The effect of cell tilting on turbulent thermal convection in a rectangular cell
Guo, Shuang-Xi; Zhou, Sheng-Qi; Cen, Xian-Rong; Qu, Ling; Lu, Yuan-Zheng; Sun, Liang; Shang, Xiao-Dong; sqzhou@scsio.ac.cn
2015
发表期刊JOURNAL OF FLUID MECHANICS
卷号762页码:273-287
文章类型0022-1120
摘要In the study, the influence of cell tilting on flow dynamics is explored experimentally in a rectangular cell (aspect ratios Gamma(x) = 1 and Gamma(y) = 0.25 ). The measurements are carried out in a wide range of tilt angles (0 <= beta <= pi/2 rad) at Prandtl number (Pr similar or equal to 6.3 ) and Rayleigh number (Ra similar or equal to 4.42 x 10(9) ). With the velocity measurements, the large-scale circulation (LSC) is found to be sensitive to the symmetry of the system. In the level case, the LSC is at about quarter width of the cell. As the cell is slightly tilted (beta similar or equal to 0.04 rad), the LSC moves quickly towards the boundary. With increasing beta , the LSC changes gradually from oblique ellipse-like to square-like, and to more complicated patterns. Oscillation has been found for almost all beta, and are strongest at around beta similar or equal to 0.48 rad. As beta increases, the Reynolds number (Re) initially also increases, until it reaches its maximum at the transition angle beta = 0 .15 rad, after which it gradually decreases. The cell tilting causes a pronounced reduction of the Nusselt number (Nu). As beta increases from 0 to 0.15, 1.05 and pi/2 rad, the reduction of Nu is approximately 1.4 %, 5% and 18 %, respectively. Over the ranges of 0 <= beta <= 0.15 rad, 0.15 <= beta <= 1.05 rad and 1.05 <= beta <= pi/2 rad, the decay slopes are 8.57 x 10 (2), 3.27 x 10 (2) and 0.24 rad (-1), respectively.
部门归属[Guo, Shuang-Xi; Zhou, Sheng-Qi; Cen, Xian-Rong; Qu, Ling; Lu, Yuan-Zheng; Shang, Xiao-Dong] Chinese Acad Sci, State Key Lab Trop Oceanog, South China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; [Lu, Yuan-Zheng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Sun, Liang] Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230022, Peoples R China ; LTO
关键词Benard Convection Turbulent Convection
学科领域Mechanics ; Physics
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/15135
专题热带海洋环境国家重点实验室(LTO)
通讯作者sqzhou@scsio.ac.cn
推荐引用方式
GB/T 7714
Guo, Shuang-Xi,Zhou, Sheng-Qi,Cen, Xian-Rong,et al. The effect of cell tilting on turbulent thermal convection in a rectangular cell[J]. JOURNAL OF FLUID MECHANICS,2015,762:273-287.
APA Guo, Shuang-Xi.,Zhou, Sheng-Qi.,Cen, Xian-Rong.,Qu, Ling.,Lu, Yuan-Zheng.,...&sqzhou@scsio.ac.cn.(2015).The effect of cell tilting on turbulent thermal convection in a rectangular cell.JOURNAL OF FLUID MECHANICS,762,273-287.
MLA Guo, Shuang-Xi,et al."The effect of cell tilting on turbulent thermal convection in a rectangular cell".JOURNAL OF FLUID MECHANICS 762(2015):273-287.
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