Flow and Heat Transfer Characteristics of a Channel with Cut Fins
Flow and Heat Transfer Characteristics of a Channel with Cut Fins
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带有切割翅片的通道的流动和传热特性
DOI：
10.1615/jenhheattransf.v17.i2.40
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
K. Nakabe
中科院分区：
文献类型：
--
作者：
K. Tatsumi;Mitsuhiro Yamaguchi;Y. Nishio;K. Nakabe
为了加强流体的混合和换热，同时降低压力损失损失，在平行的翅片阵列上应用了方形凹槽。对底部安装有切翅片的矩形通道进行了三维数值模拟、速度测量和换热实验，研究了层流条件下缺口尺寸和翼片间距对翅片性能的影响。在切割翅片情况下，虽然换热面积减小，但换热性能与无缺口平翅片相当。由于翅片侧壁的换热系数与扩展的换热面积之间存在权衡问题，因此缺口尺寸对整体换热性能影响不大。在这种情况下，摩擦损失也得到了降低，表明总体性能有所提高。找到了使翅片热阻最小的翅片节距的最佳值，且切割翅片的值小于切翅片的值。
Square shape notches were applied to a parallel fin array, referred to as "cut-fin", for the purpose of enhancing the fluid mixing and heat transfer, and also reducing the pressure loss penalty. Threedimensional numerical simulation, velocity measurement and heat transfer experiment were carried out for a rectangular channel with cut-fins mounted on the bottom wall, and the notch size and spanwise fin pitch effects on the fin performances were evaluated under laminar flow condition. In the cut-fin case, although the heat transfer area was reduced, a comparable heat transfer performance to the notch-less plain-fin case was obtained. The notch size did not largely affect the overall heat transfer performance due to the trade-off problem between the heat transfer coefficient at fin sidewalls and the extended heat transfer area. Reduction of the friction loss was also achieved in this case, indicating an increase of the total performance. An optimum value of the fin pitch in minimizing the fin thermal resistance was found and the value of the cut-fin case was smaller than that of the