"Ultimate state" of two-dimensional Rayleigh-Benard convection between free-slip fixed temperature boundaries

Details "Ultimate state" of two-dimensional Rayleigh-Benard convection between free-slip fixed temperature boundaries "Ultimate state" of two-dimensional Rayleigh-Benard convection between free-slip fixed temperature boundaries

2011-04-12

arxiv.org/abs/1104.2278v1

Physics

Fluid Dynamics

4 pages

Scientific paper

Rigorous upper limits on the vertical heat transport in two dimensional Rayleigh-Benard convection between stress-free isothermal boundaries are derived from the Boussinesq approximation of the Navier-Stokes equations. The Nusselt number Nu is bounded in terms of the Rayleigh number Ra according to $Nu \leq 0.2295 Ra^{5/12}$ uniformly in the Prandtl number Pr. This Nusselt number scaling challenges some theoretical arguments regarding the asymptotic high Rayleigh number heat transport by turbulent convection.

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