Scale Effects in Swirling Flow

by John A. McCorquodale,

Serial Information: Journal of the Hydraulics Division, 1968, Vol. 94, Issue 1, Pg. 285-302

Document Type: Journal Paper

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Abstract: This paper presents the results of a study of vortex behavior in open-channel hydraulic models. The effects of model scale on steady well-developed vortices were investigated experimentally by comparing the behavior of three sizes of geometrically similar models. The models had sharp-edged circular orifices with diameters of 2 in., 4 in., and 6 in., respectively. Similarity of swirl production, discharges and air cores was considered. A general dissimilarity was found between the swirls produced in the smallest model and those in the two larger models. Also a local scale effect was detected in the region of the air core; the swirl reduction in this region was greatest in the smallest model. A theoretical explanation is given for the local scale effect. The behavior of the two larger models was similar.

Subject Headings: Hydraulic models | Scale models | Scale effect | Model analysis | Vortices | Open channels | Geometrics |

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