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Title: Discharge Coefficient Of Super Accurate Critical Nozzle At Pressurized Condition
Author: Masahiro Ishibashi, Masaki Takamoto
Source: 1999 International Symposium on Fluid Flow Measurement
Year Published: 1999
Abstract: Critical Venturi nozzles of ten pieces essentially complying with 1S09300 whose machining errors were less than lpm were calibrated by a constant volume tank system using air at absolute pressure of 0.1-O.5MPa with the Reynolds number of 5X104-1.2X10G. All the measured discharge coefficients were distributed along a fitted curve, which had been obtained from calibrations of other 23 critical nozzles with negligible machining error performed at atmospheric pressure and lower with Reynolds number up to 2.4x105, with scattering of 0.l?ZO. The curve agrees with 1S09300 with the uncertainty of the 1S0, but it has a steeper gradient and significant deviation from the 1S0. One of the nozzles indicated a boundary layer transition at the Reynolds number around 106 as abrupt decrease of the discharge coefficient by 0.0570. In view of the fact that the 1S0 is rather suitable for larger Reynolds number up to 107 with turbulent boundary layer, the fitted curve is considered to be better to be employed at low Reynolds number below 106 where the laminar boundary layer is expected.

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