Vortex distribution and mixed convection of liquid flow across micro-cylinders in a rectangular channel

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• 作者：Ning Guan ; Tao Luan ; Zhi-Gang Liu ; Cheng-Wu Zhang ; Guilin Jiang
• 刊名：Heat and Mass Transfer
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：52
• 期：3
• 页码：657-670
• 全文大小：3,028 KB
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• 作者单位：Ning Guan (1)
  Tao Luan (1)
  Zhi-Gang Liu (2)
  Cheng-Wu Zhang (2)
  Guilin Jiang (2)
  
  1. School of Energy and Power Engineering, Shandong University, Jinan, 250061, Shandong, China
  2. Energy Research Institute of Shandong Academy of Sciences, Jinan, 250014, Shandong, China
  
• 刊物类别：Engineering
• 刊物主题：Engineering Thermodynamics and Transport Phenomena
  Industrial Chemistry and Chemical Engineering
  Thermodynamics
  Physics and Applied Physics in Engineering
  Theoretical and Applied Mechanics
  Engineering Fluid Dynamics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1181

文摘

The impacts of heat flux (q = 10, 15, 20 W/cm2), cylinder diameter (D = 300, 600, 3000 μm), aspect ratio AR (H/D = 1, 2, 4) and block ratio BR (W/D = 2, 4, 16) on vortex distribution and mixed convection of liquid flow across single micro-cylinder and micro-cylinder-groups (3 × 3 cylinders) were numerically investigated. The separation angles, recirculation lengths (Lv) and Nusselt numbers were calculated with Reynolds number ranging from 10 to 60. For the single micro-cylinder, the separation angle and the value of Lv/D both became large with the increase of heat flux, and the profiles of Lv/D versus z/H were asymmetrical, which is different from the cylinders with dimensions of millimeter-level. The discrepancies of Lv/D on the same plane of micro-cylinders with different AR in the region near end-walls were larger than those near the symmetry wall. For the 3 × 3 micro-cylinder-groups, the value of Lv/D was related to the location along the axial direction, while the separation angle became small along the flowing direction. The mixed heat transfer in rectangular channel with micro-cylinders could be enhanced by changing the dimensions of the cylinders and the channel.