Boundary-Layer Disruption and Heat-Transfer Enhancement in Convection Turbulence by Oscillating Deformations of Boundary

Yuan，Leiqi1; Zou，Shufan2; Yang，Yantao1,3; Chen，Shiyi1,4,5

2023-05-19

10.1103/PhysRevLett.130.204001

Physical Review Letters   Impact Factor & Quartile

0031-9007

1079-7114

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.

SCI

English

NI Journal Papers

Others

National Nature Science Foundation of China[11988102] ; Laoshan Laboratory[LSKJ202202000]

Physics

Physics, Multidisciplinary

WOS:000999713600008

AMER PHYSICAL SOC

PHYSICS

2-s2.0-85160899180

Scopus

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).