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RESEARCH PAPERS

Flow and Temperature Profile Independence of Flow Measurements Using Long Acoustic Waves

[+] Author and Article Information
Baldwin Robertson

Chemical Process Metrology Division, Center for Chemical Engineering, National Bureau of Standards, Washington, D.C. 20234

J. Fluids Eng 106(1), 18-20 (Mar 01, 1984) (3 pages) doi:10.1115/1.3242392 History: Received March 22, 1983; Online October 26, 2009

Abstract

An expansion in powers of V /c is derived for the wave number of the fundamental sound mode in a flow conduit, where V is the velocity of fluid in the conduit and c is the local sound speed. Both V and c are assumed to be independent of the longitudinal coordinates and of the time, but may have arbitrary profiles. The calculation applies to frequencies well below the cutoff frequency of the conduit, which may have an arbitrary cross-sectional shape. To lowest order, the wave number depends only on the average of the longitudinal component of V and is independent of its profile.

Copyright © 1984 by ASME
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