Taylor-Couette Vortex Flow in Enzymatic Reactors

2006 ◽  
pp. 321-332 ◽  
Author(s):  
Roberto Campos Giordano ◽  
Raquel de Lima Camargo Giordano
Keyword(s):  
Vortex Flow ◽  
Taylor Couette

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.

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

scholarly journals 1903 Analysis of a Taylor-Couette Vortex Flow with a Small Aspect Ratio

2010 ◽  
Vol 2010 (0) ◽  
pp. 525-526
Author(s):  
Hideki KAWAI ◽  
Akihiro NAGAI ◽  
Hiroshige KIKURA
Keyword(s):  
Aspect Ratio ◽  
Vortex Flow ◽  
Small Aspect Ratio ◽  
Taylor Couette

Experimental Investigations of the Surface Groove Effect in Taylor-Couette-Poiseuille Flow

2020 ◽  
Author(s):  
Lamia Gaied ◽  
Fethi Aloui ◽  
Marc Lippert ◽  
Emna Berrich
Keyword(s):  
Couette Flow ◽  
Vortex Flow ◽  
Axial Flow ◽  
Vortex Structures ◽  
Base Flow ◽  
Taylor Vortex ◽  
Experimental Investigations ◽  
Surface Groove ◽  
Taylor Couette ◽  
The Impact

Abstract In this paper, we investigate the effects of an imposed axial flow on hydrodynamic instabilities’ Couette-Taylor flow in the case where the wall of the inner cylinder of the system is grouved. Without imposed axial flow, the basic flow of a fluid between two coaxial cylinders known by Couette flow, which is characterized by several temporal and spatial symmetries. The increase in the rotation causes the breaking of these symmetries. In both cases where the surface of the inner cylinder is smooth and grooved, five different flow regimes can be determined: Taylor vortex flow (TVF), wavy vortex flow (WVF), and Modulated Wavy vortex flow (MWVF). Each time the flow passes from one hydrodynamic regime to another until it enters a state of turbulence, which is characterized by the destruction of all the symmetries that existed at the beginning. In addition, when an axial flow is imposed on a Taylor-Couette flow, new helical vortex structures are observed in both cases (with and without surface groove). The influence of surface structures (grooves) on the shear stress of the wall is discussed with and without axial base flow. A spatio-temporal description of several flow models was obtained using firstly, a visualization’s qualitative study using kalliroscope particles. Secondly, a quantitative study by polarography using simple probes have been used to characterize the impact of vortex structures on the Couette-Taylor flows without and with an axial flow on the transfer.

1103 Magnetic field control of mode bifurcation on magnetic fluid Taylor-Couette vortex flow with small aspect ratio

2005 ◽  
Vol 2005 (0) ◽  
pp. 159
Author(s):  
Daisuke ITO ◽  
Toshikazu KOTAKA ◽  
Hiroshige KIKURA ◽  
Masanori ARITOMI ◽  
Yasushi TAKEDA
Keyword(s):  
Magnetic Field ◽  
Aspect Ratio ◽  
Magnetic Fluid ◽  
Vortex Flow ◽  
Small Aspect Ratio ◽  
Field Control ◽  
Taylor Couette

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

Suspension Taylor–Couette flow: co-existence of stationary and travelling waves, and the characteristics of Taylor vortices and spirals

2019 ◽  
Vol 870 ◽  
pp. 901-940 ◽  
Author(s):  
Prashanth Ramesh ◽  
S. Bharadwaj ◽  
Meheboob Alam
Keyword(s):  
Reynolds Number ◽  
Velocity Field ◽  
Couette Flow ◽  
Vortex Flow ◽  
Travelling Waves ◽  
Taylor Vortex ◽  
Taylor Vortices ◽  
Spiral Vortex ◽  
Taylor Couette ◽  
Taylor Couette Flow

