Air entrainment by contact lines of a solid plate plunged into a viscous fluid.
نویسندگان
چکیده
The entrainment of air by advancing contact lines is studied by plunging a solid plate into a very viscous liquid. Above a threshold velocity, we observe the formation of an extended air film, typically 10 microns thick, which subsequently decays into air bubbles. Exploring a large range of viscous liquids, we find an unexpectedly weak dependence of entrainment speed on liquid viscosity, pointing towards a crucial role of the flow inside the air film. This induces a striking asymmetry between wetting and dewetting: while the breakup of the air film strongly resembles the dewetting of a liquid film, the wetting speeds are larger by orders of magnitude.
منابع مشابه
Theory of wetting-induced fluid entrainment by advancing contact lines on dry surfaces.
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عنوان ژورنال:
- Physical review letters
دوره 108 20 شماره
صفحات -
تاریخ انتشار 2012