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 ?
Leakage Rates (cfm) for Different Supply Pressures and Approximately Equivalent Orifice Size Orifice Diameter (inches) Pressure 1/64 1/32 1/16 1/8 1/4 3/8 (psig) 70 0.29 1.16 4.66 18.62 74.4 167.8 80 0.32 1.26 5.24 20.76 83.1 187.2 90 0.36 1.46 5.72 23.10 92.0 206.6 100 0.40 1.55 6.31 25.22 100.9 227.0 125 0.48 1.94 7.66 30.65 122.2 275.5
Table 1 Parameters of the pump Names of parameters Value spool diameter, mm 10 rod diameter, mm 5 mass, kg 0.02 higher displacement limit, mm 0.01 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 1.3 right equivalent orifice diameter, mm 0.5 Table 2 Parameters of the directional valve Name Value spring force at zero 20 displacement, N spring stiffness, N/mm 10 volume of chamber, [cm.sup.3] 10 piston diameter, mm 10 rod diameter, mm 5 mass, kg 0.03 coefficient of viscous 1000 friction, N/(m/s)
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.
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