矩形翅片椭圆换热管束性能

采用标准k ε模型，就管排数和翅片间距等因素对矩形翅片椭圆换热管束流动换热性能的影响进行分析.得到管束各排翅片表面平均换热系数分布规律，并给出j因子和f因子与管排数的关系.结果表明：翅片间距主要通过阻力对管束性能产生影响，当翅片间距小于2.5 mm时，管束空气侧阻力对风速的敏感性显著增加；可以通过采用高导热系数翅片材料的方法来提升管束性能.
A standard k ε model was used to analyze the effect of row number and fin pitch on the flow and heat transfer performance of heat exchanger. The average heat transfer coefficients of each row of fin was given, and also the relationship between row number and j, f factors. It is found that the fin pitch is mainly related to air side pressure loss, and when the fin pitch is smaller than 2.5 mm, the air side pressure drop will be more sensitive to air velocity. The comprehensive performance of heat exchanger could be improved through the use of high thermal conductivity material in fins