脉动热管的流型及流向分析  

An Analysis of Flow Patterns and Directions of a Pulsating Heat Pipe

作　　者：李惊涛[1] 李志宏[1] 韩振兴[1] 刘石[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《热能动力工程》2009年第3期347-351,共5页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然基金重点项目(50736002);长江学者和创新团队发展计划基金资助项目(IRT0720)

摘　　要：通过3种不同结构脉动热管的可视化实验,研究管内工质的流型和流向。运用实验研究的方法,加宽充液率和热负荷的变化范围,观察并分析不同流型的变化特征;另外,设计出有利于实现工质稳定循环流动的两种改进型脉动热管。实验结果表明:不同工作条件下脉动热管内会出现塞状流、混合流和环状流等不同流型,流型具有自适应传热量变化的特性;改变脉动热管流道的对称性和均衡性,以及毛细渐扩管道汽泡的微泵效应,有利于实现工质的稳定单向循环流动。Through visual tests of three types of pulsating heat pipe with different structures,the flow patterns and directions of the working medium in the heat pipe were studied.The variation range of the liquid filling rate and heat load was widened by employing an experimental study method with the change characteristics of different flow patterns being observed and analyzed.In addition,two types of improved pulsating heat pipe,favorable for securing a stable circulating flow of the working medium,were designed.The test results indicate that various flow patterns may occur in the pulsating heat pipe under different working conditions,namely,plug flow-,hybrid flow-and annular flow pattern,etc.The flow patterns feature self-adjusting characteristics to any change of heat transferred.To modify the symmetry and equilibrium of the flow passage of the pulsating heat pipe as well as the micro-pump effect of bubbles in the capillary diverging passage will be beneficial to attaining a stable single-direction circulating flow of the working medium.

关 键 词：脉动热管 流型 流向 结构改进 

分 类 号：TK124[动力工程及工程热物理—工程热物理]