稳定振荡条件下高性能脉动热管工作特性研究

Study on Operating Characteristic of High Performance Oscillating Heat Pipe Under Steady Oscillating Conditions

电子设备小型化与高性能化的趋势给现有的热管理系统带来了巨大的挑战。脉动热管作为热管理系统具有性能优越,高自由度的优势。本文研究了将稳定振荡运行的脉动热管作为核心部件用于电子设备热管理领域的微观作用机理和性能变化。研究发现,脉动热管在稳定振荡阶段运行可以有效避免停滞现象从而实现最佳的热性能。通过对稳定振荡条件下脉动热管的工作特性进行可视化研究发现,该阶段的支配流型为柱塞流或弹状流。作为主要特征的泰勒气泡其位移趋向于正弦运动,而速度分布主要为往复流特征,平均速度接近于0,在高热流密度条件下,速度分布的往复流特征被打破并出现脉动流特征,冷却效率小幅提高。

High performance and miniaturization of electronic equipment has brought great challenges to existing thermal management systems.have become crucial in the development of electronic equipment,which requires light weight,highly-efficient heat dissipation components.Oscillating heat pipes(OHPs)are promising thermal management device owing to their excellent heat transfer capability and high flexibility.This study focuses on the operating characteristic and thermal performance of an OHP operated under steady oscillating conditions in a hybrid thermal management system.It is found that the stopover phenomenon can be reduced and the best thermal performance can be achieved for an OHP operated under steady oscillating conditions.The visualization results indicate that the reciprocating-type velocity distribution is the most typical distribution for an OHP operated under steady oscillating conditions.The average temperature is close to 0.At a high heat flux,the reciprocating flow distribution are broken and oscillating flow appear,then the cooling efficiency is slightly improved.