Measured thermal dissipation field in turbulent Rayleigh-Benard convection

被引：30
|
作者：
He, Xiaozhou
Tong, Penger
Xia, Ke-Qing
机构：
[1] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China
[2] Chinese Univ Hong Kong, Dept Phys, Shatin, Hong Kong, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 14期
关键词：
D O I：
10.1103/PhysRevLett.98.144501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The time-averaged local thermal dissipation rate epsilon(N)(r) in turbulent convection is obtained from direct measurements of the temperature gradient vector in a cylindrical cell filled with water. It is found that epsilon(N)(r) contains two contributions. One is generated by thermal plumes, present mainly in the plume-dominated bulk region, and decreases with increasing Rayleigh number Ra. The other contribution comes from the mean temperature gradient, being concentrated in the thermal boundary layers, and increases with Ra. The experiment thus provides a new physical picture about the thermal dissipation field in turbulent convection.
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页数：4
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