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. 2019 Feb 22;10:2041731419827922. doi: 10.1177/2041731419827922

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© The Author(s) 2019

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 License (http://www.creativecommons.org/licenses/by-nc/4.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 4. — (a) A 3D graphical representation of the shear stresses, exemplified on the sides of a box, which are used to calculate the wall shear stress (equations (7) and (8)); (b) an example of an idealised perfectly circular pore, which is used to calculate the velocity inside the pore and subsequently the wall shear stress exerted on the pore walls (equations (9)–(11)).