Influence of liquid miscibility and wettability on the structures produced by drop–jet collisions

Miscibility and wettability: how interfacial tension influences droplet impact onto thin wall films

“…This is confirmed by the estimation of S for GW/Hexa which is negative with approximately , and the observation of n-hexadecane lenses on top of GW (Baumgartner et al. 2020). In contrast, silicone oil (abbreviation S.O., fourth column in table 1) provides full wetting with aqueous solutions (Ross & Becher 1992; De Gennes et al.…”

“…A trend between the liquid pairs is observed, similar to the maximum crown surface Σ c,max : the ascending phase of GW/Hexa is slightly shorter than that of GW/SO, which is (not systematically) slightly smaller than GW/EtOH. These durations are slightly increasing with growing We d , as already observed for example with droplet impacts onto dry surfaces (Huang & Chen 2018), but not for droplet head-on collisions or impacts onto a continuous jet, where the kinetics is fixed by the encapsulated drop only (Baumgartner et al 2020).…”

“…The full wetting behaviour is confirmed by the observation of an oil drop spreading on the surface of a liquid bath of GW (Baumgartner et al. 2020).…”

“…The droplet liquid is systematically composed of a mixture of glycerol and water (abbreviation GW), which is coloured with Indigotin 85 (E 132, BASF, Germany) similar to the liquids used by Baumgartner et al. (2020). The only parameter varying significantly is the interfacial tension with the wall-film liquids (see Baumgartner et al.…”

“…The only parameter varying significantly is the interfacial tension with the wall-film liquids (see Baumgartner et al. (2020) for more details on their determination), the subscript standing for droplet and for wall film. The interfacial tension is associated with the miscibility behaviour ( for miscible liquids) and the wettability behaviour through the spreading parameter .…”