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On the formation and propagation of hydrothermal waves in liquid layers with phase change

Lappa, Marcello (2018) On the formation and propagation of hydrothermal waves in liquid layers with phase change. Computers and Fluids, 172. pp. 741-760. ISSN 0045-7930

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    This paper reports on a numerical model expressly developed to inquire about the role of solidification in determining the properties of the emerging surface-tension-driven flow in typical models of oxide crystal growth. Following earlier efforts in the literature, we consider substances which have already enjoyed a widespread consideration for such a kind of studies, i.e. sodium nitrate (NaNO3, Pr=8) and succinonitrile (SCN, Pr=23). Specific numerical examples are expressly elaborated and presented to provide inputs for an increased understanding of the main cause-and-effect relationships driving fluid flow and determining its properties. It is shown that, by interfering with the hydrothermal mechanism, namely the preferred mode of instability of Marangoni flow over a wide range of substances and conditions, solidification contributes to the chaoticity of the system by increasing the complexity of the emerging patterns and enriching the spectral content of the flow.