Average thermal convection of an incompressible fluid performing high-frequency oscillations in a straight channel at rest is considered. It is shown that the Stokes layers play an important role in the excitation of average flows, in addition to the classical thermovibrational mechanism. Skin-layer flow generation is identified as a mechanism additional to the thermovibrational mechanism whose contribution is determined by the relative oscillation amplitude: it can have both a destabilizing and a stabilizing effect, depending on the amplitude.
Bibliographical noteFunding Information:
The work was partially supported by the Russian Foundation for Basic Research (project No. 00-01-416). The author also wishes to thank the administration of the Ecole Centrale de Paris (the paper was written when the author was at ECP).
- Stokes boundary layers
- Thermal convection