Boundary-Layer Disruption and Heat-Transfer Enhancement in Convection Turbulence by Oscillating Deformations of Boundary
In this Letter, we propose a novel strategy for significantly enhancing the heat transfer in convection turbulence. By introducing a boundary deformation of the standing-wave type, flow modulation can be realized when the amplitude is comparable or larger than the boundary-layer thickness. For a fixed moderate frequency, the entire fluid layer follows the boundary motion at small wave numbers, while only the near-wall regions are affected by the boundary deformation at large wave numbers. The heat-flux enhancement happens for the latter. For a fixed wave number and gradually increasing frequency, the vortical flows inside the wave valleys exhibit nonlinear transition and alter the distribution of boundary heat flux, and the global heat flux increases significantly at large enough frequencies. The current findings suggest that oscillating deformations of boundary can efficiently break the boundary layers, which serves as the bottleneck of global heat transfer, and open a new venue for modulating the convection turbulence.
NI Journal Papers
National Nature Science Foundation of China ; Laoshan Laboratory[LSKJ202202000]
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|Document Type||Journal Article|
|Department||Department of Mechanics and Aerospace Engineering|
1.State Key Laboratory for Turbulence and Complex Systems,Department of Mechanics and Engineering Science\,College of Engineering,Peking University,Beijing,100871,China
2.College of Aerospace Science and Engineering,National University of Defense Technology,Changsha,410073,China
3.Joint Laboratory of Marine Hydrodynamics and Ocean Engineering,Laoshan Laboratory,Shandong,266299,China
4.Eastern Institute for Advanced Study,Eastern Institute of Technology,Ningbo,Zhejiang,315200,China
5.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
Yuan，Leiqi,Zou，Shufan,Yang，Yantao,et al. Boundary-Layer Disruption and Heat-Transfer Enhancement in Convection Turbulence by Oscillating Deformations of Boundary[J]. Physical Review Letters,2023,130(20).
Yuan，Leiqi,Zou，Shufan,Yang，Yantao,&Chen，Shiyi.(2023).Boundary-Layer Disruption and Heat-Transfer Enhancement in Convection Turbulence by Oscillating Deformations of Boundary.Physical Review Letters,130(20).
Yuan，Leiqi,et al."Boundary-Layer Disruption and Heat-Transfer Enhancement in Convection Turbulence by Oscillating Deformations of Boundary".Physical Review Letters 130.20(2023).
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