Experimental and numerical investigation on mixing and axial dispersion in Taylor–Couette flow patterns

Nemri, Marouan; Climent, Éric; Charton, Sophie; LaNoë, J. de; Ode, Denis

doi:10.1016/j.cherd.2012.11.010

Cited by 31 publications

(30 citation statements)

References 15 publications

(26 reference statements)

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“…Previous studies Rudman (1998), Nemri et al (2012) showed that the property of non-uniqueness of TaylorCouette flow could significantly influence axial dispersion. In our previous work Nemri et al (2012), we showed that we can reach a factor 2, in terms of dispersion coefficient, for the same Reynolds number and various wave states. Rudman (1998) had also reported a factor 1.4.…”

Section: Effect Of the Wave Statementioning

confidence: 99%

“…We intended to quantify the respective role of intravortex and intervortex mixing on axial dispersion in both TVF and WVF regimes. The influence of the flow bifurcations as well as the multiplicity of wave states is also studied in order to understand the non-monotonic behavior of the axial dispersion coefficient observed in our previous study (Nemri et al 2012). …”

Section: List Of Symbols Subscriptsmentioning

confidence: 99%

“…A global dispersion coefficient D x is generally used to represent the mixing phenomena. Both numerical (Rudman 1998;Nemri et al 2012) and experimental (Nemri et al 2012) studies have revealed a significant effect of the flow state on the mixing properties. Indeed, in the wavy flow regimes (WVF and MWVF) where a multiplicity of wavy states can be achieved, D x may vary significantly for the same Reynolds number.…”

Section: List Of Symbols Subscriptsmentioning

confidence: 99%

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Experimental investigation of mixing and axial dispersion in Taylor–Couette flow patterns

et al. 2014

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. Abstract The flow and mixing in a Taylor-Couette device have been characterized by means of simultaneous particle image velocimetry and planar laser-induced fluorescence (PLIF) measurements. Concentration of a passive tracer measurements was used to investigate mixing efficiency for different flow patterns (from steady Taylor vortex flow to modulated wavy vortex flow, MWVF). Taylor-Couette flow is known to evolve toward turbulence through a sequence of flow instabilities. Macroscopic quantities, such as axial dispersion and mixing index, are extremely sensitive to internal flow structures. PLIF measurements show clear evidences of different transport mechanisms including intravortex mixing and tracer fluxes through neighboring vortices. Under WVF and MWVF regimes, intravortex mixing is controlled by chaotic advection, due to the 3D nature of the flow, while intervortex transport occurs due to the presence of waves between neighboring vortices. The combination of these two mechanisms results in enhanced axial dispersion. We show that hysteresis may occur between consecutive regimes depending on flow history, and this may have a significant effect on mixing for a given Reynolds number.

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Section: Effect Of the Wave Statementioning

confidence: 99%

Section: List Of Symbols Subscriptsmentioning

confidence: 99%

Section: List Of Symbols Subscriptsmentioning

confidence: 99%

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Experimental investigation of mixing and axial dispersion in Taylor–Couette flow patterns

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“…Moreover, a spectral analysis of the data was performed to determine the wave state (axial and azimuthal wave numbers) [28].…”

Section: Taylor-couette Apparatusmentioning

confidence: 99%

“…Intra-vortex transport is then governed by a local coefficient K c and the inter-vortex exchange by a trans- In the present study, we investigate axial dispersion in Taylor-Couette flow patterns from both local and macroscopic points of view. We focus on the mixing mechanisms controlling the axial dispersion in wavy regimes since either numerical [16,28] or experimental [28] …”

Section: Mixing In Taylor-couette Flow: State Of the Artmentioning

confidence: 99%

Mixing and axial dispersion in Taylor–Couette flows: The effect of the flow regime

Nemri

Charton

Climent

2016

Chemical Engineering Science

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The paper focuses on mixing properties of different Taylor-Couette flow regimes and their consequence on axial dispersion of a passive tracer. A joint approach, relying both on targeted experiments and numerical simulations, has been used to investigate the interaction between the flow characteristics and local or global properties of mixing. Hence, the flow and mixing have been characterized by means of flow visualization and simultaneous PIV (Particle Imaging Velocimetry) and PLIF (Planar Laser Induced Fluorescence) measurements, whereas the axial dispersion coefficient evolving along the successive flow states was investigated thanks to dye Residence Time Distribution measurements (RTD). The experimental results were complemented, for each flow pattern, by Direct Numerical Simulations (DNS), allowing access to 3D information. Both experimental and numerical results have been compared and confirmed the significant effect of the flow structure (axial wavelength of Taylor vortices and azimuthal wavenumber) on axial dispersion.

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Taylor‐Couette reactor: Principles, design, and applications

et al. 2021

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The Taylor-Couette reactor (TCR) is an apparatus that capitalizes on the Taylor-Couette flow, which allows many flow regimes and conditions to perform (bio-)chemical conversions with precise control of various reactor characteristics. With the possibility to continuously perfuse the reactor with a reaction medium, the TCR becomes interesting for chemical engineering applications. In this review we introduce this reactor type and provide an overview of its history, principles of the flow regimes, and a description and design aspects of the reactors and their elements. Available information in the literature is summarized and harmonized to present available formulas and correlations in a consistent set of variables. Additionally, a wide number of applications in process technology is covered, including reactions in homogeneous, photo and enzymatic catalysis, polymer synthesis, and crystallization and aggregation-flocculation processes. Focusing on this reactor configuration, this article intends to be used as a hub for scientific groups interested in TCRs. This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process which may lead to differences between this version and the Version of Record. Please cite this article as

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Experimental and numerical investigation on mixing and axial dispersion in Taylor–Couette flow patterns

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao.univ-toulouse.fr/ Eprints ID : 9828

Cited by 31 publications

References 15 publications

Experimental investigation of mixing and axial dispersion in Taylor–Couette flow patterns

Experimental investigation of mixing and axial dispersion in Taylor–Couette flow patterns

Mixing and axial dispersion in Taylor–Couette flows: The effect of the flow regime

Taylor‐Couette reactor: Principles, design, and applications

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