Which type of flow meter uses the principle of Bernoulli’s equation?
Options:
A. Rotameter
B. Orifice Meter
C. Electromagnetic Flow Meter
D. Ultrasonic Flow Meter
View Answer
B. Orifice Meter
Explanation:
An Orifice Meter works on the principle of Bernoulli’s equation. When fluid passes through the restriction (orifice plate), its velocity increases and pressure decreases. The pressure difference created across the orifice is measured and used to calculate the flow rate.
According to Bernoulli’s principle:
- Increase in fluid velocity causes a decrease in pressure.
- Differential pressure generated across the orifice is proportional to flow.
Why other options are incorrect:
- Rotameter → Works on variable area principle.
- Electromagnetic Flow Meter → Works on Faraday’s law of electromagnetic induction.
- Ultrasonic Flow Meter → Works using ultrasonic wave transit time or Doppler effect.
Orifice meters are widely used in process industries because of their simple construction, low cost, and compatibility with differential pressure transmitters.