通过三维层流数值模拟,与平片计算结果对比,设计了适用于低流速和Re数(迎面风速1～3 m/s,对应Re数901～2702)下的空调蒸发器用管翅式换热器的开缝翅片形式.研究表明:在上述迎面风速和Re数范围内,开缝翅片性能曲线和平片性能曲线不可避免地有一个交叉点,对应Re数称为转折Re数,在交叉点前的速度和Re数范围内,平片换热器的综合性能优于开缝翅片,而在高于转折Re数后,随着迎面风速的增大,开缝翅片的综合换热性能将越来越优于平片;依据"前疏后密"原则适当减少开缝翅片换热器开缝的条数,可以有效降低转折Re数,并显著改善低流速和Re数下换热器的综合性能.另外,再次验证了场协同理论-温度场和速度场的协同性与换热器换热量间的必然联系.
参考文献
| [1] | H C Kang;M H Kim .Effect of Strip Location on the Air-Side Pressure Drop and Heat Transfer in Strip Finand-Tube Heat Exchanger[J].International Journal of Refrigeration-Revue Internationale du Froid,1998,22(02):302-312. |
| [2] | Jeom-Yul Yun;Kwan-Soo Lee .Influence of design parameters on the heat transfer and flow friction characteristics of the heat exchanger with slit fins[J].International Journal of Heat and Mass Transfer,2000(14):2529-2539. |
| [3] | Z. G. Qu;W. Q. Tao;Y. L. He .Three-Dimensional Numerical Simulation on Laminar Heat Transfer and Fluid Flow Characteristics of Strip Fin Surface With X-Arrangement of Strips[J].Journal of heat transfer: Transactions of the ASME,2004(5):697-707. |
| [4] | Cheng YP;Qu ZG;Tao WQ;He YL .Numerical design of efficient slotted fin surface based on the field synergy principle[J].Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology,2004(6):517-538. |
| [5] | 陶文铨.数值传热学[M].西安:西安交通大学出版社,2001 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%