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Bernoulli Principle
Flow restriction creates pressure drop proportional to flow square.
Primary Devices
Orifice plates, Venturi tubes, and Pitot tubes.
Orifice Plate
Venturi Tube
Flow Nozzl
Pitot Tube
DP Flowmeter Head Types Comparison
Orifice Plat
Sharp-edged concentric hole in pipe line
Venturi Tube
Gradual converging cone and diffuser section.
Flow Nozzle
Elliptical inlet throat restriction
Pitot Tube
Stagnation vs. static pressure tube probe.
Electromagnetic Flowmeters
Based on Faraday's Law of Induction.
Ultrasonic Flowmeters
Transit-time difference & Doppler shift.
Vortex Flowmeters
Von Kårmån vortex street generation across bluff body.
Thermal Mass Meters
Convective heat dissipation rate from heated sensor elements.
Coriolis Mass Meters
Inertial phase-shift deflection in vibrating flow tubes