椭圆管翅式换热器的翅片效率工程上通常是将其转换为圆形翅片管来计算.当量圆管的选取方法有两种,一种是使当量圆管的横截面积与椭圆管横截面积相同,另一种是使当量圆管的周长与椭圆管的周长相同.本文利用扇形法计算了长短轴比范围为1～5的椭圆管直翅换热器在不同工况下的翅片效率,并与工程上常用的等周长和等面积法的计算结果进行了比较.与扇形法计算的效率相比,等周长法的结果偏高,等面积法的结果偏低.
参考文献
| [1] | Jiin-Yuh Jang;Jyh-Yau Yang .Experimental and 3-D numerical analysis of the thermal-hydraulic characteristics of elliptic finned-tube heat exchangers[J].Heat Transfer Engineering,1998(4):55-67. |
| [2] | Min J C;Webb R L;Peng X F.Numerical Investigation of Effect of Tube Shape on Air-side Heat Transfer and Pressure Drop Characteristics of a Finned Tube Heat Exchanger. Heat Transfer Science and Technology[M].北京:高等教育出版社,2000:719-724. |
| [3] | Schmidt Th E .Heat Transfer Calculations for Extended Surfaces[J].Refrigerating Engineering,1949,49:351-357. |
| [4] | Shah R K.Plate-Fin and Tube-Fin Heat Transfer Design Procedures. Heat Transfer Equipment Design, Washington D C[M].USA:Hemisphere Publishing Corp,1988:255-266. |
| [5] | Min J C;Webb R L.Numerical Predictions of Wavy Fin Coil Performance[M].Journal of Enhanced Heat Transfer in Press |
| [6] | Wang C C;Fu W L;Chang C T .Heat Transfer and Friction Characteristics of Typical Wavy Fin-and Tube Heat Exchangers[J].Experimental Thermal and Fluid Science,1997,14(02):174-186. |
| [7] | K. Hong;R. L. Webb .Performance of dehumidifying heat exchangers with and without wetting coatings[J].Journal of heat transfer: Transactions of the ASME,1999(4):1018-1026. |
| [8] | Kang H C;Webb R L .Evaluation of the Wavy Fin Geometry Used in Air-cooled Finned-Tube Heat Exchangers.In: Proceedings of the 11th International Heat Transfer Conference[J].Kyongju Korea,1998,6:95-100. |
| [9] | Kang H C;Webb R L.Performance Test of Round and Oval Tube Coils Using a Scaled-Up Model. [Internal Technique Report][M].USA:Pennsylvania State University,1997 |
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