Lagrangian velocity and acceleration measurements in plume-rich regions of turbulent Rayleigh-Bénard convection

2021 ◽  
Vol 6 (5) ◽  
Author(s):  
Xiao-Ming Li ◽  
Shi-Di Huang ◽  
Rui Ni ◽  
Ke-Qing Xia
Keyword(s):  
Bénard Convection ◽  
Benard Convection ◽  
Lagrangian Velocity ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

scholarly journals Velocity and acceleration statistics in rapidly rotating Rayleigh–Bénard convection

2018 ◽  
Vol 857 ◽  
pp. 374-397 ◽  
Author(s):  
Hadi Rajaei ◽  
Kim M. J. Alards ◽  
Rudie P. J. Kunnen ◽  
Herman J. H. Clercx
Keyword(s):  
Heat Transfer ◽  
Boundary Layers ◽  
Flow Structures ◽  
Regime Transition ◽  
Bénard Convection ◽  
Benard Convection ◽  
Lagrangian Velocity ◽  
Neutrally Buoyant ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

Background rotation causes different flow structures and heat transfer efficiencies in Rayleigh–Bénard convection. Three main regimes are known: rotation unaffected, rotation affected and rotation dominated. It has been shown that the transition between rotation-unaffected and rotation-affected regimes is driven by the boundary layers. However, the physics behind the transition between rotation-affected and rotation-dominated regimes are still unresolved. In this study, we employ the experimentally obtained Lagrangian velocity and acceleration statistics of neutrally buoyant immersed particles to study the rotation-affected and rotation-dominated regimes and the transition between them. We have found that the transition to the rotation-dominated regime coincides with three phenomena; suppressed vertical motions, strong penetration of vortical plumes deep into the bulk and reduced interaction of vortical plumes with their surroundings. The first two phenomena are used as confirmations for the available hypotheses on the transition to the rotation-dominated regime while the last phenomenon is a new argument to describe the regime transition. These findings allow us to better understand the rotation-dominated regime and the transition to this regime.

The -dependence of the critical roughness height in two-dimensional turbulent Rayleigh–Bénard convection

2021 ◽  
Vol 911 ◽  
Author(s):  
Jian-Lin Yang ◽  
Yi-Zhao Zhang ◽  
Tian-cheng Jin ◽  
Yu-Hong Dong ◽  
Bo-Fu Wang ◽  
...  
Keyword(s):  
Roughness Height ◽  
Two Dimensional ◽  
Bénard Convection ◽  
Benard Convection ◽  
Rayleigh Benard Convection ◽  
Rayleigh Benard

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