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. 2016 Mar 15;6:22257. doi: 10.1038/srep22257

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Panels (a,b) show the velocity profile in the whole channel (insets) and in the region close to the brush (main panels). In both cases, corresponding to (a) Wi = 45 and (b) Wi = 418, the profile is parabolic around v_max. In (a) no backflow is registered, while in (b) the flow inversion at z ~ h is evident. Panel (c) reports the minimum value v_min of the v_x(z) profile for different Wi (symbols). The line is a guide for the eye. It is possible to recognize three regions for which v_min assumes a negative value, signalling the presence of a backward flow.