Effective mass diffusion over cell boundaries in a Taylor-Couette flow system

Ohmura, Naoto; Kataoka, Kunio; Shibata, Yuichiro; Makino, Tsukasa

doi:10.1016/s0009-2509(97)00012-2

Cited by 48 publications

(35 citation statements)

References 24 publications

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“…In the literature, many studies suggest power laws for the evolution of the dispersion coefficient with the Re or Ta numbers (Tam and Swinney, 1987;Moore and Cooney, 1995;Ohmura et al, 1997). In these studies, the authors did not account for important flow parameters, such as the axial and the azimuthal wavelengths.…”

Section: Axial Dispersionmentioning

confidence: 99%

“…Such a flow system can be considered as a near-ideal plug-flow reactor (PFR). Many researchers have investigated the axial dispersion in Taylor-Couette flows (Tam and Swinney, 1987;Moore and Cooney, 1995;Desmet et al, 1996;Campero and Vigil, 1997;Ohmura et al, 1997;Rudman, 1998). Experimental observations referenced in the literature (Tam and Swinney, 1987;Ohmura et al, 1997) indicate that axial dispersion decreases to a minimum near the onset of Taylor vortices and increases further as the Taylor number (Ta) increases.…”

Section: Introductionmentioning

confidence: 99%

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

Nemri

Climent

Charton

et al. 2013

Chemical Engineering Research and Design

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Section: Axial Dispersionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Nemri

Climent

Charton

et al. 2013

Chemical Engineering Research and Design

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“…Several studies have been carried out on Taylor-vortex devices in batch mode, i.e. without axial flow, using tracer techniques (Tam and Swinney, 1987;Desmet et al, 1996aDesmet et al, , b, 1997Ohmura et al, 1997;Campero and Vigil, 1997), laser-optical methods (Racina et al, 2005) or chemical test reactions (Liu and Lee, 1999). In contrast to other mass transport models developed, the multi-zone model by Desmet et al (1997) takes into account that the vortices are not always perfectly mixed.…”

Section: Introductionmentioning

confidence: 99%

Effect of the rotor shape on the mixing characteristics of a continuous flow Taylor-vortex reactor

Richter

Hoffmann

Kraushaar‐Czarnetzki

2008

Chemical Engineering Science

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Macro-and micromixing in a continuous flow Taylor-vortex reactor with novel ribbed rotors were investigated and compared to the features of a classical cylindrical rotor. The characterisation was performed in a wide hydrodynamic range (40 < Ta < 2500 and 0.03 < Re < 0.51) through tracer experiments and the analysis of the rotor power consumption. Additionally, the flow patterns were visualised by using a rheoscopic fluid. The results show that the novel rotors equipped with ribs immobilise and stabilise the vortices. As compared to cylindrical rotors, micromixing is clearly enhanced while axial dispersion can be simultaneously reduced. Through the use of ribbed rotors, the operational window can be broadened considerably, in which the reactor runs at very low or moderate extent of macromixing.

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“…Since the original work of Taylor to those of Kataoka, Rudman (Rudman, 1998;Rudman et al, 2008), or Climent (Climent et al, 2007) this type of flow has received a lot of attention from the fluid mechanics community as it represents a fundamental problem for studying flow instability. This is also true in the chemical engineering field, where this flow was mainly used in the frame of mixing and precipitation studies (Desmet et al, 1996a,b;Liu and Lee, 1999;Marchisio et al, 2001;Ohmura et al, 1997Ohmura et al, , 1998Wang et al, 2005). Couette reactors are of particular interest for such studies because the flow field can be either laminar or fully turbulent whilst maintaining coherent structures named Taylor vortices.…”

Section: Introductionmentioning

confidence: 99%

A unique phenotypic modification of Lactococcus lactis cultivated in a couette bioreactor

Douaire¹,

Mercade²,

Morchain³

et al. 2010

Biotech & Bioengineering

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Batch cultures of Lactococcus lactis NCDO 2118 and IL 1403 were performed in a Couette bioreactor operated in the modulated wavy vortex flow and the turbulent regimes. This study provides an overall analysis taking into account both mechanical stress and mixing in a Couette bioreactor. A unique phenotypic aspect has been proved to occur only in the modulated wavy vortex flow regime for the two studied strains, namely that the cells become entrapped in a filamentous form. No change in the metabolic behavior of the cells has been observed. The polymeric matrix has been microscopically observed through FISH and fluorescent lectin binding, showing cells entrapped in a glycoconjugate matrix. All hypotheses regarding insufficient mixing as a cause of this phenotype have been discarded, leading to the conclusion that this particular phenotypic feature is essentially due a combined effect of mechanical stress and flow structure. Particle size measurement during the fermentation course indicates that formation of filamentous form results from a continuous aggregation started in the early stages of the cultivation. According to our results a minimum shear is required to induce the ability for cells to aggregate. Then, it appears that both flow structure and mechanical stress (shear) are responsible for the appearance of such a filamentous form. As far as the authors know, this is the first experimental evidence of a bio polymerization induced by the flow structure.

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Effective mass diffusion over cell boundaries in a Taylor-Couette flow system

Cited by 48 publications

References 24 publications

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

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

Effect of the rotor shape on the mixing characteristics of a continuous flow Taylor-vortex reactor

A unique phenotypic modification of Lactococcus lactis cultivated in a couette bioreactor

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