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In‐Line Monitoring of Rheological Parameters with an Electromagnetic Flowmeter
Author(s) -
Trächtler Ansgar,
Mesch Franz
Publication year - 1998
Publication title -
particle and particle systems characterization
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.877
H-Index - 56
eISSN - 1521-4117
pISSN - 0934-0866
DOI - 10.1002/(sici)1521-4117(199802)15:1<30::aid-ppsc30>3.0.co;2-x
Subject(s) - flow measurement , magnetic flow meter , rheology , acoustics , flow (mathematics) , line (geometry) , pressure drop , mechanics , measuring principle , parametric statistics , newtonian fluid , signal (programming language) , materials science , physics , optics , computer science , mathematics , composite material , statistics , geometry , programming language
Tomographic signal processing has been added to a conventional electromagnetic flowmeter. The result is a new method for measuring rheological parameters of viscous, non‐Newtonian fluids. The practical realization requires only minor changes to existing instruments. Hence their main advantages are maintained, such as non‐invasive, in‐line measurement without pressure drop. The basic idea is to generate two different magnetic fields with the flowmeter by switching the current direction in one of the magnetic coils. The flowmeter measures two signals depending on the flow profile. Using simple parametric models for both the flow profile and the rheology, the flow profile can be calculated from the flowmeter signals, and from the flow profile the rheological behaviour is determined. The theory and experimental results with a slightly modified industrial flowmeter are presented.