Starting Torque of Vertical Paddle Impellers

Nishi, Kazuhiko; Bando, Yuma; Misumi, Ryuta; Kaminoyama, Meguru

doi:10.1252/jcej.16we353

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…Their results of time series revealed the periodic oscillation of the torque and horizontal load. By using the CFD method, the effects of the blade width, the number of blades and the rotational speed on the starting torque of a vertical paddle impeller were explored by Nishi et al [28]. For Newtonian liquids mixed in vessels with a dished bottom, Furukawa et al [29] correlated the power consumption and mixing patterns for straight large paddle impellers.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

Ameur¹,

Kamla

Sahel

2018

Period. Polytech. Mech. Eng.

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Design of the impeller blade is a determining factor in power consumption and mixing quality, which determines consequently the cost of the mixing operation. This study explores the flow patterns and the power required for stirring a Newtonian fluid by paddle impellers. Investigations are carried out via three dimensional (3D) numerical simulations. Effects of the blade curvature, blade diameter, blade number and Reynolds number are analyzed. The curved blade is found to be more efficient to reduce the power consumption, compared with the straight blade. A new correlation is proposed for predicting the power required with two-curved-bladed impellers. The straight and very large blade creates a dead zone in the space between the blade tip and the vertical wall of vessel. This issue may be overcome by the curved blade, which increases consequently the well-mixed region size. A wider well-mixed region may be obtained with the larger curved blade, but with an additional energy cost.

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Section: Introductionmentioning

confidence: 99%

Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

Ameur¹,

Kamla

Sahel

2018

Period. Polytech. Mech. Eng.

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“…used a six‐blade paddle impeller to explore the mass transfer with chemical reactions in two‐phase liquid–liquid systems. Nishi et al . studied the effect of the blade width and the impeller rotational speed on the torque of four‐bladed vertical paddle.…”

Section: Introductionmentioning

confidence: 99%

Mixing of a Viscoplastic Fluid in Cylindrical Vessels Equipped with Paddle Impellers

Ameur¹

2017

ChemistrySelect

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The mixing characteristics of a complex fluid by paddle impellers in cylindrical reactors are explored in this paper. The working fluid has a shear thinning behavior with yield stress. The Hershel‐Bulkley model is used to describe the rheological behavior of fluid. The paddle impeller has two blades and it rotates at low Reynolds number varying in the range from 0.1 to 70. Effect of blade height (h/D=0.1, 0.4, 0.7 and 0.95), blade width (d/D=0.2, 0.4, 0.6 and 0.8) and Reynolds number on cavern size and power consumption are explored. With a great blade height, the obtained results revealed the formation of a dead zone near the blade tip at low Reynolds number. This poor mixing region disappear with a sufficient impeller rotational speed: from Rey=30 found with this kind of fluid. Two recirculation loops are observed with an excessive increased blade width (with d/D=0.8 found here). The well‐mixed region size will be enlarged with the rise of blade size, but with an additional energy cost. Also, the rise of Reynolds number permits a reduction in energy consumption and an enhancement in cavern size.

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JCEJ Outstanding Paper Award of 2017

Suzuki

Shishido

2018

J. Chem. Eng. Japan / JCEJ

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Starting Torque of Vertical Paddle Impellers

Cited by 3 publications

References 3 publications

Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

Optimization of the Operating and Design Conditions to Reduce the Power Consumption in a Vessel Stirred by a Paddle Impeller

Mixing of a Viscoplastic Fluid in Cylindrical Vessels Equipped with Paddle Impellers

JCEJ Outstanding Paper Award of 2017

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