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A revisit of the electro-diffusional theory for the wall shear stress measurement.
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SYSNO ASEP 0534262 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A revisit of the electro-diffusional theory for the wall shear stress measurement. Author(s) Havlica, Jaromír (UCHP-M) RID, ORCID, SAI
Kramoliš, D. (CZ)
Huchet, F. (FR)Article number 120610 Source Title International Journal of Heat and Mass Transfer. - : Elsevier - ISSN 0017-9310
Roč. 165, Feb 2021 (2021)Number of pages 10 s. Language eng - English Country US - United States Keywords boundary layer ; electrochemical method ; mass transfer Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering Method of publishing Limited access Institutional support UCHP-M - RVO:67985858 UT WOS 000596069900009 EID SCOPUS 85095706744 DOI 10.1016/j.ijheatmasstransfer.2020.120610 Annotation This article intends to revisit the electro-diffusional theory for the wall shear stress measurement from mass transfer probes of rectangular shape by considering the existence of two components of the wall shear rate (i.e., axial and transversal). General analytical formulas for the effective transf er length and the dimensionless mass transport coefficient were derived as a function of two parameters: a dimensionless angle of the flow direction, relative to the leading edge of the probe, and the aspect ratio between the width and the length of the strip probe. The correctness of the analytical relations for arbitrary flow direction and the aspect ratio was confirmed by numerical solutions of the transport equation in the convective-diffusive regime. It has also been proved that the differences between the Lévêque solution and the general analytical formula exhibit a significant deviation for a specific range of parameters. In the case of the three-dimensional boundary layers, in addition to the magnitude of the wall shear stress, the direction of the fluid flow in the vicinity of the probe’s surface is of paramount importance. Accordingly, a measurement methodology is proposed using two strip probes with different aspect ratios. The resulting equations required to quantify the magnitude of the wall shear rate vector and the dimensionless angle are also derived. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0313721
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