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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Experimental set up and measurements: (a) Schematic representation of the experimental set up, (b) MPWM principle, (c) The measurement performed by taking into account the advancement of the liquid boundary with the length (L) (the cross-sectional area of the channel is constant).