Prediction of Mixing Pattern by Using Power Number Diagram in Baffled and Unbaffled Mixing Vessels

Kato, Yoshihito; Tada, Yutaka; Takeda, Yasuhiro; Atsumi, Naoka; Nagatsu, Yuichiro

doi:10.1252/jcej.08we281

Cited by 6 publications

(1 citation statement)

References 5 publications

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“…When small impellers such as paddles, turbine or propeller mix the fluids under low Reynolds (Re) number conditions, isolated mixing regions (IMR) like doughnutrings appear above and below the impeller. The formation of IMR structure was observed experimentally (Metzner and Taylor, 1960;Lamberto et al, 1996;Kato et al, 2010) and computationally (Desouza and Pike, 1972;Kuncewicz, 1992;Lamberto et al, 1999). Hashimoto et al (2009) revealed the existence of filaments around the IMR tori using the tracerparticle method.…”

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confidence: 92%

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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