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Soutenance de David Dumont

Energy flows in turbulent thermal convection
When Oct 25, 2021
from 01:30 to 03:30
Where Salle Condorcet (1 place de l'école)
Contact Name David Dumont
Attendees David Dumont
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Wind and ocean currents, heating systems and chimical reactors are partially or fully driven by thermal convection. Rayleigh-Bénard (RB) convection provides a general model, and its study aims to understand physics which determines the flows of such system. This model considers a fluid which is confined between two horizontal plates, which are heated at the bottom and cool down at the top. Density fluid fluctuations move the fluid between the two plates.

Along this experimental thesis, studied flows are fully turbulent, inhomogeneous and anisotropic. On the contrary, turbulence models are developped for homogeneous and isotropic flows. So, how can we characterized the turbulence observed in RB convection? Moreother, heating the bottom plate allows us to inject energy within the flows. The global energy transfer is well known (directed from the bottom to the top) but is largely misunderstood at small scale. So how the energy is transfered and distributed within the flow? Lastly, if it exists numerous technics to measure velocity fields within flows, it is more complex to do that for temperature. However, these technics would allow us to determine thermal flow and to enlight the plume effect in the local energy budget. But how to measure temperature field?