# name
Experimental pinning-depinning mechanism of the contact line on patterned surfaces

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Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutora: Aurora Hernández-Machado

# metadata.dc.description.abstract[].value
We study the interface ﬂuid-air of water in a patterned surface of a microchannel with a step. Our aim is to analyze how the advancement of the front is aﬀected by local pinning-depinnig of the contact line between the ﬂuid and the patterned surface. Microchannels with diﬀerent patterns made of PDMS were fabricated in order to study the front behaviour. The interface moves forward due to a forced imbibition created by a water pressure on a reservoir at a known height. The ﬂuid front is characterized by a constant velocity regime along the microchannel. We have observed that the pinning-depinning mechanism generates a local avalanche of the front, as well as it is concluded that this phenomenon produces an increase of the ﬂuid velocity after the step. The front holds in a linear regime before and after the pattern. We also see that the avalanche eﬀect is more relevant at low pressures or low velocity conditions

# metadata.dc.title[].value
Experimental pinning-depinning mechanism of the contact line on patterned surfaces