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. 2019 Nov 8;19(22):4886. doi: 10.3390/s19224886

Figure 3.

Figure 3

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).