equivalent orifice

equivalent orifice

[i′kwiv·ə·lənt ′ȯr·ə·fəs]
(mechanical engineering)
An expression of fan performance as the theoretical sharp-edge orifice area which would offer the same resistance to flow as the system resistance itself.
References in periodicals archive ?
01 left spring stiffness, N/mm 600 spring force at zero displacement, N 30 coefficient of viscous friction, N/(m/s) 1000 right spring rate, N/m 300000 piston diameter, mm 10 rod diameter, mm 3 left equivalent orifice diameter, mm 1.
Vortex meters for example, can produce a pressure drop of anywhere between low tens to low hundreds of millibars for a similar measurement system, while the pressure drop across an equivalent orifice plate can be even higher.
If this hydraulic force were unopposed, the element would shift to wide open position and fluid would flow through the control valve with very low pressure drop -- just the equivalent orifice drop across the valve flow path.
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