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• W2891063265 abstract "We investigate the dependency of the magnitude of heat transfer in a convection cell as a function of its inclination by means of experiments and simulations. The study is performed with a working fluid of large Prandtl number, $Pr simeq 480$, and at Rayleigh numbers $Ra simeq 10^{8}$ and $Ra simeq 5 times 10^{8}$ in a quasi-two-dimensional rectangular cell with unit aspect ratio. By changing the inclination angle ($beta$) of the convection cell, the character of the flow can be changed from moderately turbulent, for $beta = 0^o$, to laminar and steady at $beta = 90^o$. The global heat transfer is found to be insensitive to the drastic reduction of turbulent intensity, with maximal relative variations of the order of $20%$ at $Ra simeq 10^{8}$ and $10%$ at $Ra simeq 5 times 10^{8}$, while the Reynolds number, based on the global root-mean- square velocity, is strongly affected with a decay of more than $85%$ occurring in the laminar regime. We show that the intensity of the heat flux in the turbulent regime can be only weakly enhanced by establishing a large scale circulation flow by means of small inclinations. On the other hand, in the laminar regime the heat is transported solely by a slow large scale circulation flow which exhibits large correlations between the velocity and temperature fields. For inclination angles close to the transition regime in-between the turbulent-like and laminar state, a quasi-periodic heat-flow bursting phenomenon is observed." @default.
• W2891063265 created "2018-09-27" @default.
• W2891063265 creator A5045430322 @default.
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• W2891063265 date "2019-01-22" @default.
• W2891063265 modified "2023-10-09" @default.
• W2891063265 title "Robustness of heat transfer in confined inclined convection at high Prandtl number" @default.
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• W2891063265 doi "https://doi.org/10.1103/physreve.99.013108" @default.
• W2891063265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30780316" @default.
• W2891063265 hasPublicationYear "2019" @default.
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