Freeform winglet design of fin-and-tube heat exchangers guided by topology optimization
Freeform winglet design of fin-and-tube heat exchangers guided by topology optimization
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DOI：
10.1016/j.applthermaleng.2019.114020
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发表时间：
2019-10
影响因子：
6.4
通讯作者：
Hiroki Kobayashi;K. Yaji;S. Yamasaki;K. Fujita
中科院分区：
文献类型：
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作者：
Hiroki Kobayashi;K. Yaji;S. Yamasaki;K. Fujita
本文提出了一种新型的翅片管换热器小翼设计，并对其强化传热性能进行了数值研究。在这项研究中，鳍图案的设计考虑的形状，安排，和数量的小翼，因为更高的自由度的结构设计的结果，在进一步改善的性能。为了获得有前途的功能的小翼设计，拓扑优化应用在一个简化的模型，结合物理现象的关键因素。在低雷诺数流动条件下，将优化问题转化为二维简化模型中小翼散热量的最大化问题。通过三维高保真度分析，以获得一个有前途的设计候选人的优化配置进行评估。然后根据有希望的候选者设计可制造的鳍片图案。结果表明，在压力损失较小的情况下，沿流动方向沿着逐渐弯曲的小翼可以起到强化换热的作用。所提出的鳍演示了高达16.0%的改善品质因数j/f相比，鳍与矩形小翼对。
This paper presents a novel winglet design of a fin-and-tube heat exchanger, and its performance regarding heat transfer enhancement is numerically investigated. In this study, the fin pattern is designed considering the shape, arrangement, and number of the winglets, because a higher degree of freedom for the structural design results in further improvement of the performance. To obtain promising features for the winglet design, topology optimization is applied in a simplified model that incorporates key factors of the physical phenomena. The optimization problem is formulated as a maximization problem of the heat extraction by the winglets in a two-dimensional simplified model under lowered Reynolds number flows. The optimized configurations are evaluated via three-dimensional high-fidelity analyses to obtain a promising design candidate. A manufacturable fin pattern is then designed from the promising candidate. The results indicate that the gradually curved winglets along the flow can enhance the heat transfer at a moderate pressure loss. The proposed fin demonstrates up to 16.0% improvement in the quality factor j/f compared with a fin with rectangular winglet pairs.