scholarly journals Turbulent Taylor-Couette vortex flow between large radius ratio concentric cylinders

2004 ◽  
Vol 36 (3) ◽  
pp. 419-421 ◽  
Author(s):  
W. M. J. Batten ◽  
S. R. Turnock ◽  
N. W. Bressloff ◽  
S. M. Abu-Sharkh
Keyword(s):  
Vortex Flow ◽  
Radius Ratio ◽  
Large Radius ◽  
Concentric Cylinders ◽  
Taylor Couette

Flow Model for Large Radius-Ratio Magnetic Annular Shock-Tube Operation

1962 ◽  
Vol 5 (5) ◽  
pp. 632 ◽  
Author(s):  
F. J. Fishman ◽  
H. Petschek
Keyword(s):  
Shock Tube ◽  
Flow Model ◽  
Radius Ratio ◽  
Large Radius

A flow visualization and superposition rheology study of shear-banding wormlike micelle solutions

Soft Matter ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 1051-1061 ◽  
Author(s):  
Hadi Mohammadigoushki ◽  
Susan J. Muller
Keyword(s):  
Diffusion Coefficient ◽  
Flow Visualization ◽  
Correlation Length ◽  
Micellar Solution ◽  
Shear Banding ◽  
Shear Bands ◽  
Wormlike Micelle ◽  
Concentric Cylinders ◽  
Stress Diffusion ◽  
Taylor Couette

In this paper, we use rheometry and flow visualization to study the dynamics of the interface between shear bands in a wormlike micellar solution sheared between concentric cylinders, i.e., in a Taylor–Couette (TC) cell, and to evaluate the stress diffusion coefficient and the stress correlation length in the Johnson–Segalman model.

Visualization of Dispersed Phase Flow in Centrifugal Extractor Using Taylor-Couette Vortex Flow

2011 ◽  
Author(s):  
Hideharu Takahashi ◽  
Hiroshige Kikura ◽  
Kenji Takeshita ◽  
Masanori Aritomi
Keyword(s):  
Flow Field ◽  
Vortex Flow ◽  
Flow Characteristics ◽  
Metal Extraction ◽  
Dispersed Phase ◽  
Cylinder Surface ◽  
Centrifugal Extractor ◽  
Hydrophobic Coating ◽  
Measurement And Analysis ◽  
Taylor Couette

For studying the designs and running operations of an extractor which uses Taylor-Couette vortex flow, we focused on a metal extraction system as one of the extraction models of heat generating nuclides and observed the flow patterns of dispersed phase by dyeing the phase in the extractor, and we investigated the effects of hydrophobic coating applied to the inner cylinder surface on the flow characteristics. Moreover, for the quantitative measurement and analysis of the flow field, we evaluated the applicability of Ultrasonic Velocity Profiler (UVP) to flow field measurement. Thorough these visualization methods of dispersed phase in a centrifugal extractor using Taylor-Couette vortex flow, we examined the relation between flow field and extraction characteristics of the extractor.

Periodic Velocity Measurements in a Wide and Large Radius Ratio Automotive Torque Converter at the Pump/Turbine Interface

2002 ◽  
Author(s):  
S. O. Kraus ◽  
R. Flack ◽  
A. Habsieger ◽  
G. T. Gillies ◽  
K. Dullenkopf
Keyword(s):  
Flow Field ◽  
Turbine Blade ◽  
Torque Converter ◽  
Operating Conditions ◽  
Radius Ratio ◽  
Small Radius ◽  
Large Radius ◽  
Pump Turbine ◽  
Turbine Inlet ◽  
Significant Difference

The unsteady flow field due to blade passing at the pump/turbine interface of a torque converter was studied. The current geometry is wide and has a large outer to inner radius ratio. A laser velocimeter was used to measure the periodic velocity components at four operating conditions determined by the speed ratios between the turbine and pump of 0.065 (near stall), 0.600, 0.800, and 0.875 (coupling point). The flow fields at the pump exit and turbine inlet planes were visualized and are presented. Using instantaneous pump and turbine blade positions with the velocity data, animations (“slow-motion movies”) are generated to effectively visualize and understand the unsteady behavior. The turbine inlet flow was markedly periodic due to the exiting jet/wake from the upstream pump passage; however, the pump exit flow field showed little dependence on the turbine blade positions. The highest unsteadiness was seen for the highest speed ratios. Four “shots” from the sequences of one cycle for all speed ratios and each plane are presented herein. The results are also compared to unsteady results for a previously examined torque converter with a small radius ratio to determine the effect of parametric geometric changes on the flow field. Generally, the unsteady velocity fields show no significant difference for the two geometries — the trends are the same.

scholarly journals Cultivation of the photosynthesis microorganism in a Taylor-Couette Vortex Flow with a small aspect ratio

2009 ◽  
Vol 147 ◽  
pp. 012073
Author(s):  
H Kawai ◽  
S Yasui ◽  
H Takahashi ◽  
H Kikura ◽  
M Aritomi
Keyword(s):  
Aspect Ratio ◽  
Vortex Flow ◽  
Small Aspect Ratio ◽  
Taylor Couette

The effect of radius ratio on the stability of Couette flow and Taylor vortex flow

1984 ◽  
Vol 27 (10) ◽  
pp. 2403 ◽  
Author(s):  
R. C. DiPrima ◽  
P. M. Eagles ◽  
B. S. Ng
Keyword(s):  
Couette Flow ◽  
Vortex Flow ◽  
Radius Ratio ◽  
Taylor Vortex ◽  
Taylor Vortex Flow ◽  
The Stability

