Abstract
The vast majority of theoretical and numerical studies of buoyancy-thermocapillary convection use one-sided models [9, 19–22] that only consider the convection in the liquid phase, while ignoring transport through the gas phase and the phase change across the liquid-gas interface. The heat and mass transport in the gas phase are incorporated indirectly through boundary conditions at the liquid-gas interface, and the interface is assumed to be rigid (and, in most of the cases, flat). Such an approach might be justifiable for nonvolatile liquids, since air is a relatively poor conductor of heat, and for the volatile liquids at ambient (atmospheric) conditions when phase change is strongly suppressed. Indeed, the predictions of such models are for the most part consistent with experimental studies of volatile and nonvolatile fluids at ambient (atmospheric) conditions [1, 9–12]. However, for volatile liquids at reduced air pressure, phase change can lead to significant heat fluxes in the liquid layer due to the latent heat released or absorbed at the interface, and the interfacial mass flux (which defines the latent heat flux) cannot be computed reliably without a proper model of bulk mass transport in the gas phase. Therefore a two-sided model is required, where the heat and mass transport in both phases are modeled explicitly. Two-sided models have been formulated previously [49, 50, 82, 87–91]. These models, however, assume rather than compute the shape of the liquid-gas interface, employ extremely restrictive assumptions and/or use a very crude description of one of the two phases.
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Qin, T. (2017). Mathematical Model. In: Buoyancy-Thermocapillary Convection of Volatile Fluids in Confined and Sealed Geometries. Springer Theses. Springer, Cham. https://doi.org/10.1007/978-3-319-61331-4_2
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