How surface roughness reduces heat transport for small roughness heights in turbulent Rayleigh–Bénard convection
Rough surfaces have been widely used as an efficient way to enhance the heat-transfer
efficiency in turbulent thermal convection. In this paper, however, we show that roughness …
efficiency in turbulent thermal convection. In this paper, however, we show that roughness …
Roughness-Facilitated Local Scaling Does Not Imply the Onset of the Ultimate Regime of Thermal Convection
In thermal convection, roughness is often used as a means to enhance heat transport,
expressed in Nusselt number. Yet there is no consensus on whether the Nusselt vs Rayleigh …
expressed in Nusselt number. Yet there is no consensus on whether the Nusselt vs Rayleigh …
Roughness as a route to the ultimate regime of thermal convection
We use highly resolved numerical simulations to study turbulent Rayleigh-Bénard
convection in a cell with sinusoidally rough upper and lower surfaces in two dimensions for …
convection in a cell with sinusoidally rough upper and lower surfaces in two dimensions for …
Scaling enabled by multiscale wall roughness in Rayleigh–Bénard turbulence
In turbulent Rayleigh–Bénard (RB) convection with regular, mono-scale, surface roughness,
the scaling exponent, when the smaller roughness elements fully protrude through the …
the scaling exponent, when the smaller roughness elements fully protrude through the …
Radiative heating achieves the ultimate regime of thermal convection
The absorption of light or radiation drives turbulent convection inside stars, supernovae,
frozen lakes, and Earth's mantle. In these contexts, the goal of laboratory and numerical …
frozen lakes, and Earth's mantle. In these contexts, the goal of laboratory and numerical …
Turbulent thermal convection over rough plates with varying roughness geometries
We present a systematic investigation of the effects of roughness geometry on turbulent
Rayleigh–Bénard convection (RBC) over rough plates with pyramid-shaped and periodically …
Rayleigh–Bénard convection (RBC) over rough plates with pyramid-shaped and periodically …
The-dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard convection
JL Yang, YZ Zhang, T **, YH Dong… - Journal of Fluid …, 2021 - cambridge.org
The Pr-dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard
convection Page 1 J. Fluid Mech. (2021), vol. 911, A52, doi:10.1017/jfm.2020.1091 The Pr-dependence …
convection Page 1 J. Fluid Mech. (2021), vol. 911, A52, doi:10.1017/jfm.2020.1091 The Pr-dependence …
Shear-induced modulation on thermal convection over rough plates
TC **, JZ Wu, YZ Zhang, YL Liu… - Journal of Fluid …, 2022 - cambridge.org
External modulation on thermal convection has been studied extensively to achieve the
control of flow structures and heat-transfer efficiency. In this paper, we carry out direct …
control of flow structures and heat-transfer efficiency. In this paper, we carry out direct …
Enhanced heat transfer and reduced flow reversals in turbulent thermal convection with an obstructed centre
We report an experimental study about the effect of an obstructed centre on heat transport
and flow reversal by inserting an adiabatic cylinder at the centre of a quasi-two-dimensional …
and flow reversal by inserting an adiabatic cylinder at the centre of a quasi-two-dimensional …
Wall roughness induces asymptotic ultimate turbulence
Turbulence governs the transport of heat, mass and momentum on multiple scales. In real-
world applications, wall-bounded turbulence typically involves surfaces that are rough; …
world applications, wall-bounded turbulence typically involves surfaces that are rough; …