Controlling Heat Transport and Flow Structures in Thermal Turbulence Using Ratchet Surfaces

<p>We investigate how radiatively driven heating and cooling in the upper atmosphere (at pressures below 1 bar) influences the interior temperature profile (at pressures between 1 to 700 bar) by means of dynamical heat transport. To achieve this goal, we perform fully coupled 3D-radiation-hydrodymamical models with the new full RT 3D climate model MITgcm/ExoRadPRT for WASP-43 b and HD209458 b.&#160;We show in our simulations under which conditions the interior temperature profile converges to a hot deep adiabat. Furthermore, we show if differences occur between the non inflated WASP-43 b and the inflated HD209458 b due to different flow structures at depth for similar irradiation.</p>

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Large-scale flow structures and heat transport of turbulent forced and mixed convection in a closed rectangular cavity

International Journal of Heat and Fluid Flow ◽

10.1016/j.ijheatfluidflow.2011.06.006 ◽

2011 ◽

Vol 32 (5) ◽

pp. 889-900 ◽

Cited By ~ 14

Author(s):

D. Schmeling ◽

A. Westhoff ◽

M. Kühn ◽

J. Bosbach ◽

C. Wagner

Keyword(s):

Mixed Convection ◽

Heat Transport ◽

Large Scale ◽

Rectangular Cavity ◽

Flow Structures ◽

Large Scale Flow

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Flow structures and heat transport in Taylor–Couette systems with axial temperature gradient

Journal of Fluid Mechanics ◽

10.1017/jfm.2021.430 ◽

2021 ◽

Vol 920 ◽

Author(s):

X.-Y. Leng ◽

D. Krasnov ◽

B.-W. Li ◽

J.-Q. Zhong

Keyword(s):

Temperature Gradient ◽

Heat Transport ◽

Flow Structures ◽

Axial Temperature Gradient ◽

Axial Temperature ◽

Taylor Couette

Abstract

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Discrete transitions in turbulent convection

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1954.0196 ◽

1954 ◽

Vol 225 (1161) ◽

pp. 185-195 ◽

Cited By ~ 147

Keyword(s):

Heat Transport ◽

Thermal Gradients ◽

Mean Velocity ◽

Apparent Lack ◽

New Approach ◽

Thermal Turbulence ◽

Order Of Magnitude ◽

Vertical Barriers ◽

Theoretical Paper ◽

Rayleigh Numbers

The convection in a fluid between horizontal conducting surfaces is a very simple example of thermal turbulence, for the mean heat transport is independent of position while the distance between these surfaces is the only geometric parameter. This paper describes measurements of the heat transport and mean velocity in such convection up to Rayleigh numbers of 10 10 . Six discrete transitions in the slope of the heat-transport curve were observed between Rayleigh numbers of 1700 and 1000000. Although the thermal gradients vary by an order of magnitude from a boundary to the mid-regions of the fluid, these transitions appear to agree with those deduced on an assumption of a constant thermal gradient. Various visual observations of the fluctuating velocity field are also reported. Additional vertical barriers in the fluid markedly influence the horizontal flow but have negligible effect on the heat transport. This apparent lack of uniqueness of the flow patterns associated with a given heat transport suggests a new approach to turbulent phenomena discussed in a following theoretical paper.

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The heat transport and spectrum of thermal turbulence

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1954.0197 ◽

1954 ◽

Vol 225 (1161) ◽

pp. 196-212 ◽

Cited By ~ 317

Keyword(s):

Heat Transport ◽

Final Section ◽

Temperature Fields ◽

Thermal Gradients ◽

Hydrodynamic Equations ◽

Experimental Heat ◽

Thermal Turbulence ◽

Upper Limit ◽

The Mean ◽

Velocity And Temperature Fields

In this paper a theoretical investigation is made of various properties of the steady-state inhomogeneous turbulent convection of heat in a fluid between horizontal conducting surfaces. An upper limit to the heat transport is found subject to the constraint that some minimum eddy size exists which is effective in this transport. The spectrum of convecting motions, the mean thermal gradients at each point and the eddy conductivity are then determined in terms of the minimum eddy size. The relation between the boundary conditions and eddy size is studied by an extension of the work of Pellew & Southwell using the mean thermal gradients deduced when n 0 modes of motion are present to establish the Rayleigh number at which the ( n 0 +1)th mode first becomes unstable. In a final section the spectra and mean-square values of the fluctuating velocity and temperature fields are estimated from the Boussinesq form of the hydrodynamic equations. The previously reported experimental heat transports are within 10% of those predicted. The discrete transitions are within the error limits of the observations. However, further data must be mgathered to justify the use of minimum eddy size as a defining parameter in situations of geophysical scale.

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