a state with ribbons, which are traveling waves in the azimuthal direction but standing waves in the axial direction. We have observed the transition to ribbons in laborator...

• Breaking the symmetry of material with sonic crystals to generate acoustic hooks. It has been demonstrated numerically that hooks obtained can be tunable. Potential applications in ultrasonic devices for manipulation or capture objects. In this paper we present a new way obtain tunable The breaking composition is used generation from Janus cylinders. This fact possible by using vary refractiv...

We present a physical explanation of turbulent bursts in the flow between concentric, rotating cylinders (Couette-Taylor flow), based on fully resolved direct numerical calculations. The bursts are a temporal oscillation between a spatially laminar flow and turbulence, discovered experimentally by Hamill et al. The onset of turbulence is shown to be due to a linear instability of the spiral flo...

Granular surface flows are common in industrial practice and natural systems, however, theoretical description of such flows is at present incomplete. Two prototype systems involving surface flow are compared: heap formation by pouring at a point and rotating cylinders. Continuum models for analysis of these flows are reviewed, and experimental results for quasi-2D systems are presented. Experi...

Relevance. From the theory of hydrodynamics, it is known about interaction a pair vortices in inviscid fluids. The relevance study conditioned upon presence many studies numerical simulations interactions two or cylinders, but lack research practical installations for observing effects attraction and repulsion fluid media may slow down this area application. Purpose. purpose demonstration possi...

Analytical solutions corresponding to the starting flow of an Oldroyd-B fluid between rotating cylinders are established. If the radius of the inner cylinder tends to zero the flow within a circular cylinder is obtained. The well-known solutions for a Navier-Stokes fluid, as well as those corresponding to a Maxwell fluid and to a second grade one, appear as limiting cases of our solutions. The ...