Measurement of Minor Flow Rates by Specially Designed Small Notch Flow Meter

Abstract

A small notch meter was specially designed for measurement of minor flow rates and was put into experimental use. As the result of this experimental use, the flow meter was found to have a comparatively high accuracy in the measurement of such an extremely minor flow rate as 200 kg/hr. The equation of the flow meter is as follows:
W=2/3·√2g·ρ·B (1.349B+0.084) ·h (^{-2.680B+2.493}) 0.05<B<0.25 (cm) 0.0<h<10.0 (cm)
B is width of the notch, cm;
g is acceleration of gravity, cm/sec²;
h is height of liquid of the notch, cm;
W is flow rate, g/sec.
This flow meter proved to be usable for measuring dynamic hold up of a vacuum packing tower