### Mass Flow Rate Fluids Flow Equation

**Fluid Flow Table of Contents**

Hydraulic and Pneumatic Knowledge

*
Mass Flow Rate Fluids Flow Equation *

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 3-2
where r is the density of the
fluid.

If the volumetric flow rate is in cubic feet per second and the density is in pounds-mass per cubic foot, Equation 3-2 results in mass flow rate measured in pounds-mass per second. Other common units for measurement of mass flow rate include kilograms per second and pounds-mass per hour.

Replacing V in Equation 3-2 with the appropriate terms from Equation 3-1 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/ft^{3}.
Calculate the mass flow
rate.