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

Ishiwata, Ryozo; Ohashi, Hideo

doi:10.1299/jsme1958.27.1881

Cited by 3 publications

(3 citation statements)

References 1 publication

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“…According to previous works on the bluff bodies such as a circular cylinder and sphere oscillating in liquids at rest,5–9 the equation with the Reynolds number gives the relationships between the drag or added mass coefficients and oscillating parameters and physical properties of liquids. The Reynolds number characterizing the flow in an agitated vessel, ie the impeller Reynolds number, Re m , is defined with the characteristic length of the diameter of the impeller, D i , and the characteristic velocity of the product of D i and rotation rate of the impeller, N r , by the following equation: where ν is the kinematic viscosity of liquid.…”

Section: Resultsmentioning

confidence: 99%

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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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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Section: Resultsmentioning

confidence: 99%

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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“…In their results, they identified eight regimes of the flow patterns and found the longitudinal flow structures called ''streaked flow'' and ''tubes'' appearing intermittently around the object. Ishiwata and Ohashi [7] have investigated the fluid force acting on a cylinder in an oscillating flow condition, while Okajima et al [8] have carried out flow visualization for both of circular and square cylinders. Classification of flow structures has been made in the latter study.…”

Section: Introductionmentioning

confidence: 99%

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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“…Works of Bearman etal. (1985) as well as Ishiwata and Ohashi (1984) discuss the forces on the cylinder in dependence on the Keulegan Carpenter number. Barbi et al (1986) find vortex shedding in oscillatory flows at half the driving frequency and the driving frequency itself.…”

Section: Introductionmentioning

confidence: 99%

Phenomenology of Kármán vortex streets in oscillatory flow

Detemple-Laake¹,

Eckelmann²

1989

Experiments in Fluids

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Abstract. Vortex wakes of circular cylinders at low Reynolds numbers have bee n investigated. Sound waves are superimposed on the flow in mean flow direction. In this configuration the ICdtrmhn vortices are shed at the sound frequency or at subharmonics of the sound frequency. The K~rm~n vortex street is treated as a nonlinear self-excited flow oscillator with forced oscillations. Using a flow visualization technique a variety of wake structures has been identified as a function of sound frequency and sound amplitude, but independent of the Reynolds number. The superimposed sound influences the distribution of circulation and accordingly the shedding mechanism. Primary vortex and secondary vortex are shed simultaneously from one side of the cylinder. The alternate vortex shedding is arranged spatially and temporally. Structures along the vortex axes are revealed.

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

Cited by 3 publications

References 1 publication

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

Phenomenology of Kármán vortex streets in oscillatory flow

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