LBE simulation of coherent vortex motion and heat transfer in jets of cross flow |
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| Authors: | Nan Gui Wenkai Xu Liang Ge Jianren Fan |
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| Institution: | 1. Department of Thermal Energy Engineering, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, P.R. Chinazjuguinan@zju.edu.cn;3. Department of Thermal Energy Engineering, College of Mechanical and Transportation Engineering, China University of Petroleum, Beijing, P.R. China;4. State Key Laboratory of?Clean Energy Utilization, Department of Energy Engineering, Zhejiang University, Hangzhou, P.R. China |
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| Abstract: | Lattice Boltzmann equation method is used to simulate the coherent vortex motions and interactions and the heat transfer characteristics of jets in cross flow (JICFs) via TD2G9 model. After validation, the characteristics of cross flow under different Reynolds numbers are illustrated, including the mean profiles, the Reynolds stress tensor, the vortex and temperature fields, the temperature gradients near the walls, and the coherent correlation of vortex motions. The results show that the velocity profiles in JICF can be characterized by three basic regions, which are mainly caused by the mergence of JICF with the main flow. The temperature gradient near the walls can also be categorized by four basic regions, which are caused mainly by the impulse of JICFs too. Coherent vortex motions are found in JICF for Re = 3000, which are proved by strong periodic correlation of flow variables over a fixed area. |
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| Keywords: | cross flow jet coherent structure heat transfer lattice Boltzmann equation |
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