Fluid Forces on a Cylinder in Oscillating Flow : 1st Report, Sinusoidal Oscillation

Power characteristics of an unbaf¯ed aerated agitated vessel with unsteadily forwardreverse rotating impellers, ie a new type of gas±liquid agitator named`AJITER', treating viscous Newtonian liquids were studied experimentally. Measurements were ®rst made on the agitation torque, ie the torque on the drive shaft on which forward±reverse rotating impellers with four deltatype blades were attached, and the data obtained were analyzed by ®tting them to an equation consisting of two terms with respect to the resistance of the¯uid, one due to viscous drag and the other due to added moment of inertia. The effects of operating conditions and physical properties of liquids on the drag and added moment of inertia coef®cients were then evaluated, and empirical relationships which estimate values of these coef®cients, useful to predict the unsteady behavior and magnitude of agitation torque, were presented. Furthermore, equations were developed for estimating the average and maximum power consumptions as a function of the drag and added moment of inertia coef®cients. Prediction of respective power levels in AJITER by these equations was also discussed. # 2001 Society of Chemical Industry Keywords: unsteady torque; unbaf¯ed aerated agitated vessel; unsteadily rotating impeller; drag and added moment of inertia coef®cients; average and maximum power consumptions

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Power characteristics of unsteadily forward–reverse rotating impellers in an unbaffled aerated agitated vessel

Yoshida

Ito

Yamagiwa

et al. 2001

J of Chemical Tech & Biotech

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Laminar convective heat transfer from a circular cylinder exposed to a low frequency zero-mean velocity oscillating flow

Mambo

Yamamoto

Suzuki

2004

International Journal of Heat and Mass Transfer

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Liquid Flow in Impeller Region of an Unbaffled Agitated Vessel With Unsteadily Forward-Reverse Rotating Impeller

Yoshida¹,

Shigeyama²,

Hiura³

et al. 2007

Chemical Engineering Communications

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Fluid Forces on a Cylinder in Oscillating Flow : 1st Report, Sinusoidal Oscillation

Cited by 4 publications

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Power characteristics of unsteadily forward–reverse rotating impellers in an unbaffled aerated agitated vessel

Power characteristics of unsteadily forward–reverse rotating impellers in an unbaffled aerated agitated vessel

Laminar convective heat transfer from a circular cylinder exposed to a low frequency zero-mean velocity oscillating flow

Liquid Flow in Impeller Region of an Unbaffled Agitated Vessel With Unsteadily Forward-Reverse Rotating Impeller

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