Mixing in Eccentrically Located Hi-F Mixer

Nishi, Kazuhiko; Enya, Naoki; Tanaka, Yasuto; Misumi, Ryuta; Kaminoyama, Meguru

doi:10.1252/jcej.11we059

Cited by 10 publications

(1 citation statement)

References 13 publications

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“…An eccentrically located impeller generates a vertical flow, which contributes to mixing, without baffles [8,9]. If a large impeller is used at an eccentric position, it is expected that the high performance of the large impeller can be combined with the advantages of an eccentric mixer [10].…”

Section: Introductionmentioning

confidence: 99%

Potential of an asymmetrical agitation in industrial mixing

et al. 2013

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Mixing is one of the most fundamental operations in chemical engineering. Stirred tanks are widely used in the manufacture of such materials as chemicals, paints, inks, electronics materials, ceramics, foods, pharmaceuticals and cosmetics. Suitable mixing is indispensable to the purpose achievement of a process. Eccentric mixing, in which an impeller installed at eccentric position in a vessel, is one of the traditional methods of promoting mixing. An asymmetrical flow which occurs in vessel is complicated, and it promotes mixing, distribution, and mass transfer. In this study, a new mixing method which eccentric mixing using a large type impeller which attracts attention in recent years is shown. The high performance of a large impeller can be combined with the advantages of an eccentric impeller by using the impeller at an eccentric position. The power consumption and mixing time for MAXBLEND, which is a type of large impeller, were investigated. The power consumption, P, and mixing time, θM, were measured under various eccentric conditions. The relation between the power number (Np) and Reynolds number (Re) and that between the dimensionless mixing time (nθM) and Re were investigated. When eccentric mixing is used industrially, we should be concerned about the horizontal load to a agitating shaft. The large oscillating horizontal load causes serious problems, such as the falling off of the impeller or the breakage of the motor, mechanical seal or gearbox. It is, therefore, important to understand the relation between these values and the impeller rotational speed when designing the mixing equipment and determining the operating conditions. In this study, the torque and horizontal load were measured in eccentric mixing under various eccentric conditions. The averages of both, the torque and the horizontal load, and their standard deviations, corresponding to the amplitude of fluctuation, were shown.

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Section: Introductionmentioning

confidence: 99%

Potential of an asymmetrical agitation in industrial mixing

et al. 2013

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Experimental Investigation of the Power Consumption and Metzner–Otto Constant for Highly Shear-Thinning Fluids with Different Impeller Geometries

Jain,

Misumi

2024

Journal of Chemical Engineering of Japan

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Sloshing of Fluid Between Rotating Inner Vertical Shaft and Stationary Outer Casing

Yonezawa

Nishimura

Sano

et al. 2021

Journal of Fluids Engineering

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Unsteady behaviors of free surface around a rotating vertical shaft in cylindrical stationary casing were investigated. Experiments were carried out with various rotating frequency of the shaft at two initial water levels. An axi-symmetrical free surface oscillation took place when the rotational speed of the shaft became larger than a certain value. The frequency of the free surface oscillation decreased as the rotating frequency increased. A theoretical model was developed, and the mechanisms of the free surface oscillation were clarified. The oscillation was found to be a sloshing mode excited by the change of fluid angular velocity, caused by the change of wetted areas on the inner rotating shaft and outer stationary casing, associated with the change in free surface height.

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Mixing in Eccentrically Located Hi-F Mixer

Cited by 10 publications

References 13 publications

Potential of an asymmetrical agitation in industrial mixing

Potential of an asymmetrical agitation in industrial mixing

Experimental Investigation of the Power Consumption and Metzner–Otto Constant for Highly Shear-Thinning Fluids with Different Impeller Geometries

Sloshing of Fluid Between Rotating Inner Vertical Shaft and Stationary Outer Casing

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