Intensification of Flow Characteristics in a Laminar Flow Stirred Tank Using Modified Impeller Designs

Yek, Wei Ming; Noui‐Mehidi, Mohamed N.; Parthasarathy, Rajarathinam

doi:10.1252/jcej.09we131

Cited by 5 publications

(1 citation statement)

References 8 publications

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“…Moving the impeller up-down was carried out by Nomura et al (1997) and Kato et al (2006). Moreover, various types of impellers were designed to make unsteady flow (Kato et al, 2007;Yek et al, 2010). These previous works promote chaotic mixing to destroy the IMR.…”

Section: Introductionmentioning

confidence: 99%

Effects of Location of Baffle and Clearance between Baffle and Vessel Wall on Isolated Mixing Regions

Furukawa

Ohtani

Kato

et al. 2018

J. Chem. Eng. Japan / JCEJ

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The e ects of the location of the ba e on mixing pattern in laminar mixing is shown in this study. Decolorization experiments were conducted based on an oxidation-reduction reaction to investigate the mixing pattern. As a result, isolated mixing regions (IMR) like doughnut-rings were eliminated by setting the ba e at the optimum location, where the ba e and the IMR crossed each other. The velocity pro le was measured by using particle image velocimetry under the ba e condition. The IMR was dissipated due to making unstable circulation ow when the ba e was placed with clearance between the ba e and the wall. It was shown that using conventional mixing equipment can eliminate the IMR easily by placing the ba e with clearance.

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Section: Introductionmentioning

confidence: 99%

Effects of Location of Baffle and Clearance between Baffle and Vessel Wall on Isolated Mixing Regions

Furukawa

Ohtani

Kato

et al. 2018

J. Chem. Eng. Japan / JCEJ

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Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Kang¹,

Liu²,

Yang³

et al. 2022

Chinese Journal of Chemical Engineering

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Enhancement of laminar mixing by an anchor impeller with rotationally reciprocating motion

Komoda

Date

2022

AIP Advances

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Rotationally reciprocating mixing, in which a plate impeller slowly rotates back and forth for only half a rotation, shows excellent fluid mixing performance at Re > 40. On the other hand, since vertical flow disappears at Re < 10, two-dimensional fluid mixing proceeds in the horizontal cross section of a cylindrical vessel, producing segmented mixing regions with a pair of central poor mixing zones. In this study, we investigated the usefulness of an anchor-type impeller in the expectation of enhancing two-dimensional fluid mixing under a laminar regime by utilizing the fluid flow through the central clearances. First, we examined the effect of the clearance size on the spreading behavior of tracer particles by numerical simulation. Time series of Poincaré sections are used to classify the tracer particles depending on their spreading behavior, which is then quantified by newly defined mixing ability. It is then elucidated that even a narrow central clearance could avoid the segmentation of the mixing region, while a vast central clearance produces additional isolated mixing regions in the clearance due to stable vortex flows. The tracer particles could uniformly spread in the entire circular cross section by increasing the impeller width and adjusting the flow rate in the central and wall clearances without segmentation. Furthermore, the experimental observation of streaklines could also demonstrate that the uniformity of the fluid mixing performance is improved considerably.

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Intensification of Flow Characteristics in a Laminar Flow Stirred Tank Using Modified Impeller Designs

Cited by 5 publications

References 8 publications

Effects of Location of Baffle and Clearance between Baffle and Vessel Wall on Isolated Mixing Regions

Effects of Location of Baffle and Clearance between Baffle and Vessel Wall on Isolated Mixing Regions

Isolated mixing regions and mixing enhancement in a high-viscosity laminar stirred tank

Enhancement of laminar mixing by an anchor impeller with rotationally reciprocating motion

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