Which type of flow sensor uses a bluff body placed in the fluid flow to produce whirlpools or eddies?

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Multiple Choice

Which type of flow sensor uses a bluff body placed in the fluid flow to produce whirlpools or eddies?

Explanation:
This question is about vortex shedding flow sensors. When a bluff body sits in a fluid stream, the flow separates alternately on each side, creating a pattern of whirlpools downstream called a vortex street. A sensor downstream detects the resulting pressure fluctuations or impacts, and the frequency of these vortices is tied to the flow velocity (f ≈ St × U / D, with St the Strouhal number and D the bluff-body size). This lets the meter determine flow rate without moving parts. The other types don’t rely on vortex shedding: ultrasonic meters use sound waves to measure flow, turbine meters use a spinning rotor driven by the flow, and Coriolis meters measure mass flow via the twisting of tubes.

This question is about vortex shedding flow sensors. When a bluff body sits in a fluid stream, the flow separates alternately on each side, creating a pattern of whirlpools downstream called a vortex street. A sensor downstream detects the resulting pressure fluctuations or impacts, and the frequency of these vortices is tied to the flow velocity (f ≈ St × U / D, with St the Strouhal number and D the bluff-body size). This lets the meter determine flow rate without moving parts. The other types don’t rely on vortex shedding: ultrasonic meters use sound waves to measure flow, turbine meters use a spinning rotor driven by the flow, and Coriolis meters measure mass flow via the twisting of tubes.

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