scholarly journals Boundary-layer and interior separations in the Taylor–Couette–Poiseuille flow

2009 ◽  
Vol 50 (3) ◽  
pp. 033101 ◽  
Author(s):  
Tian Ma ◽  
Shouhong Wang
Keyword(s):  
Boundary Layer ◽  
Poiseuille Flow ◽  
Taylor Couette

Isotonic Saline Subjected to Taylor-Couette-Poiseuille Flow Demonstrates Anti-Inflammatory Activity In Vitro

2011 ◽  
Vol 127 (2) ◽  
pp. AB260-AB260 ◽  
Author(s):  
S. German ◽  
S. Ghosh ◽  
T.L. Mega ◽  
L.M. Burke ◽  
M.L. Diegel ◽  
...  
Keyword(s):  
Poiseuille Flow ◽  
Isotonic Saline ◽  
Inflammatory Activity ◽  
Taylor Couette ◽  
Anti Inflammatory

scholarly journals Taylor–Couette–Poiseuille flow with a weakly permeable inner cylinder: absolute instabilities and selection of global modes

2018 ◽  
Vol 849 ◽  
pp. 741-776
Author(s):  
Nils Tilton ◽  
Denis Martinand
Keyword(s):  
Numerical Simulations ◽  
Poiseuille Flow ◽  
Radial Flow ◽  
Temporal Frequency ◽  
Outer Cylinder ◽  
Global Mode ◽  
Permeable Membrane ◽  
Global Modes ◽  
Taylor Couette ◽  
Base Flows

Variations in the local stability of the flow in a Taylor–Couette cell can be imposed by adding an axial Poiseuille flow and a radial flow associated with one or both of the cylinders being permeable. At a given rotation rate of the inner cylinder, this results in adjacent regions of the flow that can be simultaneously stable, convectively unstable, and absolutely unstable, making this system fit for studying global modes of instability. To this end, building on the existing stability analysis in absolute modes developing over axially invariant base flows, we consider the case of axially varying base flows in systems for which the outer cylinder is impermeable, and the inner cylinder is a weakly permeable membrane through which the radial flow is governed by Darcy’s law. The frameworks of linear and nonlinear global modes are used to describe the instabilities and assess the results of direct numerical simulations using a dedicated pseudospectral method. Three different axially evolving set-ups are considered. In the first, fluid injection occurs along the full inner cylinder. In the second, fluid extraction occurs along the full inner cylinder. Besides its fundamental interest, this set-up is relevant to filtration devices. In the third, fluid flux through the inner cylinder evolves from extraction to injection as cross-flow reversal occurs. In agreement with the global mode analyses, the numerical simulations develop centrifugal instabilities above the predicted critical rotation rates and downstream of the predicted axial locations. The global mode analyses do not fully explain, however, that the instabilities observed in the numerical simulations take the form of axial stacks of wavepackets characterized by jumps of the temporal frequency.

Juice Irradiation with Taylor-Couette Flow: UV Inactivation of Escherichia coli

2004 ◽  
Vol 67 (11) ◽  
pp. 2410-2415 ◽  
Author(s):  
L. J. FORNEY ◽  
J. A. PIERSON ◽  
Z. YE
Keyword(s):  
Escherichia Coli ◽  
Boundary Layer ◽  
Couette Flow ◽  
Residence Time ◽  
Outer Cylinder ◽  
Plug Flow ◽  
Axial Flow ◽  
Grape Juice ◽  
Taylor Couette ◽  
Taylor Couette Flow

A novel reactor is described with flow characteristics that approach that of ideal plug flow but with a residence time that is uncoupled from the hydrodynamics or boundary layer characteristics. The design described consists of an inner cylinder that rotates within a stationary but larger outer cylinder. At low rotation rates, a laminar, hydrodynamic configuration called Taylor-Couette flow is established, which consists of a system of circumferential vortices within the annular fluid gap. The latter constitutes a spatially periodic flow that is the hydrodynamic equivalent to cross flow over a tube bank or lamp array. These vortices provide radial mixing, reduce the boundary layer thickness, and are independent of the axial flow rate and thus the fluid residence time. An additional feature of the rotating design is the repetitive exposure of the fluid parcels to a minimum number of lamps, which substantially reduces the maintenance requirements. Inactivation data for Escherichia coli (ATCC 15597) were recorded in commercial apple and grape juice that are relatively opaque to UV radiation. With initial E. coli concentrations of approximately 106 CFU/ml, Taylor-Couette flow was found to provide a 3- to 5-log improvement in the inactivation efficiency compared with simple channel flow between concentric cylinders.

Taylor-Couette-Poiseuille flow and heat transfer in an annular channel with a slotted rotor

2017 ◽  
Vol 112 ◽  
pp. 92-103 ◽  
Author(s):  
Nicolas Lancial ◽  
Federico Torriano ◽  
François Beaubert ◽  
Souad Harmand ◽  
Gilles Rolland
Keyword(s):  
Heat Transfer ◽  
Poiseuille Flow ◽  
Annular Channel ◽  
Flow And Heat Transfer ◽  
Taylor Couette

Axial mass transport in liquid–liquid Taylor–Couette–Poiseuille flow

2000 ◽  
Vol 55 (21) ◽  
pp. 5079-5087 ◽  
Author(s):  
Xiaoyan Zhu ◽  
Richard John Campero ◽  
R.Dennis Vigil
Keyword(s):  
Mass Transport ◽  
Poiseuille Flow ◽  
Axial Mass ◽  
Taylor Couette

The Velocity Distribution for Ferromagnetic Fluids

2013 ◽  
Vol 860-863 ◽  
pp. 1506-1509
Author(s):  
Ming Jun Li ◽  
Kai Fu Liang
Keyword(s):  
Boundary Layer ◽  
Velocity Distribution ◽  
Couette Flow ◽  
Poiseuille Flow ◽  
Magnetic Fluids ◽  
Free Electrons ◽  
Boundary Layer Equations ◽  
Ferromagnetic Fluids

The magnetic fluids are assumed non-conductive with few free electrons existing, then the boundary layer equations are obtained for two special non-conductive ferromagnetic fluids, i.e. non-conductive Poiseuille flow and Couette flow, and the velocity distribution are found to be parabolic.

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