关键词: 自然对流传热/
多孔介质/
格子Boltzmann方法
English Abstract
Simulation of effect of bottom heat source on natural convective heat transfer characteristics in a porous cavity by lattice Boltzmann method
He Zong-Xu1,Yan Wei-Wei1,
Zhang Kai1,
Yang Xiang-Long2,
Wei Yi-Kun3
1.College of Metrology and Measurement Engineering, China Jiliang University, Hangzhou 310018, China;
2.College of Civil Engineering, Shenzhen University, Shenzhen 518060, China;
3.Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou 310018, China
Fund Project:Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. LY15A020005) and the National Natural Science Foundation of China (Grant Nos. 11202203, 11472260, 11502237).Received Date:20 April 2017
Accepted Date:17 May 2017
Published Online:05 October 2017
Abstract:The influence of bottom heat source on natural convective heat transfer characteristics in a two-dimensional square cavity fully filled with a homogeneous porous medium is numerically studied by the lattice Boltzmann method. In this physical model, the upper wall of porous cavity is set to be a cold heat source, and the bottom wall is designed as a local hot heat source. Both the left wall and the right wall are set to be adibatic. Specifically, the effects of both the position and size of bottom heat source on the properties of natural convective heat transfer are analyzed. The numerical results show that the position and size of bottom heat source have great influences on the characteristics of natural convective heat transfer, and there also exist the best position (a=4/16) and optimal size (b=0.75) of the bottom heat source for the maximal convective heat transfer intensity (Numax 10.35) and heat exchange capacity (Qmax 5.69).
Keywords: natural convective heat transfer/
porous medium/
lattice Boltzmann method
