ABSTRACT
Vibrating a fluid corresponds to submitting it to a periodic acceleration. A vibration can be decomposed into its Fourier harmonic components. External accelerations thus act on density gradients and can couple with other gravity-induced flows. Local fluid velocity depends on the local density by inertial effect. The thermovibrational flows can annihilate thermogravitational flow such as buoyancy and/or thermocapillary convection when an interface is present, depending on the mutual orientation of vibration axis and thermal or compositional gradient. Harmonic vibrations can considerably deviate the equilibrium position of an interface from its normally horizontal position under gravity acceleration and attain large enough angles. Using vibration, it is possible to stabilize two-fluid configurations, generally unstable when the vibration is absent.