Flow visualization and particle image velocimetry (PIV) measurements are used to unravel the pattern transition and velocity field in the Taylor–Couette flow (TCF) of neutrally buoyant non-Brownian spheres immersed in a Newtonian fluid. With increasing Reynolds number ($Re$) or the rotation rate of the inner cylinder, the bifurcation sequence in suspension TCF remains same as in its Newtonian counterpart (i.e. from the circular Couette flow (CCF) to stationary Taylor vortex flow (TVF) and then to travelling wavy Taylor vortices (WTV) with increasing $Re$) for small particle volume fractions ($\unicode[STIX]{x1D719}<0.05$). However, at $\unicode[STIX]{x1D719}\geqslant 0.05$, non-axisymmetric patterns such as (i) the spiral vortex flow (SVF) and (ii) two mixed or co-existing states of stationary (TVF, axisymmetric) and travelling (WTV or SVF, non-axisymmetric) waves, namely (iia) the ‘TVF$+$WTV’ and (iib) the ‘TVF$+$SVF’ states, are found, with the former as a primary bifurcation from CCF. While the SVF state appears both in the ramp-up and ramp-down experiments as in the work of Majji et al. (J. Fluid Mech., vol. 835, 2018, pp. 936–969), new co-existing patterns are found only during the ramp-up protocol. The secondary bifurcation TVF $\leftrightarrow$ WTV is found to be hysteretic or sub-critical for $\unicode[STIX]{x1D719}\geqslant 0.1$. In general, there is a reduction in the value of the critical Reynolds number, i.e. $Re_{c}(\unicode[STIX]{x1D719}\neq 0)<Re_{c}(\unicode[STIX]{x1D719}=0)$, for both primary and secondary transitions. The wave speeds of both travelling waves (WTV and SVF) are approximately half of the rotational velocity of the inner cylinder, with negligible dependence on $\unicode[STIX]{x1D719}$. The analysis of the radial–axial velocity field reveals that the Taylor vortices in a suspension are asymmetric and become increasingly anharmonic, with enhanced radial transport, with increasing particle loading. Instantaneous streamline patterns on the axial–radial plane confirm that the stationary Taylor vortices can indeed co-exist either with axially propagating spiral vortices or azimuthally propagating wavy Taylor vortices – their long-time stability is demonstrated. It is shown that the azimuthal velocity is considerably altered for $\unicode[STIX]{x1D719}\geqslant 0.05$, resembling shear-band type profiles, even in the CCF regime (i.e. at sub-critical Reynolds numbers) of suspension TCF; its possible role on the genesis of observed patterns as well as on the torque scaling is discussed.

Performance of a continuous Taylor–Couette–Poiseuille vortex flow enzymic reactor with suspended particles

2000 ◽  
Vol 35 (10) ◽  
pp. 1093-1101 ◽  
Author(s):  
Raquel L.C Giordano ◽  
Roberto C Giordano ◽  
Charles L Cooney
Keyword(s):  
Vortex Flow ◽  
Suspended Particles ◽  
Taylor Couette

scholarly journals Absolute instabilities in eccentric Taylor–Couette–Poiseuille flow

2014 ◽  
Vol 741 ◽  
pp. 543-566 ◽  
Author(s):  
Colin Leclercq ◽  
Benoît Pier ◽  
Julian F. Scott
Keyword(s):  
Vortex Flow ◽  
Energy Analysis ◽  
Outer Cylinder ◽  
Axial Flow ◽  
Helical Structures ◽  
Left Handed ◽  
Absolute Growth Rate ◽  
Absolute Growth ◽  
Taylor Couette ◽  
Annular Clearance

AbstractThe effect of eccentricity on absolute instabilities (AI) in the Taylor–Couette system with pressure-driven axial flow and fixed outer cylinder is investigated. Five modes of instability are considered, characterized by a pseudo-angular order $m$, with here $\vert m\vert \leq 2$. These modes correspond to toroidal ($m=0$) and helical structures ($m\neq 0$) deformed by the eccentricity. Throughout the parameter range, the mode with the largest absolute growth rate is always the Taylor-like vortex flow corresponding to $m=0$. Axial advection, characterized by a Reynolds number ${\mathit{Re}_z}$, carries perturbations downstream, and has a strong stabilizing effect on AI. On the other hand, the effect of the eccentricity $e$ is complex: increasing $e$ generally delays AI, except for a range of moderate eccentricites ${0.3\lesssim e \lesssim 0.6}$, where it favours AI for large enough ${\mathit{Re}_z}$. This striking behaviour is in contrast with temporal instability, always inhibited by eccentricity, and where left-handed helical modes of increasing $\vert m\vert $ dominate for larger ${\mathit{Re}_z}$. The instability mechanism of AI is clearly centrifugal, even for the larger values of ${\mathit{Re}_z}$ considered, as indicated by an energy analysis. For large enough ${\mathit{Re}_z}$, critical modes localize in the wide gap for low $e$, but their energy distribution is shifted towards the diverging section of the annulus for moderate $e$. For highly eccentric geometries, AI are controlled by the minimal annular clearance, and the critical modes are confined to the vicinity of the inner cylinder. Untangling the AI properties of each $m$ requires consideration of multiple pinch points.

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