Experimental Study of Vortices behind a Body : 1st Report, Circular Cylinders

直三, 服部; 桂三, 八田; 進, 小竹

doi:10.1299/kikai1938.39.665

Cited by 3 publications

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“…At higher Reynolds numbers, turbulence appears in the separated shear layers and some irregularity of the velocity fluctuations is developed although there is still a predominant frequency near the cylinder. However, the results of Hattori et al (1973) suggest that the transition range corresponds approximately to 80 < Re < 200. Although the scatter of the present data did not permit to exactly estimate the transition range, its lower limit seems to be Re = 90-100. figure 4.…”

Section: Strouhal Numbermentioning

confidence: 91%

Vortex shedding from a circular cylinder in moderate-Reynolds-number shear flow

1980

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The frequency of vortex shedding from a circular cylinder in a uniform shear flow and the flow patterns around it were experimentally investigated. The Reynolds number Re, which was defined in terms of the cylinder diameter and the approaching velocity at its centre, ranged from 35 to 1500. The shear parameter, which is the transverse velocity gradient of the shear flow non-dimensionalized by the above two quantities, was varied from 0 to 0·25. The critical Reynolds number beyond which vortex shedding from the cylinder occurred was found to be higher than that for a uniform stream and increased approximately linearly with increasing shear parameter when it was larger than about 0·06. In the Reynolds-number range 43 < Re < 220, the vortex shedding disappeared for sufficiently large shear parameters. Moreover, in the Reynolds-number range 100 < Re < 1000, the Strouhal number increased as the shear parameter increased beyond about 0·1.

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Section: Strouhal Numbermentioning

confidence: 91%

Vortex shedding from a circular cylinder in moderate-Reynolds-number shear flow

1980

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Flow around Turbulence Promoters in Parallel Channel, (I)

Shiina

Takizuka

Okamoto

1982

Journal of Nuclear Science and Technology

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Flow around Turbulence Promoters in Parallel Channel, (II)

Shiina

1983

Journal of Nuclear Science and Technology

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Effects of walls on shedding vortex in developed channel flow were investigated putting a cylinder a t the center of channels or on a wall for the value of wld from 2 to 4. Results were compared with the uniform flow result.When a cylinder was put at the center of the channels, non-dimensional frequency plotted against Reynolds number agreed with the uniform flow result a t low Reynolds number. However, i t increased rapidly with Reynolds number, then it lay considerably above the uniform flow results a t high Reynolds number. When a cylinder was put on a wall, nondimensional frequency was considerably lower than the uniform flow result in the cases Of wld=3 and 4. In the case of w J d = 2 , however, frequency was higher than the uniform flow result a t high Reynolds number. In all cases in the present study, the transition Reynolds number increased with decrease in the value of wld.These results indicate that the increase in shedding frequency was due to the shift in velocity distribution from Poiseuille parabora in the wake region, which obviously increased with Reynolds number and with decrease in channel width.

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Experimental Study of Vortices behind a Body : 1st Report, Circular Cylinders

Cited by 3 publications

References 0 publications

Vortex shedding from a circular cylinder in moderate-Reynolds-number shear flow

Vortex shedding from a circular cylinder in moderate-Reynolds-number shear flow

Flow around Turbulence Promoters in Parallel Channel, (I)

Flow around Turbulence Promoters in Parallel Channel, (II)

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