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Title: Liquid Measurement By Segmental Wedge
Author: Raymond E. Owen
Source: 1981 International School of Hydrocarbon Measurement
Year Published: 1981
Abstract: It has been well established that differential producing primary flow elements such as orifice plates, venturl tubes, and flow nozzles are highly limited when applied to flow measurement at low Reynolds numbers. These elements are restricted to turbulent flow where the Reynolds number is above 4000. If extended below 4000, these elements inherently will deviate from the basic square root relationship between flow and differential pressure. This deviation can be of considerable magnitude and, therefore, will have a significant effect on flow measurement accuracy.

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