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Title: Performance Evaluation And Field Application Of Clamp-On Ultrasonic Cross-Correlation Flow Meter, Crossflowtm
Author: Yuri Gurevich, Armando Lopez, Vahid Askari, Vahid Safavi-Ardibili,David Zobin
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: The ultrasonic cross-correlation flow meter CROSSFLOWTM is a totally non-intrusive device, which has a demonstrated accuracy of better than 0.5% and has been used successfully for measuring flows at high temperatures in nuclear power plants. It remains the only ultrasonic flow meter based on the cross-correlation principle. Although cross-correlation flow measurement technology was first proposed over twenty years ago 1-2, it is still considered a less established and a less accurate method for measuring single phase flows than the more conventional transit time approach. The reluctance to accept advances made in the development of the cross-correlation meter is primarily due to the fact that the theory behind the meter operation involves understanding of the turbulence in fluid flow, unlike a more transparent transit-time approach. However, theoretical and experimental work carried out over the past several years resulted in the derivation of the meter equations and in their validation for various measurement conditions. In addition, because of large amount of data processing required only relatively recently advances in personal computer technology and in data acquisition hardware and software allowed production of a digital meter with real-time on-line data collection capabilities. The purpose of this paper is to summarize results of meter verification in different laboratories, to compare performance of the meter with typical transit time meters and to present example of a typical field application. The remainder of the paper is organized as follows. Section 2 summarizes the physical principles of the operation of the cross-correlation flow meter. Section 3 describes results of laboratory measurements that provide verification of the technology. Finally, Section 4 deals with field application of the CROSSFLOW.




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