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| 1 | Heat transfer and plume statistics in turbulent thermal convection with sparse fractal roughness显示文摘Rough-surface Rayleigh-Benard convection is investigated using direct numerical simulations in two-dimensional convection cells with aspect ratioГ=2.Three types of fractal roughness elements,which are marked as nl,n2 and n3,are constructed based on the Koch curve and sparsely mounted on both the plates,where n denotes the level of the roughness.The considered Rayleigh numbers Ra range from 10^(7)to 10^(11)with Prandtl number Pr=1.Two regimes are identified for cases nl,n2.In Regime I,the scaling exponentsβin the effective Nusselt number Nu vs Ra scaling Nu~Ra^(β)reach up to about 0.4.However,when Ra is larger than a critical value Ra_(c),the flow enters RegimeⅡ,with p saturating back to a value close to the smooth-wall case(0.3).Rac is found to increase with increasing n,and for case n3,only Regime I is identified in the studied Ra range.The extension of Regime I in case n3 is due to the fact that at high Ra,the smallest roughness elements can play a role to disrupt the thermal boundary layers.The thermal dissipation rate is studied and it is found that the increasedβin Regime I is related with enhanced thermal dissipation rate in the bulk.An interesting finding is that no clear convection roll structures can be identified for the rough cases,which is different from the smooth case where well-organized convection rolls can be found.This difference is further quantified by the detailed analysis of the plume statistics,and it is found that the horizontal profiles of plume density and velocity are relatively flattened due to the absence of clear convection rolls. | Guang-chun Xu Qi Wang Zhen-hua Wan De-jun Sun | 2021 | Journal of Hydrodynamics2021，33，5： | 0 |
| 2 | Rayleigh-Bénard穿透对流的传热与对流斑图的实验研究显示文摘为研究Rayleigh-Bénard(RB)穿透对流系统的传热和对流斑图的流动特性,本实验采用径高比Γ≡D/L=1的圆柱形对流槽实验装置(D为对流槽直径,L为对流槽高度),以4℃左右的水为实验流体.水的密度在4.0℃时达到最大值,对流槽底板的温度为T_(b)(T_(b)>Ti=4.0℃),顶板温度为T_(t)(0 | 何川 李婷 韦萍 李慧敏 | 2021 | 力学季刊2021，42，3： | 0 |
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