压电风扇嵌入式冷却系统流场及换热特性研究  

Investigation on the Flow Field and Heat Transfer Characteristics of a Piezoelectric Fan Embedded Cooling System

作　　者：周尧[1] 田沣[1] 张丰华[1] 董进喜[1] 郭鹏 ZHOU Yao;TIAN Feng;ZHANG Fenghua;DONG Jinxi;GUO PENG(China Aeronautical Computing Technique Research Institute,Xi’an 710119,China)

机构地区：[1]西安航空计算技术研究所,陕西西安710119

出　　处：《压电与声光》2018年第2期309-312,共4页Piezoelectrics & Acoustooptics

基　　金：航空科学基金资助项目(2016ZC31003)

摘　　要：提出一种压电风扇嵌入式冷却系统,并对其进行了数值模拟和试验研究,分析了压电风扇诱导非定常流场流动特性及强化换热性能,研究了外部供风风速、翅间距对流场和换热性能的影响。研究表明,由于压电风扇的挤压、扰动及涡旋的作用,翅片壁面原本稳定的热边界层被破坏,流体的混合和热交换作用增强,温度梯度减小,因而翅片与空气间的热阻降低。结果表明,翅间距为18mm时,该文中压电风扇散热效果最佳。A piezoelectric fan embedded in a fin heat sink is proposed and the numerical simulation and experimental investigation are carried out in this paper.The characteristics of the unsteady flow field induced by the piezoelectric fan and the enhanced heat transfer performance were analyzed.The influences of external air-supply velocity and fin pitch on the flow field and heat transfer performance are studied.The results indicate that,because of the extrusion,disturbance of the piezoelectric fan and the presence of vortexes,the thermal boundary layers of the fin surface are disrupted,the fluid mixing and heat transfer is enhanced,and the temperature gradient of the fluid decreased,thereby the fin-to-air heat transfer resistance decreased significantly.When the fin pitch is 18 mm,the piezoelectric fan presented in this paper has the best heat dissipation effect.

关 键 词：压电风扇 数值模拟 流动特性 强化换热 热边界层 

分 类 号：TN712.5[电子电信—电路与系统]