带有周期性微结构的微通道传热性能研究
Research on Heat Transfer Performance of Microchannel with Periodic Microstructures
倪浪 1向立平 2郭俊飞 1卿德藩1
作者信息
- 1. 南华大学 机械工程学院,湖南 衡阳 421001
- 2. 南华大学 核科学技术学院,湖南 衡阳 421001
- 折叠
摘要
为增强微通道热沉的散热性能,文章设计了一种带有周期性微结构的微通道,周期性微结构由通道中间的针肋与两侧的凹穴组成.采用数值模拟方法研究了不同结构形式与排布方式微结构对微通道传热性能的影响,利用强化传热因子评价其综合性能.结果表明,在所有微通道中,六边形肋交错渐密排布微通道展现出最佳的热性能和综合性能,相较于矩形微通道,在雷诺数为 716.8 时,其底面最高温度下降约 25.46 K,热阻下降约 54%,平均努塞尔数增大约 45%,强化传热因子达 1.503.
Abstract
In order to enhance the heat dissipation performance of microchannel heat sink,a microchannel with periodic microstructure is designed in this paper.The periodic microstructure is composed of needle ribs in the middle of the channel and cavities on both sides.The influence of microstructure with different structure and arrangement on the heat transfer performance of microchannels is studied by numerical simulation,and the comprehensive performance is evaluated by the enhanced heat transfer factor.The results show that among all microchannels,the microchannel with hexagonal ribs staggered and densely arranged exhibits the best thermal performance and comprehensive performance.Compared with the rectangular microchannel,when the Reynolds number is 716.8,the maximum temperature of the bottom surface decreases by about 25.46 K,the thermal resistance decreases by about 54%,the average Nusselt number increases by about 45%,and the enhanced heat transfer factor reaches 1.503.
关键词
微通道/周期性微结构/数值模拟/强化传热Key words
microchannel/periodic microstructure/numerical simulation/enhanced heat transfer引用本文复制引用
基金项目
湖南省教育厅科学研究重点项目(20A429)
出版年
2024
NETL
NSTL
万方数据