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- W2063141572 abstract "Trains of sound waves of a definite frequency, emitted by sound sources which are separated by a known distance, are sent up and down a pipe in which flows a stream of fluid whose velocity is required. Anti-nodes formed in the region between the sound sources undergo a shift the magnitude of which depends upon the velocity of the fluid. By using interrupted wave trains the effects of reflections at the ends of the pipe are eliminated. The meaning of the velocity measured by this method is considered when the flow of the fluid is turbulent. Experiments on air flow show that the antinodes are sharply defined, stationary with time, and occur on planes normal to the axis of the pipe. It is concluded that the average velocity as calculated from the sound shift method differs by a negligibly small amount from the average velocity obtained by dividing the total flow per second past a section, by the area of the section. A smoke cloud introduced into the air stream and timed over a known distance yields results which are compared with those obtained from the sound shift method." @default.
- W2063141572 created "2016-06-24" @default.
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- W2063141572 date "1927-03-01" @default.
- W2063141572 modified "2023-09-27" @default.
- W2063141572 title "An Absolute Method for Measuring The Velocity of Fluids" @default.
- W2063141572 doi "https://doi.org/10.1103/physrev.29.485" @default.
- W2063141572 hasPublicationYear "1927" @default.
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