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Flow rate can be expressed as
mass or volumetric flow rate
Mass flow rate
mass of material flowing per unit of time
Mass flow rate used to measure
flow rate of solids
Volumetric flow rate
volume of material flowing per unit of time
Volumetric flow rate used to measure
flow rate of liquids and gases
Standard conditions
14.7 psi 15.5 C, 36% relative humidity
2 types of variable-area flow meters
rotameters and piston-type
Variable area flow meters provide a
direct visual reading of the flow rate
Variable-area flow meters increase the size of their _ as flow rate increases
orifice
Variable-area flow meters reading varies directly with the size of
their orifice
Differential-pressure flow meters include
orifice plates venturi tubes pitot tubes elbow taps
What happens to fluid pressure when velocity is increased
it decreases
Differential pressure sensors are _ flow sensing elements
primary
The flow rate when using a differential-pressure flow meter is inferred from an induced
pressure drop
Rotary-element flow meters include
propeller and paddle wheel flow meters
The rotating part of rotary-element flow meters are the
primary sensing element
Rotary element flow meteres comine
a rotating part and a conditioning circuit
The _ of a rotary element sensor is placed directly in the flow stream
rotating part
As the rotary part turns, it interrupts
a beam of light or magnetic field
When the rotary part of a rotary-element interrupts the beam of light it produces a
pulsed signal
The pulsed signal produced by a rotary flow meter is proportional to
the flow rate
Non disruptive flow meters include
magnetic flow meters, ultrasonic flow meters, Coriolis meter
Note
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