Journal of Fluid Mechanics, 2021, 907: A12. Thermal convection over fractal surfaces. Journal of Fluid Mechanics, 2019, 869: R4. Nu∼Ra 1/2 scaling enabled by multiscale wall roughness in Rayleigh-Bénard turbulence. International Journal of Heat and Mass Transfer, 2018, 121: 872–883. Heat transport enhancement and scaling law transition in two-dimensional Rayleigh-Bénard convection with rectangular-type roughness. Roughness-facilitated local 1/2 scaling does not imply the onset of the ultimate regime of thermal convection. Roughness as a route to the ultimate regime of thermal convection. ![]() Turbulent thermal convection over rough plates with varying roughness geometries. Observation of the 1/2 power law in Rayleigh-Bénard convection. Random roughness of boundary increases the turbulent convection scaling exponent. Turbulent thermal convection in a cell with ordered rough boundaries. Enhanced heat transport in turbulent convection over a rough surface. Turbulent convection over rough surfaces. Theoretical and Applied Mechanics Letters, 2013, 3(5): 052001. Current trends and future directions in turbulent thermal convection. The European Physical Journal E, 2012, 35(7): 58. New perspectives in turbulent Rayleigh-Bénard convection. Annual Review of Fluid Mechanics, 2010, 42: 335–364.Ĭhilla F., Schumacher J. ![]() Small-scale properties of turbulent Rayleigh-Bénard convection. Heat transfer and large scale dynamics in turbulent Rayleigh-Bénard convection. The influences of the ratchet orientation on the heat transfer and the flow structure are discussed and analyzed.Īhlers G., Grossmann S., Lohse D. ![]() In the presence of the roughness, a sharp jump of the Nu values is identified as the Ra value is slightly increased, accompanied with the dramatic changes of the large-scale flow structure and the plume dynamics. We find that the roughness can have a significant influence on the organization of the secondary corner rolls, and the corner rolls are evidently suppressed by the roughness for intermediate values of Ra. The influences of the roughness on the heat transfer and the flow structure are found to be strongly dependent on both Ra and the roughness geometry. We consider two aspect ratios of roughness γ = 1, 2 and the range of the Rayleigh number 1.0 × 10 6 ≤ Ra ≤ 2.0 × 10 10 with the Prandtl number Pr = 4. This paper presents a numerical study of the Rayleigh-Bénard convection (RBC) in two-dimensional cells with asymmetric (ratchet) roughness distributed on the top and bottom surfaces.
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