WHICH PHYSICAL QUANTITY OF TURBULENT STRUCTURES IS MEASURED IN CROSS CORRELATION FLOWMETERS?

Volker Hans

Abstract

Measurements of flow velocity with cross correlation functions of ultrasonic signals show that the travelling time of structures determined by the peak of the functions deviates from the average flow velocity. This difference usually is explained by the difference between line integral of measurement and area integral of the average flow velocity.<BR /> A comparison of the frequency distribution of single velocity components in the fluid determined by particle image velocimetry with the cross correlation measuring method shows that the most frequent components in the fluid are in accordance with the travelling time of structures measured by cross correlation. The physical explanation can be given by means of the impulse response.

Keywords

flowmeters, cross correlation, ultrasound

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PWC-2003-TC9-002.pdf

DOI

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IMEKO TC

TC9 - Flow Measurement

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