Abstract
Abstract
Highlights
Rayleigh–Bénard (RB) convection is the fluid flow driven by the buoyancy forces arising from temperature gradients acting in the direction opposite to gravity
A peculiarity of the present experiment is that the convection cell has a smaller size than systems that have been investigated previously in the literature, and this allows velocimetry measurements in the whole interior of the convection cell
Proper orthogonal decomposition of the fluctuating velocity field has been used for such a purpose
Summary
Rayleigh–Bénard (RB) convection is the fluid flow driven by the buoyancy forces arising from temperature gradients acting in the direction opposite to gravity. The same Grossman–Lohse theory (Grossmann & Lohse 2000, 2001, 2002, 2004), which constituted an attempt to unify experimental and numerical data from the manifold of works available in the literature, relies on the theoretical assumption that the turbulent bulk and the boundary layers on the plates and the lateral wall contribute with different mechanisms (and different scaling laws) to the time- and volume-averages of the kinetic and thermal energy-dissipation rates This leads to a classification of different flow regimes in the Ra–Pr parametric space, based on the prevalence of one contribution over the other.
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