Numerical Study on the Mechanism of Heat Transfer Enhancement of Tandem Cylinders in Unsteady Flow
Unsteady flow and heat transfer characteristics were numerically studied for tandem cylinders. The numerical scheme used in this study was validated in the previous study. It was found that the heat transfer performance of the tandem cylinders was noticeably affected by the center distance of the cylinders and the mean heat transfer performances got the maximum value at lw=4D for the first cylinder and lw=6D for the second cylinder at the case of Re=200. The reason of the heat transfer enhancement for the second cylinder at a large central distance was deeply connected with the vorticity motion of the wake of the first cylinder. When a clockwise flow motion with cold fluid due to vorticity approached to the upper surface of the second cylinder, the heat transfer there was enhanced. And when a counter-clockwise flow motion with the hot fluid due to vorticity approached to the upper surface of the second cylinder, the heat transfer there was deteriorated.
Transition flow Vortex shedding Compound grid system Tandem cylinders Heat transfer performance
Shaodong Zhou Zhou Zhao Shifeng Yan Yinnan Yuan Guannan Xi
School of Mechanical Engineering, Nantong University, Nantong, 226019, China
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-5
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）