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On the definition of a small orifice

Murthy, KK and Rao, NSL and Prasad, R (1975) On the definition of a small orifice. In: Acta Technica Academiae Scientiarum Hungaricae, 80 (3-4). 419 -426.

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Abstract

An attempt is made to draw a line of demarcation between small orifices and large orifices. It is proposed that an orifice can be considered 'small' if the discharge through it calculated on the small-orifice assumption differs from the exact discharge by less than half of one per cent. Using this criterion, it is shown that a circular or elliptic orifice can be deemed 'small' as long as the ratio of the depth of the orifice to the head causing the flow (measured from the center of the orifice to the liquid surface) is less than 0.8; a rectangular orifice can be deemed 'small' if the ratio is less than 0.7. A correction factor is suggested for the coefficient of discharge to account for the deviation from the exact discharge.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Akademiai Kiado.
Keywords: Discharge coefficient;liquid flow;nozzle design;nozzle geometry;orifice flow;circles (geometry);cross sections;ellipses;rectangles.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 15 Jan 2010 10:31
Last Modified: 15 Jan 2010 10:31
URI: http://eprints.iisc.ernet.in/id/eprint/23951

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