The 'vortex flow meter' used in industries measures flow by:
Choose the correct answer
Differential pressure (like venturimeter)
Frequency of vortex shedding from a bluff body — proportional to velocity (von Kármán vortex street)
Float position (like rotameter)
Electromagnetic effect of conducting fluid
Correct Answer
B. Frequency of vortex shedding from a bluff body — proportional to velocity (von Kármán vortex street)
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Vortex flowmeter: a bluff body (Shedder bar) placed in flow; vortices shed alternately on each side (von Kármán vortex street) at a frequency f proportional to velocity: f = St × V/D (St = Strouhal number ≈ 0.2). Q = K × f (K = meter factor). No moving parts; works for gas and liquid. Not suitable for very low Re (Re < 10,000) or dirty/viscous fluids.
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