The mass flow rate of a system is a
measure of the mass of fluid passing a point in the ( ˙
m) system per unit time.
The mass flow rate is related to the volumetric flow rate as
shown in Equation 32
where r is the density of the
fluid.
If the volumetric flow rate is in cubic feet
per second and the density is in poundsmass per cubic
foot, Equation 32 results in
mass flow rate measured in poundsmass per second. Other
common units for measurement of
mass flow rate include kilograms per second and poundsmass
per hour. Replacing V in Equation 32 with the
appropriate terms from Equation 31 allows the direct
calculation of the mass flow rate.
Example:
The water in the pipe of the previous example
had a density of 62.44 lbm/ft3.
Calculate the mass flow
rate.
