Editing Flow measurement (section)

{{Short description|Quantification of bulk fluid movement}}
{{Use dmy dates|date=January 2022}}
'''Flow measurement''' is the quantification of bulk [[fluid]] movement.  Flow can be measured using devices called '''flowmeters''' in various ways. The common types of flowmeters with industrial applications are listed below:
* Obstruction type (differential pressure or variable area) 
* Inferential (turbine type)
* Electromagnetic
* [[Positive displacement meter|Positive-displacement flowmeters]], which accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow. 
* Fluid dynamic (vortex shedding)
* Anemometer
* [[Ultrasonic flow meter]]
* [[Mass flow meter]] ([[Coriolis force]]).

Flow measurement methods other than positive-displacement flowmeters rely on forces produced by the flowing stream as it overcomes a known constriction, to indirectly calculate flow. Flow may be measured by measuring the velocity of fluid over a known area. For very large flows, tracer methods may be used to deduce the flow rate from the change in concentration of a dye or radioisotope.