Measuring Water Velocity by Ultrasonic Flowmeter

by Jack C. Schuster, Hydr. Engr.; Hydr. Branch, Div. of General Research, Engrg. and Research Center, Bureau of Reclamation, Denver, Colo.,

Serial Information: Journal of the Hydraulics Division, 1975, Vol. 101, Issue 12, Pg. 1503-1517

Document Type: Journal Paper


A limited study of a sing-around ultrasonic flowmeter was made in a 2.5-ft (0.76-m) square laboratory channel. Traversing the flow vertically with the meter transducers produced a satisfactory velocity profile. Integration of the profile by manual methods showed an average deviation of -3.4% compared to the bulk flow velocity Q/A measured by a venturi meter in a symmetrical profile for flows ranging from 3 cfs-11.4 cfs (0.08 m³/s 0.32 m³/s). Deviations of +l4% to -6% were found in an unsymmetrical flow caused by a thin vertical plate having a width l0% of the channel width. General operation of the meter was satisfactory, and the sing-around principle appears satisfactory for discharge measurement.

Subject Headings: Flow profiles | Flow measurement | Fluid velocity | Ultrasonic methods | Laboratory tests | Velocity profile | Fluid flow | Pipe flow

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