Natural convection in a circular enclosure with an internal cylinder of regular polygon geometry
Natural convection in a circular enclosure with an internal cylinder of regular polygon geometry
复制标题
具有正多边形内部圆柱体的圆形外壳中的自然对流
DOI：
10.1063/1.5100892
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发表时间：
2019-06
期刊：
影响因子：
1.6
通讯作者：
Wei Zhang
中科院分区：
文献类型：
--
作者：
Yanping Wang;Jie Chen;Wei Zhang
This work presents a numerical investigation on the natural convection heat transfer in a circular enclosure with an internal cylinder at Ra=103-106 in both conduction and convection dominant regimes. The cross-section of the cylinder is of regular polygon geometry with various numbers of edges, including circle, triangle, square, pentagon and hexagon. The polygon cylinders are positioned at two orientations, i.e., the corner-upward and edge-upward orientations where one of the sharp corners or flat edges faces upward. The simulations are performed using our in-house fourth-order finite difference code which is well validated. Our objective is to explore the effects of cylinder geometry and orientation on the thermal and flow characteristics. The results are presented and analysed by the total equivalent conductivity coefficient for the quantitative assessment of the contribution of fluid circulation, the streamlines and thermal fields for the flow pattern and qualitative evaluation of heat transfer performance, and the distributions of local heat transfer rate on the surfaces of cylinder and enclosure. We also perform the first synergy principle analysis on this physical model to identify how the fluid circulation contributes to the heat transfer and its spatial behaviours. Numerical results reveal that the corner-upward orientation generally exhibits better heat transfer performance by permitting the well development of flow above the cylinder and in the top region of the enclosure.This work presents a numerical investigation on the natural convection heat transfer in a circular enclosure with an internal cylinder at Ra=103-106 in both conduction and convection dominant regimes. The cross-section of the cylinder is of regular polygon geometry with various numbers of edges, including circle, triangle, square, pentagon and hexagon. The polygon cylinders are positioned at two orientations, i.e., the corner-upward and edge-upward orientations where one of the sharp corners or flat edges faces upward. The simulations are performed using our in-house fourth-order finite difference code which is well validated. Our objective is to explore the effects of cylinder geometry and orientation on the thermal and flow characteristics. The results are presented and analysed by the total equivalent conductivity coefficient for the quantitative assessment of the contribution of fluid circulation, the streamlines and thermal fields for the flow pattern and qualitative evaluation of heat transfer perfo...
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影响因子：
5.2
作者：
S. S. Ghadikolaei-S.;Kh. Hosseinzadeh;D. D. Ganji-D.
通讯作者：
S. S. Ghadikolaei-S.;Kh. Hosseinzadeh;D. D. Ganji-D.
倾斜三角柱低稀土流的流动不稳定性和稳定性特性
影响因子：
2
作者：
Zhang Wei;Yang Hui;Dou Hua-Shu;Zhu Zuchao
通讯作者：
Zhu Zuchao
DOI：
10.1016/j.icheatmasstransfer.2017.10.015
发表时间：
2018
影响因子：
7
作者：
Wei Zhang;Yi-kun Wei;Xiao-ping Chen;H. Dou;Zuchao Zhu
通讯作者：
Wei Zhang;Yi-kun Wei;Xiao-ping Chen;H. Dou;Zuchao Zhu
DOI：
10.1016/j.ijheatmasstransfer.2018.10.125
发表时间：
2019-03
影响因子：
5.2
作者：
Wei Zhang;Xiao-ping Chen;Hui Yang;H. Liang;Yi-kun Wei
通讯作者：
Wei Zhang;Xiao-ping Chen;Hui Yang;H. Liang;Yi-kun Wei
DOI：
10.1080/10407782.2015.1032016
发表时间：
2015-06
期刊：
Numerical Heat Transfer, Part A: Applications
影响因子：
--
作者：
Xing Yuan;F. Tavakkoli;K. Vafai
通讯作者：
Xing Yuan;F. Tavakkoli;K. Vafai