Design and development of variable area orifice meter

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Date
2002
Authors
Sondh, H S
Singh, S N
Seshadri, V
Gandhi, B K
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Abstract
The variable area orifice meter indicates the flow rate as a linear displacement of a symmetrical body placed concentrically downstream of an orifice inside a constant area duct. Three shapes of symmetrical body namely, a frustum of cone, frustum of cone with hemispherical base, and frustum of cone with hemispherical base and parabolic apex are used downstream of an orifice to develop a variable area orifice meter. Experiments have been performed at different positions of the symmetrical bodies to evaluate the performance of the variable area orifice meter. The frustum of cone having hemispherical base and parabolic apex gives nearly linear variation of the flow rate with its position for a constant pressure differential.
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Keywords
orifice meter, symmetrical body, frustum of cone, hemispherical base, parabolic apex, constant pressure
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