Heat/mass transfer in taylor vortex flow with constant axial flow rates

Kataoka, Kunio; Doi, Hideki; Komai, Takeshi

doi:10.1016/0017-9310(77)90084-9

Cited by 121 publications

(63 citation statements)

References 13 publications

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“…Intravortex mixing consists in both circumferential mixing and meridional mixing. For TVF flow (Kataoka et al 1975(Kataoka et al , 1977Kataoka and Takigawa 1981), highlighted the existence of a weak intercell exchange which justify the assumption of considering each vortex as an independent cell. In order to model axial dispersion, most studies have used either the one-dimensional diffusion model or the multi-stirred tanks in series model (Kataoka et al 1975;Tam and Swinney 1987;Moore and Cooney 1995).…”

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confidence: 99%

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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confidence: 99%

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

et al. 2014

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“…The determination of the Péclet number showed that the axial dispersion coefficient in the torus reactor is nearly constant whatever the operating mode and the flow regime. The axial dispersion is close to that obtained in vortex flows which are characterized by well-defined flow structures [13] and allows good mass and heat transfers. However, despite its interest in reactor running modelling, especially when reactions are occurring, such kind of investigation gives only a general representation of the flow in the geometry.…”

Section: Introductionmentioning

confidence: 69%

Mixing and hydrodynamics investigation using CFD in a square-sectioned torus reactor in batch and continuous regimes

Pramparo

Pruvost

Stüber

et al. 2008

Chemical Engineering Journal

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“…It is well known that the onset of secondary flow results in the increase of the rate of mass transfer [5]. The experimental works carried out with the anemometric technique show that the greatest sensitivity of measurements is obtained at the surface of the inner cylinder [6].…”

Section: Experimental Methodsmentioning

confidence: 99%

Experimental investigations of the stability limit of the helical flow of pseudoplastic liquids

Wroński

Jastrzębski

1990

Rheol Acta

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The stability of the laminar helical flow of pseudoplastic liquids has been investigated with an indirect method consisting in the measurement of the rate of mass transfer at the surface of the inner rotating cylinder. The experiments have been carried out for different values of the geometric parameter rl = R 1 / R 2 (the radius ratio) in the range of small values of the Reynolds number, Re < 200. Water solutions of CMC and MC have been used as pseudoplastic liquids obeying the power law model. The results have been correlated with the Taylor and Reynolds numbers defined with the aid of the mean viscosity value. The stability limit of the Couette flow is described by a functional dependence of the modified critical Taylor number (including geometric factor) on the flow index n. This dependence, general for pseudoplastic liquids obeying the power law model, is close to the previous theoretical predictions and displays destabilizing influence of pseudoplasticity on the rotational motion. Beyond the initial range of the Reynolds numbers values (Re> 20), the stability of the helical flow is not affected considerably by the pseudoplastic properties of liquids. In the range of the monotonic stabilization of the helical flow the stability limit is described by a general dependence of the modified Taylor number on the Reynolds number. The dependence is general for pseudoplastic as well as Newtonian liquids. The m e t h o d applied to the experimental investigations is based on the m e a s u r e m e n t o f the rate of mass transfer at the surface o f the inner cylinder.

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Heat/mass transfer in taylor vortex flow with constant axial flow rates

Cited by 121 publications

References 13 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 hydrodynamics investigation using CFD in a square-sectioned torus reactor in batch and continuous regimes

Experimental investigations of the stability limit of the helical flow of pseudoplastic liquids

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