Impact et étalement de micro-gouttes sur des substrats solides

In this article, various hydrodynamic phenomena associated with ink jet printing process are investigated. This study is limited to the impact and initial spreading phases, the capillary wicking into porous media which is paramount in defining the print quality will be considered elsewhere. The experimental methods used are based on high-speed cinematography and phase controlled ultra short snapshots of the impact process, which allow to measure accurately the transient diameters and heights of the micro-drops on extremely small spatial and time scales. Drop dynamics modeling is performed by solving a variational problem for a given drop geometry. This allows to obtain the drop profiles during the very short inertial impact, spreading and eventual coalescence phases. We then present the transient evolution of the apparent contact angles on substrates with different wetting behavior and discuss the short and long time spreading behavior of micro-drops. We finally show that the proposed model while agreeing fairly well with experiments is able to predict the influence of the interactions between the fluid and the substrate.

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