A movable L tube flow meter enables us to obtain
ρQ2 where
ρ is the density of fluid and
Q is its volume flow rate.
As the density of a gas however, is very sensitive to temperature and pressure, density measured at one location is not in general applicable to any other.
Therefore, to obtain the mass flow rate of a gaseous substanceby a movable L tube flow meter, it is necessary to know the density at the inlet (or the outlet) end of the tube.
For this purpose the density, temperature and pressure at an appropriate position in a flow line and, in addition, the temperature and pressure at inlet (or outlet) section are measured.
By this method, it is experimentally shown that the mass flow rate of air as measured is approximately in agreement with theory.
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