Confined Rayleigh-Benard, Rotating Rayleigh-Benard, and Double Diffusive   Convection: A Unifying View on Turbulent Transport Enhancement through   Coherent Structure Manipulation

doi:10.1103/PhysRevLett.119.064501

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	Confined Rayleigh-Benard, Rotating Rayleigh-Benard, and Double Diffusive Convection: A Unifying View on Turbulent Transport Enhancement through Coherent Structure Manipulation
	Chong, Kai Leong ; Yang, Yantao ; Huang, Shi-Di ; Zhong, Jin-Qiang ; Stevens, Richard J. A. M. ; Verzicco, Roberto ; Lohse, Detlef ; Xia, Ke-Qing
刊名	PHYSICAL REVIEW LETTERS
	2017
关键词	SMALL-SCALE PROPERTIES BOUNDARY-LAYER HEAT-TRANSFER FLOW SYSTEMS SOLIDS MOTION NUMBER BULK
DOI	10.1103/PhysRevLett.119.064501
英文摘要	Many natural and engineering systems are simultaneously subjected to a driving force and a stabilizing force. The interplay between the two forces, especially for highly nonlinear systems such as fluid flow, often results in surprising features. Here we reveal such features in three different types of Rayleigh-Benard (RB) convection, i.e., buoyancy-driven flow with the fluid density being affected by a scalar field. In the three cases different stabilizing forces are considered, namely (i) horizontal confinement, (ii) rotation around a vertical axis, and (iii) a second stabilizing scalar field. Despite the very different nature of the stabilizing forces and the corresponding equations of motion, at moderate strength we counterintuitively but consistently observe an enhancement in the flux, even though the flow motion is weaker than the original RB flow. The flux enhancement occurs in an intermediate regime in which the stabilizing force is strong enough to alter the flow structures in the bulk to a more organized morphology, yet not too strong to severely suppress the flow motions. Near the optimal transport enhancements all three systems exhibit a transition from a state in which the thermal boundary layer (BL) is nested inside the momentum BL to the one with the thermal BL being thicker than themomentum BL. The observed optimal transport enhancement is explained through an optimal coupling between the suction of hot or fresh fluid and the corresponding scalar fluctuations.; Hong Kong Research Grants Council [CUHK 404513]; NSFC/RGC [CUHK437/15, 11561161004]; Hong Kong PhD fellowship; Dutch Foundation for Fundamental Research on Matter (FOM); Netherlands Center for Multiscale Catalytic Energy Conversion (MCEC), a NWO Gravitation program - Ministry of Education, Culture, and Science of the government of Netherlands; Leibnitz-Rechenzentrum Munich [pr47vi]; PRACE [2016143351]; SCI(E); ARTICLE; 6; 119
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/471575]
专题	工学院
推荐引用方式 GB/T 7714	Chong, Kai Leong,Yang, Yantao,Huang, Shi-Di,et al. Confined Rayleigh-Benard, Rotating Rayleigh-Benard, and Double Diffusive Convection: A Unifying View on Turbulent Transport Enhancement through Coherent Structure Manipulation[J]. PHYSICAL REVIEW LETTERS,2017.
APA	Chong, Kai Leong.,Yang, Yantao.,Huang, Shi-Di.,Zhong, Jin-Qiang.,Stevens, Richard J. A. M..,...&Xia, Ke-Qing.(2017).Confined Rayleigh-Benard, Rotating Rayleigh-Benard, and Double Diffusive Convection: A Unifying View on Turbulent Transport Enhancement through Coherent Structure Manipulation.PHYSICAL REVIEW LETTERS.
MLA	Chong, Kai Leong,et al."Confined Rayleigh-Benard, Rotating Rayleigh-Benard, and Double Diffusive Convection: A Unifying View on Turbulent Transport Enhancement through Coherent Structure Manipulation".PHYSICAL REVIEW LETTERS (2017).