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Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice
Author(s) -
Böhm Lutz,
Jankhah Sepideh,
Tihon Jaroslav,
Bérubé Pierre R.,
Kraume Matthias
Publication year - 2014
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400026
Subject(s) - mechanics , shear stress , flow (mathematics) , measure (data warehouse) , filtration (mathematics) , transient flow , transient (computer programming) , shear flow , computer science , materials science , mechanical engineering , engineering , mathematics , physics , electrical engineering , data mining , statistics , operating system , surge
The electrodiffusion method has been used in fluid dynamic research for the past 50 years. It allows the measurement of wall shear stress, a crucial parameter, e.g., for the cleaning of membrane modules used in water filtration. Various authors have published articles dealing with the theory behind this technique. But no paper collects all the knowledge assembled over five decades of application. Here, comprehensive summary of the theory of steady flow, unsteady flow, and transient voltage step experiments is given. Factors influencing the accuracy of the measurements are discussed. Furthermore, a new approach to calibrate the system from voltage step experiments is introduced, and practical issues related to its application in flow measurements are discussed for an exemplary signal response to a near‐wall flow.
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