# Aspect ratio dependence of heat transport by turbulent Rayleigh–Bénard convection in rectangular cells

@article{Zhou2012AspectRD, title={Aspect ratio dependence of heat transport by turbulent Rayleigh–B{\'e}nard convection in rectangular cells}, author={Quan Zhou and Bo-Fang Liu and Chun-Mei Li and Bao-chang Zhong}, journal={Journal of Fluid Mechanics}, year={2012}, volume={710}, pages={260 - 276} }

Abstract We report high-precision measurements of the Nusselt number $Nu$ as a function of the Rayleigh number $Ra$ in water-filled rectangular Rayleigh–Bénard convection cells. The horizontal length $L$ and width $W$ of the cells are 50.0 and 15.0 cm, respectively, and the heights $H= 49. 9$ , 25.0, 12.5, 6.9, 3.5, and 2.4 cm, corresponding to the aspect ratios $({\Gamma }_{x} \equiv L/ H, {\Gamma }_{y} \equiv W/ H)= (1, 0. 3)$ , $(2, 0. 6)$ , $(4, 1. 2)$ , $(7. 3, 2. 2)$ , $(14. 3, 4. 3…

## 37 Citations

### Flow structures of turbulent Rayleigh–Bénard convection in annular cells with aspect ratio one and larger

- PhysicsActa Mechanica Sinica
- 2021

We present an experimental study of flow structures in turbulent Rayleigh–Benard convection in annular cells of aspect ratios $$\varGamma =1$$
, 2 and 4, and radius ratio $$\backsimeq $$
0.5. The…

### Turbulent Rayleigh–Bénard convection in an annular cell

- PhysicsJournal of Fluid Mechanics
- 2019

We report an experimental study of turbulent Rayleigh–Bénard (RB) convection in an annular cell of water (Prandtl number $Pr=4.3$ ) with a radius ratio $\unicode[STIX]{x1D702}\simeq 0.5$ . Global…

### Effects of geometric confinement in quasi-2-D turbulent Rayleigh–Bénard convection

- PhysicsJournal of Fluid Mechanics
- 2016

We report an experimental study of confinement effects in quasi-2-D turbulent Rayleigh–Bénard convection. The experiments were conducted in five rectangular cells with their height $H$ and length $L$…

### Effect of Prandtl number on heat transport enhancement in Rayleigh-B\'enard convection under geometrical confinement

- Physics
- 2017

We study, using direct numerical simulations, the effect of geometrical confinement on heat transport and flow structure in Rayleigh-B\'enard convection in fluids with different Prandtl numbers. Our…

### Thermal boundary layer structure in turbulent Rayleigh–Bénard convection in a rectangular cell

- PhysicsJournal of Fluid Mechanics
- 2013

Abstract We report high-spatial-resolution measurements of the thermal boundary layer (BL) properties in turbulent thermal convection. The experiment was made near the lower conducting plate of a…

### Measurements of heat transport by turbulent Rayleigh-Bénard convection in rectangular cells of widely varying aspect ratios

- Physics
- 2013

High-precision measurements of the Nusselt number Nu for Rayleigh-Bénard (RB) convection have been made in rectangular cells of water (Prandtl number Pr ≈ 5 and 7) with aspect ratios (Γx,Γy) varying…

### Exploring the severely confined regime in Rayleigh–Bénard convection

- PhysicsJournal of Fluid Mechanics
- 2016

We study the effect of severe geometrical confinement in Rayleigh–Bénard convection with a wide range of width-to-height aspect ratio $\unicode[STIX]{x1D6E4}$ , $1/128\leqslant…

### Counter-gradient heat transport in two-dimensional turbulent Rayleigh–Bénard convection

- PhysicsJournal of Fluid Mechanics
- 2013

Abstract We present high-resolution numerical investigations of heat transport by two-dimensional (2D) turbulent Rayleigh–Bénard (RB) convection over the Rayleigh number range $1{0}^{8} \leqslant…

### The effect of cell tilting on turbulent thermal convection in a rectangular cell

- PhysicsJournal of Fluid Mechanics
- 2014

Abstract In this study the influence of cell tilting on flow dynamics and heat transport is explored experimentally within a rectangular cell (aspect ratios ${\it\Gamma}_{x}=1$ and…

### Heat flux enhancement by regular surface roughness in turbulent thermal convection

- PhysicsJournal of Fluid Mechanics
- 2014

Abstract Direct numerical simulations (DNS) of turbulent thermal convection in a box-shaped domain with regular surface roughness at the heated bottom and cooled top surfaces are conducted for…

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