SCSIO OpenIR  > 热带海洋环境国家重点实验室(LTO)
Evolution and statistics of thermal plumes in tilted turbulent convection
Guo, SX; Zhou, SQ; Qu, L; Cen, XR; Lu, YZ;
AbstractWe present a systematic experimental study of thermal plumes within tilted turbulent thermal convection using the shadowgraph technique. The measurements are performed in a rectangular cell (aspect ratio Gamma(x) =1 and Gamma(y) = 0.25) over a wide range of tilt angles (0 <= beta <= pi/2 rad) at constant Prandtl (Pr similar or equal to 10) and Rayleigh (Ra similar or equal to 6.80 x 10(10)) numbers. It is found that the plume width, lambda, is distributed log-normally in space and the time-averaged most probable plume width, , has similar scale with the thermal boundary layer thickness, lambda(T). and lambda(T) slowly increase as tilt angle, beta, increases from 0 to 1 rad and they broaden rapidly as beta > 1 rad. The average plume area density, (Phi), deduced from the image intensity, is proposed to represent the heat flux of thermal plumes. Its beta dependence is consistent with that of the Nusselt number, Nu, over the tilt angle range. lambda(p) and Phi exhibit oscillation of convective flow. The oscillation intensity and period strongly depend on beta, but are less affected by Ra and Pr. The plume velocity exhibits a different pattern from that of the two-dimensional convective flow measured at Pr similar or equal to 6.3 and Ra similar or equal to 4.42 x 10(9). The magnitude of plume velocity peak is weakly affected by the cell tilting. The position of the plume velocity peak increases linearly with increasing beta. (C) 2017 Elsevier Ltd. All rights reserved.
Department[Guo, Shuang-Xi; Zhou, Sheng-Qi; Qu, Ling; Cen, Xian-Rong; Lu, Yuan-Zheng] Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou 510301, Guangdong, Peoples R China
KeywordTurbulent Convection Thermal Plumes Nusselt Number Plume Area Density Plume Velocity
Funding ProjectLTO
Document Type期刊论文
Recommended Citation
GB/T 7714
Guo, SX,Zhou, SQ,Qu, L,et al. Evolution and statistics of thermal plumes in tilted turbulent convection[J]. INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,2017,111:933-942.
APA Guo, SX,Zhou, SQ,Qu, L,Cen, XR,Lu, YZ,& and statistics of thermal plumes in tilted turbulent convection.INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER,111,933-942.
MLA Guo, SX,et al."Evolution and statistics of thermal plumes in tilted turbulent convection".INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 111(2017):933-942.
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