On the Stability of Taylor - Couette Flow With Axial Flow

2012 ◽  
Author(s):  
Emna Berrich ◽  
Fethi Aloui ◽  
Jack Legrand
Keyword(s):  
Flow Direction ◽  
Axial Flow ◽  
Diffusion Method ◽  
Diffusion Limit ◽  
Taylor Flow ◽  
Concentric Cylinders ◽  
Reflected Light ◽  
Helical Vortices ◽  
Taylor Couette ◽  
The Stability

An experimental investigation of Taylor-Couette flows with axial flow is presented. Two techniques are used: Visualization using the Kalliroscope and Electro-diffusion method using electrochemical probes. The fluid is confined between concentric cylinders. It is constituted by an electrochemical solution seeding with 2% of a rheoscopic liquid AQ-1000 (Kalliroscope Corp., U.S.A.). The rheoscopic liquid contains small particles reflecting light in dependence on their orientation imposed by the flow direction. The reflected light intensity of Kalliroscope flakes allows a qualitative study of the flow. While the polarography technique allows the measurement of diffusion limit current intensities delivered by the electrochemical probes. The frequency responses of the probe to the flow allow the determination of the instantaneous and local mass transfer and the instantaneous wall shear rate. Two protocols were adopted to study the effect of an axial flow superposed to Couette-Taylor flows and the history flow effect. The first one consists to impose an azimuthal flow to the inner cylinder. When the regime was established, we superposed the axial flow. This protocol was named “the direct protocol”. While the second protocol consists to impose firstly the axial flow on the gap of the system then the azimuthal flow. We named it “the inverse protocol”. We demonstrated that the Couette-Taylor flow with axial flow is strongly dependent on the flow history (the protocol). For the same Taylor number and axial Reynolds number, the resulting flow is completely different. An axial flow superposed to Couette-Taylor flow can delay the instabilities apparition; generate the displacement of the Taylor vortices in the same direction as the axial flow or in the opposite direction; and modify the instability character of the flow by developing helical vortices or wavy helical vortices.

scholarly journals Effect of the number of vortices on the torque scaling in Taylor–Couette flow

2014 ◽  
Vol 748 ◽  
pp. 756-767 ◽  
Author(s):  
B. Martínez-Arias ◽  
J. Peixinho ◽  
O. Crumeyrolle ◽  
I. Mutabazi
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Couette Flow ◽  
Scaling Laws ◽  
Taylor Vortex ◽  
Large Radius ◽  
Aspect Ratios ◽  
Taylor Vortex Flow ◽  
Taylor Couette ◽  
Taylor Couette Flow

AbstractTorque measurements in Taylor–Couette flow, with large radius ratio and large aspect ratio, over a range of velocities up to a Reynolds number of 24 000 are presented. Following a specific procedure, nine states with distinct numbers of vortices along the axis were found and the aspect ratios of the vortices were measured. The relationship between the speed and the torque for a given number of vortices is reported. In the turbulent Taylor vortex flow regime, at relatively high Reynolds number, a change in behaviour is observed corresponding to intersections of the torque–speed curves for different states. Before each intersection, the torque for a state with a larger number of vortices is higher. After each intersection, the torque for a state with a larger number of vortices is lower. The exponent, from the scaling laws of the torque, always depends on the aspect ratio of the vortices. When the Reynolds number is rescaled using the mean aspect ratio of the vortices, only a partial collapse of the exponent data is found.

Instabilities and Transition to Chaos in Flows between Concentric Cylinders

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
Aomar Ait Aider
Keyword(s):  
Visual Observation ◽  
Experimental Investigations ◽  
Flow Measurements ◽  
Dean Flow ◽  
Concentric Cylinders ◽  
Computational Fluid Dynamics Analysis ◽  
Long Time ◽  
Taylor Couette ◽  
Geometrical Effects ◽  
Cylinder Rotation

How does turbulence rise? For a long time, a century, the Taylor-Couette system was a paradigm for the researchers who tried to get answers to this question. Fascinating structures and patterns observed in the flow have attracted the interest of many researchers, both experimentalists and theorists. During the last century, many works were done on the closed Taylor-Couette systems. At the end of the seventies, after thousands of contributions, experiments performed in the Taylor-Couette system confirmed a theoretical analysis which concluded that a finite number of instabilities, two or three, are sufficient to lead to chaos or weak turbulence. Our own experiments were conducted at that time on a Taylor-Couette system with a moderate aspect ratio. They were analyzed from visual observation and fine local measurement with an electrochemical method. Scalar time series and data pointed out the frequencies characteristic of the flow. Many geometrical effects are considered by researchers. When the gap is horizontal and not completely filled, the flow obtained is called Taylor-Dean flow. We obtained similar flow in an azimuthally open Taylor-Couette system where a combination of the inner cylinder rotation and external fluid pumping, the Dean flow, produces the so called Taylor-Dean flow. Measurements and analysis were carried out by visualization and Laser Doppler Velocimetry. In addition to the experimental approach, we used Computational Fluid Dynamics analysis to complete the flow study. Numerical and experimental investigations reveal a class of instabilities of the Taylor-Dean flow not previously observed in the Taylor-Couette flow due to the cylinder rotation neither in the Dean flow due to the external pumping fluid.

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