A vortex flowmeter works on the principle that the Strouhal number of 02 is a constant over a wide range of flow rates GATE Aerospace Engineering Question 2012

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## A vortex flowmeter works on the principle that the Strouhal number of 0.2 is a constant over a wide range of flow rates GATE-Aerospace Engineering-Question-2012

A vortex flowmeter works on the principle that the Strouhal number of 0.2 is a constant over a wide range of flow rates. If the bluff-body diameter in the flowmeter is 20 mm and the piezo-electric transducer registers the vortex shedding frequency to be 10 Hz, then the velocity of the flow would be measured as

(A) 0.1 m/s (B) 1 m/s (C) 10 m/s (D) 100 m/s

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Answer : - (b) 1 m/s.
In dimensional analysis, the Strouhal number (St) is a dimensionless number describing oscillating flow mechanisms. The parameter is named after Vincenc Strouhal, a Czech physicist who experimented in 1878 with wires experiencing vortex shedding and singing in the wind.

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