Actually the answer is YES. Ultrasonic flow sensors which depend on piezoelectric transducers have been used for decades in precision flow measurement of gases and liquids. The principle usually requires a pair of transducers and electronics that that (1) excites a sound pulse across the fluid flow stream, and (2) receives the pulse. Doppler or time of flight principles are then used in the electronic circuits or software signal processing to determine the fluid velocity. And if you know the cross sectional area you can get the flow rate. You can read a more detailed account of ultrasonic flow sensors here.
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