Laboratory Exploration of Heat Transfer Regimes in Rapidly Rotating Turbulent Convection
| Autor: | Cheng, Jonathan S., Madonia, Matteo, Guzmán, Andrés J. Aguirre, Kunnen, Rudie P. J. |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Phys. Rev. Fluids 5, 113501 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevFluids.5.113501 |
| Popis: | We report heat transfer and temperature profile measurements in laboratory experiments of rapidly rotating convection in water under intense thermal forcing (Rayleigh number $Ra$ as high as $\sim 10^{13}$) and unprecedentedly strong rotational influence (Ekman numbers $E$ as low as $10^{-8}$). Measurements of the mid-height vertical temperature gradient connect quantitatively to predictions from numerical models of asymptotically rapidly rotating convection, separating various flow phenomenologies. Past the limit of validity of the asymptotically-reduced models, we find novel behaviors in a regime we refer to as rotationally-influenced turbulence, where rotation is important but not as dominant as in the known geostrophic turbulence regime. The temperature gradients collapse to a Rayleigh-number scaling as $Ra^{-0.2}$ in this new regime. It is bounded from above by a critical convective Rossby number $Ro^*=0.06$ independent of domain aspect ratio $\Gamma$, clearly distinguishing it from well-studied rotation-affected convection. Comment: 14 pages, 7 figures |
| Databáze: | arXiv |
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