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Principles of Technology
Waxahachie High School

Rate
in
Fluid Systems
PIC Chapter 3.2

PT TEKS


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Rate in Fluid Systems
Objectives:
 Define

volume flow rate
 Solve problems using the volume flow rate equation
 Define mass flow rate
 Solve problems using the mass flow rate equation
 Explain how volume and mass flow rates can be measured


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Rate in Fluid Systems

Rates in fluid systems describe the motion
of liquids and gases.
Fluids in motion have speed and
acceleration; however we use two different
rates to describe how quickly fluids flow:
volume flow rate and mass flow rate.


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Rate in Fluid Systems


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Rate in Fluid Systems


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Rate in Fluid Systems


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Rate in Fluid Systems


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Rate in Fluid Systems

Methods for measuring volume and mass
flow rates vary, depending on the situation.
The simplest, most direct method to find
average flow rate is to collect fluid and
measure the amount of fluid collected over
time.


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Rate in Fluid Systems

Flowmeters measure the average flow rate
of fluids by measuring pressure and velocity
and calculating the flow rate.
Flowmeters use indirect methods to
measure flow rates so that they do not
interrupt the flow.


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Rate in Fluid Systems

Volume flow rate equation using speed =
area x speed
Mass flow rate equation using speed =
density x area x speed
To find cross sectional area of a pipe use
this equation = pi x r2


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Rate in Fluid Systems


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Rate in Fluid Systems