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Regime crossover in Rayleigh–Bénard convection with mixed boundary conditions

Published online by Cambridge University Press:  30 September 2020

Rodolfo Ostilla-Mónico Open the ORCID record for Rodolfo Ostilla-Mónico [Opens in a new window]  and
Amit Amritkar Open the ORCID record for Amit Amritkar [Opens in a new window]
Rodolfo Ostilla-Mónico*
Affiliation:
Department of Mechanical Engineering, University of Houston, Houston, TX77204, USA
Amit Amritkar
Affiliation:
Department of Mechanical Engineering, University of Houston, Houston, TX77204, USA HPE Data Science Institute, University of Houston, Houston, TX77204, USA
*
†Email address for correspondence: [email protected]
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Abstract

We numerically simulate three-dimensional Rayleigh–Bénard convection, the flow in a fluid layer heated from below and cooled from above, with inhomogeneous temperature boundary conditions, to explore two distinct regimes described in recent literature. We fix the non-dimensional temperature difference, i.e. the Rayleigh number, to $Ra=10^8$, and vary the Prandtl number between $1$ and $100$. By introducing stripes of adiabatic boundary conditions on the top plate, and making the surface of the top plate only $50\,\%$ conducting, we modify the heat transfer, the average temperature profiles and the underlying flow properties. We find two regimes: when the pattern wavelength is small, the flow is barely affected by the stripes. The heat transfer is reduced, but remains a large fraction of that of the unmodified case, and the underlying flow is only slightly modified. When the pattern wavelength is large, the heat transfer saturates to approximately two-thirds of the value of the unmodified problem, the temperature in the bulk increases substantially, and velocity fluctuations in the directions normal to the stripes are enhanced. The transition between the two regimes happens at pattern wavelength around the distance between the two plates, with different quantities transitioning at slightly different wavelength values. This transition is approximately Prandtl-number-independent, even if the statistics in the long-wavelength regime slightly vary.

JFM classification

Geophysical and Geological Flows: Mantle convection Turbulent Flows: Turbulent convection
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 903 , 25 November 2020 , A39
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Copyright
© The Author(s), 2020. Published by Cambridge University Press

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References

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