Evolution and statistics of thermal plumes in tilted turbulent convection

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 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
刊名	INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
	2017
卷号	111 页码:933-942
关键词	Turbulent convection Thermal plumes Nusselt number Plume area density Plume velocity
通讯作者	sqzhou@scsio.ac.cn
中文摘要	We 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.
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/16460]
专题	南海海洋研究所_热带海洋环境国家重点实验室(LTO)
推荐引用方式 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.(2017).Evolution 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.