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Article Dans Une Revue International Journal of Thermal Sciences Année : 2019

Overhanging shapes of freezing sessile drops under continuous liquid supply

Rémy Herbaut
Philippe Brunet
Laurent Limat

Résumé

To predict the shape of solidifying material onto a substrate is currently motivating an increasing number of studies related to additive manufacturing. Here we consider the solidification of a liquid drop on a cold substrate, below the freezing temperature, under continuous feeding at a constant flow-rate through a thin needle placed above. We compare experimental shapes to those predicted by a theoretical model where heat transfer is mainly due to conduction within the solid and when the inner flow is neglected. Hence, this is an analogous of Stefan problem for a sessile drop, with additional feeding of liquid. We show that, depending on the control parameters, namely the initial angle, substrate temperature and flow-rate, different shapes are observed, in particular original overhanging ones. We provide a simple model, which is in very good agreement with experiments. We then discuss on the limitations of the model.
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Dates et versions

hal-02343315 , version 1 (02-11-2019)

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Rémy Herbaut, Philippe Brunet, Laurent Royon, Laurent Limat. Overhanging shapes of freezing sessile drops under continuous liquid supply. International Journal of Thermal Sciences, 2019, 140, pp.135-143. ⟨10.1016/j.ijthermalsci.2019.02.043⟩. ⟨hal-02343315⟩
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