coefficient d'écoulement

CONT: Interchangeable restrictors control the flow of liquid from the reservoir by gravity to the disc. ... A part from the size of the restrictor, flow rate is also affected by viscosity of the formulation, which may change with the temperature. Flow rate should be checked, prior to spraying and during spraying if there is a marked change in temperature, by timing the period to spray a known quantity of liquid, preferably with the discs rotating. ...