Abstract
Abstract
Highlights
In order to identify the large-scale circulations (LSC) based on local temperatures, the evolution of the spatial interpolation between the rear-wall sensors is displayed in figure 4 for the considered cases S and C
It displays the respective time-averaged temperature distributions on the left side: while the two hot spots (L/4, 3L/4) of the stable periods become visible for case S, the distribution of case C shows no clear structures as this case did not exhibit stable periods
Mixed convection flow in a cuboidal sample was investigated for two cases of different Richardson numbers, RiS = 3.7 and RiC = 1.5, in order to determine to what extent concepts of Rayleigh–Bénard convection (RBC) can be transferred to the occurring spontaneous or continuous flow reconfigurations
Summary
Our aim is to show to which extent model concepts for pure thermal convection apply to cases of mixed convection where thermal convection is superimposed by forced convection. Such model concepts exist for Rayleigh–Bénard convection (RBC) for a variety of regimes and geometries: Villermaux (1995) developed a model explaining oscillating instabilities in two-dimensional square samples as a coupling between the bottom and top boundary layers: as plumes emitted from one boundary layer impinge on the other boundary layer, they cause an instability, leading to a new emission of a plume with the opposite temperature deviation and flow direction. These studies comprise in particular time correlations of local temperature and velocity measurements (Qiu et al 2004) as well as cross-sectional velocity fields (Sun, Xia & Tong 2005)
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