Notes
We use G slightly differently from the one used by PC where our G, although still represents the magnitude of the pressure gradient, contains a dimensionless geometric factor. The purpose of this is to simplify the notation and to be more general by accommodating different geometries.
References
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Sochi, T. Reply to “Comment on Sochi’s variational method for generalised Newtonian flow” by Pritchard and Corson. Rheol Acta 54, 661–665 (2015). https://doi.org/10.1007/s00397-015-0859-6
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DOI: https://doi.org/10.1007/s00397-015-0859-6