Application of the Electrodiffusion Method to Measure Wall Shear Stress: Integrating Theory and Practice |
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| Authors: | Lutz Böhm Sepideh Jankhah Jaroslav Tihon Pierre R. Bérubé Matthias Kraume |
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| Affiliation: | 1. Chair of Chemical and Process Engineering, Technische Universit?t Berlin, Berlin, Germany.;2. Department of Civil Engineering, The University of British Columbia, Vancouver, BC, Canada.;3. Institute of Chemical Process Fundamentals, ASCR, Praha, Czech Republic. |
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| Abstract: | 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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| Keywords: | Calibration Electrochemical methods Electrodiffusion method Fluid dynamics Frequency response Shear stress |
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