A mathematical analysis has been carried out for the axial flow of a Bingham plastic fluid, in the Concentric Cylinder Viscometer which consists of a cylindrical sample holder (the cup) and a cylindrical spindle (the bob) coaxial with the cup. The fluid to be tested flows through the annular gap of the cup and the bob system, sheared by the rotation of the inner cylinder, while the outer cy...

The present work aims to achieve optimal control of instabilities in a standard Taylor–Couette flow. motivation the study is reduce disturbance growth and delay transition process turbulence. We numerically employ using stability modifier, namely, wall transpiration. In non-modal framework, we form state-space model employing actuation by means periodic suction/blowing fluid from walls. conduct...

We numerically explore convection and general circulation of an ocean, encased in a spherical shell uniform thickness, heated from below by spatially heat flux, whose temperature at the upper surface is relaxed to freezing point water. The role salt not considered. describe phenomenology equilibrium solutions across broad range two key non-dimensional numbers: natural Rossby number, measure inf...

Dynamic random-dot displays representing a rotating cylinder were used to investigate surface interpolation in the perception of structure-from-motion (SFM) in humans. Surface interpolation refers to a process in which a complete surface in depth is reconstructed from the object depth values extracted at the stimulus features. Surface interpolation will assign depth values even in parts of the ...

In this article, thermo-elastic-behavior of a thick-walled cylinder made from a polystyrene nanocomposite reinforced with functionally graded (FG) single-walled carbon nanotubes (SWCNTs) was carried out in radial direction while subjected to a steady state thermal field. The SWCNTs were assumed aligned, straight with infinite length and a uniform layout. Two types of variations in the volume fr...

We present measurements of the angular momentum flux (torque) in Taylor-Couette flow of water between independently rotating cylinders for all regions of the (Ω1, Ω2) parameter space at high Reynolds numbers, where Ω1 (Ω2) is the inner (outer) cylinder angular velocity. We find that the Rossby number Ro = (Ω1 - Ω2)/Ω2 fully determines the state and torque G as compared to G(Ro = ∞) ≡ G∞. The ra...

Articles you may be interested in Boundary layer dynamics at the transition between the classical and the ultimate regime of Taylor-Couette flow Building on the weakly nonlinear amplitude equation of the saturated Taylor vor-tices developing in a Taylor–Couette cell with a rotating inner cylinder and a fixed outer one, the physical mechanism underlying the destabilization of these vortices resu...

The onset of thermal convection in a rotating spherical shell of intermediate radius ratio eta=0.4 is studied numerically for Taylor numbers Ta > or = 10(11) and the Prandtl number of the liquid sodium (sigma=0.01). For the first time, it is shown that at very high Taylor numbers the first unstable mode can be antisymmetric with respect to the equator and confined inside a cylinder tangent to t...

In the earth’s atmosphere baroclinic instability is responsible for the heat and momentum transport from low to high latitudes. Baroclinic instability leads to the growth of multi-scale vortices that accomplish the meridional heat transport. Raymond Hide used a rather simple laboratory experiment to study such vortices in the lab (Hide, 1953). The experiment is comprised by a cooled inner and h...