东北大学学报(自然科学版) ›› 2025, Vol. 46 ›› Issue (2): 42-49.DOI: 10.12068/j.issn.1005-3026.2025.20230264

• 材料与冶金 • 上一篇    下一篇

柔性柱初始倾角对微通道传热增强的影响

于珂凡1, 赵亮1, 董辉1(), 何永清2   

  1. 1.东北大学 冶金学院,辽宁 沈阳 110819
    2.重庆工商大学 微纳系统与智能传感重庆市重点实验室,重庆 400067
  • 收稿日期:2023-09-08 出版日期:2025-02-15 发布日期:2025-05-20
  • 通讯作者: 董辉
  • 作者简介:于珂凡(1998—),女,辽宁大连人,东北大学硕士研究生
    董 辉(1969—),男,辽宁黑山人,东北大学教授,博士生导师.
  • 基金资助:
    国家自然科学基金资助项目(52176067);河北省杰出青年科学基金资助项目(E2022202139);河北省自然科学基金资助项目(E2021202163)

Effect of Initial Inclination Angle of Elastic Pillars on Heat Transfer Enhancement in Microchannel

Ke-fan YU1, Liang ZHAO1, Hui DONG1(), Yong-qing HE2   

  1. 1.School of Metallurgy,Northeastern University,Shenyang 110819,China
    2.Chongqing Key Laboratory of Micro Nano Systems and Intelligent Sensing,Chongqing Technology and Business University,Chongqing 400067,China
  • Received:2023-09-08 Online:2025-02-15 Published:2025-05-20
  • Contact: Hui DONG

摘要:

为解决电子器件的散热问题,对具有不同初始倾角的柔性柱微通道内的流动与传热特性进行了数值研究.此外,还探讨了柔性柱的动态特性和倾角对流体传热性能、水动力摩擦系数和总水热效率的影响.结果表明,柔性柱倾角为0.2π时,产生1.25 μm的小振幅,不利于涡流的产生,而在完全扑动模式下的柔性柱可以产生周期性涡流,更有利于边界层的扰动和冷热流体的混合,从而强化传热.在雷诺数Re为800 ~ 1 200的范围内,柔性柱存在最佳的倾角0.6π,在最佳工况下,以较高的机械损失为代价,可以使流体传热性能(Nutot)提高63.5%,总水热效率(η)提高7.5%.

关键词: 强化传热, 柔性涡发生器, 微通道, 任意拉格朗日-欧拉法, 数值模拟

Abstract:

To solve the heat dissipation problem of electronic devices, the flow and heat transfer features of elastic pillar with different initial inclinations in microchannel are numerically investigated. Furthermore, the influences of dynamic characteristics and inclination angle of the elastic pillar on fluid heat transfer performance, hydrodynamic friction factor, and overall hydrothermal efficiency are probed. The results indicate that 1.25 μm oscillation is generated when the inclination angle of the elastic pillar is 0.2π. This small amplitude is not conducive to the generation of vortices. On the other hand, an elastic pillar in a fully flapping mode can generate periodic vortices, which is more conducive to the disturbance to the boundary layer and the mixing of cold and hot fluids, thereby enhancing heat transfer. In the range of Re from 800 to 1 200, the elastic pillar has the optimal inclination angle of 0.6π. Under the optimum working condition, at the expense of high mechanical loss, the heat transfer performance of the fluid can be improved by 63.5%, and the total hydrothermal efficiency can be increased by 7.5%.

Key words: heat transfer enhancement, flexible vortex generator, microchannel, arbitrary Lagrangian-Eulerian (ALE) method, numerical simulation

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