| 摘要: |
| 研究了一种水平矩形翅片开圆形孔时对自然对流换热的强化作用。通过实验和模拟比较了实心翅片和开不同孔数翅片的散热功率。除开孔数外，还考虑了翅片开孔的位置、开孔大小和开孔形状对传热强化的影响。结果表明：开孔翅片要优于实心翅片，并且随着翅片开孔数的增加，翅片的散热功率先增大后减小，当开孔数为7时最优，其散热功率与实心翅片相比，增加了13.25%。开孔的位置在底部时，翅片的散热效果最好，中间次之，顶部最差。同时在研究范围之内，翅片的散热功率随开孔半径的增大先增加后减小。开孔半径为7mm时，翅片的散热效果最好，与实心翅片相比，其散热功率增加了27.14%。此外，还比较了同等面积的三角孔、方孔和圆孔对翅片散热的影响，其中开圆孔的散热效果最好。 |
| 关键词: 工程热物理 自然对流 矩形翅片 开孔 强化传热 辐射 |
| DOI： |
| 投稿时间：2011-10-02
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| 基金项目: |
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| Enhancement of Natural Convection Heat Transfer from a Fin by Circular Perforations |
| Jing Wenjuan,Jian Shizhao,Yin Shugui,Wei Xinli |
| (School of Chemical and Energy Engineering, Zhengzhou University) |
| Abstract: |
| Heat transfer enhancement from a horizontal rectangular fin embedded with circular perforations under natural convection is studied. Through the experiment and simulation, the heat dissipation power of different perforated numbers was compared to the equivalent solid one. Despite the perforated number, the perforated location, size and shape were also considered in heat transfer enhancement. It is shown that the perforated fin is superior to the solid. And with the increase in the number of perforation, the heat dissipation power increases first and then decreases. There is an optimal perforated number 7. Its heat dissipation power increases by 13.25% comparing with the corresponding solid fin. When the perforated location is at the bottom, the heat dissipation power is the best. Then the middle is the second and the top is the worst. Within the scope of the study, with the increase of perforated radius, the heat dissipation power increases first and then decreases. When the perforated radius is 7mm, the heat dissipation is the biggest. Its heat dissipation power increases by 13.25% comparing with the corresponding solid fin. And comparison of the triangular, square and circular perforations with the same areas, the heat dissipation of the circular perforations is the best. |
| Key words: engineering thermophysics natural convection rectangular fin perforation heat transfer enhancement radiation |
