Analysis of Convective Heat Transfer Characteristics and Entropy Generation of Fluid in Fish-scale Bionic Enhanced Heat Transfer Tubes
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摘要: 随着仿生学的发展，仿生技术具有较好的减阻、传热效果。受自然界鱼鳞启发，本文提出了3类仿生强化传热管，通过数值模拟研究了湍流状态下（雷诺数Re在15700~62900范围内）仿生强化传热管不同深度、间距和角度对管内流体流动传热特性的影响。结果表明，3类仿生强化传热管均具有良好的强化传热效果，深度越大、间距越小、角度越小，则强化传热效果越好。相同条件下，对仿生强化传热管综合性能和熵产进行分析发现，类型2仿生强化传热管的综合性能最优，其评价准则数（PEC）最大，功率损失最小。
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关键词:
- 鱼鳞仿生 /
- 评价准则数（PEC） /
- 熵产 /
- 强化传热
Abstract: With the development of bionics, bionic technology has better drag reduction and heat transfer effects. Inspired by the fish-scale bionic concept, three biomimetic enhanced heat transfer tubes are proposed. The effects of different depths, spacings and angles of bionic enhanced heat transfer tubes on the fluid flow and heat transfer characteristics in the turbulent flow regime (Re=15700−62900) are studied by numerical simulation. The results show that the three bionic enhanced heat transfer tubes all have perfect heat transfer enhancement effect. The greater the depth, the smaller the spacing and the smaller the angle, the better heat transfer enhancement effect. Under the same conditions, the comprehensive performance and entropy generation of bionic enhanced heat transfer tubes are analyzed, and it is found that the second type has the best comprehensive performance, the largest performance evaluation criteria (PEC) and the smallest power loss. -
图 3 类型1仿生强化传热管的横截面网格
Figure 3. Mesh Grid Cut Plane of Type 1 Bionic Enhanced Heat Transfer Tube
图 6 不同类型仿生强化传热管传热的变化
Figure 6. Variation of Heat Transfer in Different Bionic Enhanced Heat Transfer Tube Types
图 7 不同类型仿生强化传热管流动阻力的变化
Figure 7. Variation of Flow Resistance in Different Bionic Enhanced Heat Transfer Tube Types
图 8 不同类型仿生强化传热管PEC随Re的变化
Figure 8. Variation of PEC with Re in Different Bionic Enhanced Heat Transfer Tube Types
图 9 不同类型仿生强化传热管St/S0、Sf/S0、S/S0随Re的变化
Figure 9. Variation of St/S0, Sf/S0 and S/S0 with Re in Different Bionic Enhanced Heat Transfer Tube Types
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