Flow flow measuring devices pdf is the quantification of bulk fluid movement. Flow can be measured in a variety of ways.
Positive-displacement flow meters accumulate a fixed volume of fluid and then count the number of times the volume is filled to measure flow. Other flow measurement methods 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. Both gas and liquid flow can be measured in volumetric or mass flow rates, such as liters per second or kilograms per second, respectively.