In this chapter, we take into account the influence of a deformable free surface and, as a consequence, we revisit the mathematical formulation of the classical problem describing the Bénard instability of a horizontal layer of fluid, heated from below, and bounded by an upper deformable free surface. Because the deformation of the free surface, subject to a temperature-dependent surface tension, is taken into account in the full Bénard convection problem, heated from below, we have not specified this convection as being a ‘thermal convection’.
Indeed, in the full starting Bénard problem, heated from below, when we take into account the influence of a deformable free surface, subject to a temperature-dependent surface tension, the fluid being an expansible liquid, it is necessary to take into account, simultaneously, four main effects. Namely:
-
(a)
the conduction adverse temperature gradient (Bénard) effect in motionless steady-state conduction temperature
-
(b)
the temperature-dependent surface tension (Marangoni) effect
-
(c)
the heat flux across the upper, free surface (Biot) effect
-
(d)
the buoyancy (Archimedean—Boussinesq) effect arising from the volume (gravity) forces.
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(2009). The Bénard (1900, 1901) Convection Problem, Heated from below. In: Convection in Fluids. Fluid Mechanics and its Applications, vol 90. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2433-6_4
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