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.

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