Effects of rough walls on sheared annular centrifugal Rayleigh-Bénard convection
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arXiv
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| Format: | Preprint |
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2025
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| author | Xu, Fan Zhong, Jun Su, Jinghong Zhao, Bidan He, Yurong Sun, Chao Wang, Junwu |
| author_facet | Xu, Fan Zhong, Jun Su, Jinghong Zhao, Bidan He, Yurong Sun, Chao Wang, Junwu |
| contents | In this study, we investigate the coupling effects of roughness and wall shear in an annular centrifugal Rayleigh-Bénard convection (ACRBC) system, where two cylinders rotate with different angular velocities. Two-dimensional direct numerical simulations are conducted within a Rayleigh number range of $10^{6} \leq Ra \leq 10^{8}$, and the non-dimensional angular velocity difference ($\varOmega$), representing wall shear, varied from 0 to 1. The Prandtl number is fixed at $Pr = 4.3$, the inverse Rossby number at $Ro^{-1} = 20$, and the radius ratio at $η= 0.5$. The interaction between wall shear and roughness leads to distinct heat transfer behavior in different regimes. In the buoyancy-dominant regime, an increase in the non-dimensional angular velocity difference ($\varOmega$) significantly enhances heat transfer. However, as $\varOmega$ continues to rise, a sharp reduction in heat transfer is observed in the transitional regime. Beyond a critical value of $\varOmega$, the flow enters a shear-dominant regime, where heat transfer remains unchanged despite further increases in $\varOmega$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_15179 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Effects of rough walls on sheared annular centrifugal Rayleigh-Bénard convection Xu, Fan Zhong, Jun Su, Jinghong Zhao, Bidan He, Yurong Sun, Chao Wang, Junwu Fluid Dynamics In this study, we investigate the coupling effects of roughness and wall shear in an annular centrifugal Rayleigh-Bénard convection (ACRBC) system, where two cylinders rotate with different angular velocities. Two-dimensional direct numerical simulations are conducted within a Rayleigh number range of $10^{6} \leq Ra \leq 10^{8}$, and the non-dimensional angular velocity difference ($\varOmega$), representing wall shear, varied from 0 to 1. The Prandtl number is fixed at $Pr = 4.3$, the inverse Rossby number at $Ro^{-1} = 20$, and the radius ratio at $η= 0.5$. The interaction between wall shear and roughness leads to distinct heat transfer behavior in different regimes. In the buoyancy-dominant regime, an increase in the non-dimensional angular velocity difference ($\varOmega$) significantly enhances heat transfer. However, as $\varOmega$ continues to rise, a sharp reduction in heat transfer is observed in the transitional regime. Beyond a critical value of $\varOmega$, the flow enters a shear-dominant regime, where heat transfer remains unchanged despite further increases in $\varOmega$. |
| title | Effects of rough walls on sheared annular centrifugal Rayleigh-Bénard convection |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2501.15179 |