Numerical Simulation Research on Heat Transfer and Flow Characteristics of Spiral Curled Fins
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摘要: 为了深入了解螺旋卷曲翅片换热器的对流换热能力，通过数值模拟的方法，从传热流动和换热器的紧凑性两个方面对螺旋卷曲翅片换热器在空气中的对流换热特性进行研究。分别研究了无量纲管间距（T/D）、无量纲翅片高度（H/D）和无量纲翅片间距（S/D）对螺旋卷曲翅片传热流动特性的影响。研究结果表明：较小的T/D会增加翅片管束的流动能力，从而增加对流传热；随着H/D的增加，螺旋卷曲翅片管束的换热面积增加，总换热量升高，但散热不够充分，影响螺旋卷曲翅片的效率；当S/D较大时，螺旋卷曲翅片的紧凑性下降，管束的阻力降低，平均体积传热密度也有所降低。本文的研究结果得出了不同参数对螺旋卷曲翅片传热与流动特性的影响规律，对螺旋卷曲翅片的设计具有很好的指导意义。Abstract: In order to gain a deeper understanding of the convective heat transfer capability of spiral curled fin heat exchanger, this paper conducts a study on the convective heat transfer characteristics of spiral curled fin heat exchanger in air from two aspects: heat transfer flow and the compactness of the heat exchanger, using numerical simulation methods. The effects of dimensionless tube spacing (T/D), dimensionless fin height (H/D), and dimensionless fin spacing (S/D) on the heat transfer and flow characteristics of spiral curled fins were studied. The research results indicate that a smaller T/D will increase the flow capacity of the finned tube bundle, thereby increasing convective heat transfer. With the increase of H/D, the heat transfer area of the spiral curled fin tube bundle increases, and the total heat transfer increases. However, the heat dissipation is not sufficient, which affects the efficiency of the spiral curled fins. When the S/D is large, the compactness of the spiral curled fins decreases, the resistance of the tube bundle decreases, and the average volume heat transfer density also decreases. The research results of this article have obtained the influence of different parameters on the heat transfer and flow characteristics of spiral curled fins, which has good guiding significance for the design of spiral curled fins.
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Key words:
- Spiral curled fins /
- Heat exchanger /
- Heat transfer and flow /
- Numerical simulation
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图 1 螺旋卷曲翅片换热器的示意图和计算域
d—翅片管外径；D—翅片管内径；Ts—纵向管间距；tf—翅片厚度；c—翅根宽度；L1—进口段长度；L2—出口段长度
Figure 1. Schematic Diagram and Computational Domain of Spiral Curled Fin Heat Exchanger
图 3 T/D对螺旋卷曲翅片传热性能的影响
Figure 3. Effect of T/D on Heat Transfer Performance of Spiral Curled Fins
图 4 不同T/D下$ \overline {Nu} $与$ {{\Delta }}P $变化
Figure 4. $ \overline {Nu} $ and $ {{\Delta }}P $ Variation at Different T/D
图 5 不同T/D下$ {\eta _{\text{f}}} $与$ \bar q $变化
Figure 5. $ {\eta _{\text{f}}} $and $ \bar q $Variation at Different T/D
图 6 H/D对螺旋卷曲翅片传热特性的影响
Figure 6. Effect of H/D on Heat Transfer Performance of Spiral Curled Fins
图 7 不同H/D下$ \overline {Nu} $与ΔP变化
Figure 7. $ \overline {Nu} $and $ {{\Delta }}P $ Variation at Different H/D
图 8 不同H/D下$ {\eta _{\text{f}}} $与$ \bar q $变化
Figure 8. $ {\eta _{\text{f}}} $and $ \bar q $Variation at Different H/D
图 9 S/D对螺旋卷曲翅片传热特性的影响
Figure 9. Effect of S/D on Heat Transfer Performance of Spiral Curled Fins
图 10 不同S/D下$ \overline {Nu} $与$ {{\Delta }}P $变化
Figure 10. $ \overline {Nu} $ and $ {{\Delta }}P $ Variation at Different S/D
图 11 不同S/D下$ {\eta _{\text{f}}} $与$ \bar q $变化
Figure 11. $ {\eta _{\text{f}}} $and $ \bar q $Variation at Different S/D
表 1 螺旋卷曲翅片换热器的尺寸
Table 1. Dimensions of Spiral Curled Fin Heat Exchanger
参数 参数值 d/mm 20 H/mm 12~16 T/mm 33~49 S/mm 2~6 Ts/mm 37 tf/mm 0.5 c/mm 2 L1 2d L2 3d 
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