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Published on: August 18, 2018
Drop volume effect on the advancing macroscopic contact angle
Roudy Issa1, Houssine Benabdelhalim2, Marc Medale2
1Aix-Marseille University, CNRS, IUSTI, Marseille, France. roudy.issa@univ-amu.fr.
None:
We investigate the influence of drop volume on partial wetting of sessile drops on a horizontal solid substrate for up to large Bond numbers, considering water on both polymethyl methacrylate (PMMA) and aluminum-coated substrates, as well as glycerol on PMMA. The horizontal orientation of the substrate, along with methods for creating sessile drops, facilitated the rotational symmetry of drops to perform controlled and reproducible experiments. In particular, we explore the manner in which the statistic macroscopic contact angle (MCA) depends on the sessile drop volume or related Bond numbers, whether the drop is injected via a syringe positioned above the substrate (DSA30 Krüss equipment) or from below the substrate through a tiny hole drilled in it. In both cases, experimental results exhibit that as the drop volume is increased spanning Bond numbers in the range [0.1-14], the contact line advances on the substrate and the MCA significantly decreases down to an asymptotic value.
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