Chapter-15 | Basics of Flow Measurement

Flow measurement is essential in industries such as oil, power, chemical, food, water, and waste-treatment industries.

The flow quantity is determined by volume-flow rate, mass-flow rate or flow velocity.

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Some important flow meters are

Orifice plate

The Orifice plate is a device used for measuring flow rate. It also used for reducing pressure.

It uses Bernoulli’s Principle which states that “there is a relationship between the pressure of the fluid and the velocity of the fluid. When the velocity increases, the pressure decreases, and vice versa.”

orifice flow meter

Venturi Tube

The simplest apparatus is a tubular setup known as a Venturi tube or simply a venturi.

venturi flow
By user:ComputerGeezer and Geof – Modified from :de:Bild:Venturirohr.jpg, CC BY-SA 3.0,

Pitot tube

Pitot tube or Pitot probe is used to measure fluid flow velocity.

pitot tube

Ultrasonic flow meter

There are two types of ultrasonic flow meters, doppler ultrasonic flowmeter, and transit-time ultrasonic flow meter.

ultrasonic flow meter
By No machine-readable author provided. Moraviaspy assumed (based on copyright claims). – No machine-readable source provided. Own work assumed (based on copyright claims)., Public Domain,

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2 thoughts on “Chapter-15 | Basics of Flow Measurement

  1. 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.

    1. Thanks for!

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