NDLI: Ultrasound Gas Flow Measurement

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hans, Volker
Copyright Year	2003
Abstract	Measurements of flow velocity with cross correlation functions of ultrasonic signals show that the travelling time of structures deviates from the mean flow velocity. This difference usually is explained by the difference between the line integral of measurement and the area integral of the mean flow velocity. A comparison of the probability distribution of velocity components shows that the most frequent components in the fluid are in accordance with the travelling time of structures. The explanation is given by systems theory. In vortex shedding flow meters an ultrasonic wave is modulated by vortices behind a bluff body. The frequency of the vortices is proportional to the flow velocity. It depends on the size and arrangement of bluff bodies. As ultrasound is very sensitive to all kinds of modulating effects the size of bluff bodies can be drastically reduced in comparison to measurements with pressure sensors. Additionally the sensitivity can be increased, pressure losses behind the bluff body are considerably decreasing.
Sponsorship	Fluids Engineering Division
Starting Page	31
Ending Page	35
Page Count	5
File Format	PDF
ISBN	0791836975
DOI	10.1115/FEDSM2003-45591
e-ISBN	0791836738
Volume Number	Volume 2: Symposia, Parts A, B, and C
Conference Proceedings	ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
Language	English
Publisher Date	2003-07-06
Publisher Place	Honolulu, Hawaii, USA
Access Restriction	Subscribed
Subject Keyword	Pressure sensors Vortex shedding Ultrasonic waves Systems theory Flow (dynamics) Pressure Fluids Gas flow Vortices Statistical distributions Flowmeters Signals Ultrasound
Content Type	Text
Resource Type	Article

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