The effect of the inlet diameter Din on the discharge coefficient Cd of critical-flow Venturi nozzle with a toroidal throat is investigated in the laminar boundary layer region. Din ranged from 5.00D to 1.73D, which were obtained by shaving the inlet of a high-precision nozzle that was originally complying with ISO 9300. Flat, freestanding lip, and frustum inlets were investigated.
Effect of Inlet Diameter on the Discharge Coefficients of Toroidal-Throat Critical-Flow Venturi Nozzles
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Ishibashi, M, & Morioka, T. "Effect of Inlet Diameter on the Discharge Coefficients of Toroidal-Throat Critical-Flow Venturi Nozzles." Proceedings of the ASME/JSME 2007 5th Joint Fluids Engineering Conference. Volume 2: Fora, Parts A and B. San Diego, California, USA. July 30–August 2, 2007. pp. 175-180. ASME. https://doi.org/10.1115/FEDSM2007-37638
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