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题名

Universal fluctuations in the bulk of Rayleigh-Benard turbulence

作者
通讯作者Xie, Yi-Chao; Xia, Ke-Qing
发表日期
2019-11-10
DOI
发表期刊
ISSN
0022-1120
EISSN
1469-7645
卷号878页码:878R11-878R113
摘要

We present an investigation of the root-mean-square (r.m.s.) temperature sigma(T) and the r.m.s. velocity sigma(w) in the bulk of Rayleigh-Benard turbulence, using new experimental data from the current study and experimental and numerical data from previous studies. We find that, once scaled by the convective temperature theta(*), the value of sigma(T) at the cell centre is a constant (sigma(T,c)/theta(*) approximate to 0.85) over a wide range of the Rayleigh number (10(8) <= Ra <= 10(15)) and the Prandtl number (0.7 <= Pr <= 23.34), and is independent of the surface topographies of the top and bottom plates of the convection cell. A constant close to unity suggests that theta(*) is a proper measure of the temperature fluctuation in the core region. On the other hand, sigma(w,c)/w(*), the vertical r.m.s. velocity at the cell centre scaled by the convective velocity w(*), shows a weak Ra-dependence (similar to Ra-0.07 +/- 0.02) over 10(8) <= Ra <= 10(10) at Pr similar to 4.3 and is independent of plate topography. Similar to a previous finding by He & Xia (Phys. Rev. Lett., vol. 122, 2019, 014503), we find that the r.m.s. temperature profile sigma(T)(z)/theta(*) in the region of the mixing zone with a mean horizontal shear exhibits a power-law dependence on the distance z from the plate, but now the universal profile applies to both smooth and rough surface topographies and over a wider range of Ra. The vertical r.m.s. velocity profile sigma(w)(z)/w(*) obeys a logarithmic dependence on z. The study thus demonstrates that the typical scales for the temperature and the velocity are the convective temperature theta(*) and the convective velocity w(*), respectively. Finally, we note that theta(*) may be utilised to study the flow regime transitions in ultrahigh-Ra-number turbulent convection.

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相关链接[来源记录]
收录类别
SCI ; EI
语种
英语
学校署名
通讯
资助项目
Hong Kong Research Grant Council[CUHK 14301115] ; Hong Kong Research Grant Council[14302317]
WOS研究方向
Mechanics ; Physics
WOS类目
Mechanics ; Physics, Fluids & Plasmas
WOS记录号
WOS:000484935600001
出版者
EI入藏号
20193707428584
EI主题词
Heat convection ; Prandtl number ; Surface topography ; Topography ; Turbulence
EI分类号
Heat Transfer:641.2 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951
ESI学科分类
ENGINEERING
来源库
Web of Science
引用统计
被引频次[WOS]:13
成果类型期刊论文
条目标识符http://kc.sustech.edu.cn/handle/2SGJ60CL/25077
专题工学院_力学与航空航天工程系
作者单位
1.Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
2.Southern Univ Sci & Technol, Ctr Complex Flows & Soft Matter Res, Shenzhen 518055, Peoples R China
3.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Peoples R China
第一作者单位南方科技大学;  力学与航空航天工程系
通讯作者单位南方科技大学;  力学与航空航天工程系
推荐引用方式
GB/T 7714
Xie, Yi-Chao,Cheng, Bu-Ying-Chao,Hu, Yun-Bing,et al. Universal fluctuations in the bulk of Rayleigh-Benard turbulence[J]. JOURNAL OF FLUID MECHANICS,2019,878:878R11-878R113.
APA
Xie, Yi-Chao,Cheng, Bu-Ying-Chao,Hu, Yun-Bing,&Xia, Ke-Qing.(2019).Universal fluctuations in the bulk of Rayleigh-Benard turbulence.JOURNAL OF FLUID MECHANICS,878,878R11-878R113.
MLA
Xie, Yi-Chao,et al."Universal fluctuations in the bulk of Rayleigh-Benard turbulence".JOURNAL OF FLUID MECHANICS 878(2019):878R11-878R113.
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