单侧内肋阵微通道复合热沉构形优化设计及遗传算法比较分析北大核心CSCD

[目的]旨在通过构形优化设计提高电子设备的热管理技术水平。[方法]在约束肋片体积占比和相对位置的条件下,建立微通道复合热沉的三维流动和传热数值模型,以热沉固体区域温度梯度均匀性因子最小化为目标,分别采用穷举法和遗传算法对肋片高宽比h/w及肋片间距ε进行构形优化设计。[结果]结果显示,采用穷举法和遗传算法均能得到热沉固体区域温度梯度均匀性因子的最小值以及对应的最优构形,且温度梯度均匀性相比无肋微通道热沉,最高可提高13.30%;采用穷举法和10种配置遗传算法方案所得目标函数最小值之间的误差最大不超过0.92%。[结论]所做研究可为电子设备散热器的研发提供新的优化设计结果。     

Constructal design of tree-shaped microchannel disc heat sink with wavy walls北大核心CSCD

［Objective］To meet the efficient thermal management needs of electronic devices such as ships and underwater vehicles, this study focuses on the constructal design of a tree-shaped microchannel disc heat sink with wavy walls. ［Method］A design prototype of the heat sink with wavy walls is first proposed. Based on constructal theory, the amplitude and wavelength of the wavy walls are designed under the constraints of fixed heat sink volume and fixed microchannel volume by maximizing the comprehensive performance evaluation criteria (PEC) while considering both heat transfer and flow pressure drop. ［Results］The results show that the wavy walls increase the heat transfer surface areas and generate vortices in their cavities, effectively reducing the maximum temperature. When the inlet Reynolds number is fixed at 700, 900 or 1100 respectively, the maximum temperature is reduced by 13.5 K by increasing the amplitude of the wavy walls, while the pressure drop increases significantly; and the maximum temperature is reduced by 4.7 K by reducing the wavelength of the wavy walls, while the pressure drop increases slightly. There are optimal amplitudes that raise the comprehensive performance evaluation criteria to extreme values for given larger wavelengths, while the comprehensive performance evaluation criteria increase monotonously as the amplitude increases for given smaller wavelengths. ［Conclusion］Wavy walls can significantly improve the thermal performance of tree-shaped microchannel disc heat sinks, and the use of constructal design can realize optimal geometric constructs with optimal comprehensive performance evaluation criteria. © 2023 Authors. All rights reserved.