Controlling the breakup of toroidal liquid films on solid surfaces.

ABSTRACT: The breakup of a slender filament of liquid driven by surface tension is a classical fluid dynamics stability problem that is important in many situations where fine droplets are required. When the filament is resting on a flat solid surface which imposes wetting conditions the subtle interplay with the fluid dynamics makes the instability pathways and mode selection difficult to predict. Here, we show how controlling the static and dynamic wetting of a surface can lead to repeatable switching between a toroidal film of an electrically insulating liquid and patterns of droplets of well-defined dimensions confined to a ring geometry. Mode selection between instability pathways to these different final states is achieved by dielectrophoresis forces selectively polarising the dipoles at the s

SUBMITTER: Edwards AMJ 

PROVIDER: S-EPMC8046813 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature