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Theses

Dynamique des liquides sur substrat froid, avec solidification.

Abstract : We study the liquids spreading on cold substrate, with solidification. The intended application is the aeronautical sector, which faces icing problems when the aircraft is on the ground. The deicing is currently carried out by an ethylene glycol jet, which contributes to an additional cost for the companies and a significant pollution. Our objectives focus on fundamental issues of spreading a drop on a substrate at a temperature below the solidification temperature. On a given surface, is it possible to predict whether the drop solidifies or spreads as soon as it is impacted ? What are the forms taken by it, before, during and after solidification? What is the solidification mechanism and its influence on the spreading dynamics? What are the parameters that control the dynamics of the processes involved ? Several devices and models will be implemented to provide some answers to these questions. Our goals also include strategies to avoid freezing drops and allowing them to slide before freezing. Oscillation of a droplet or grafting of polymer to modify the surface condition will also be considered. This thesis attempts to bring some new elements of understanding by focusing on two very different types of flows. First, the advance of a line of contact in the presence of solidification. Second, the growth of a solid drop under continuous liquid feed.
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Rémy Herbaut. Dynamique des liquides sur substrat froid, avec solidification.. Physique [physics]. Université Sorbonne Paris Cité, 2019. Français. ⟨NNT : 2019USPCC006⟩. ⟨tel-02491745⟩

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