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结合高速摄像和电容层析成像技术,对脉动热管进行了可视化测量研究.从流型和流向两方面分析了脉动热管的运行机理和传热特性.根据受力分析对脉动热管的结构进行了改进.结果表明:脉动热管存在3种不同流型,即塞状流、环状流以及两者共存的混合流,其对应的影响因素、运行特性与传热强度也不同;从流动方向来看,脉动热管内工质的流动可分为脉动流和循环流;对脉动热管的改进说明改变脉动热管流道的对称性和均衡性有利于循环流的形成和维持.
Combined with high-speed imaging and capacitive tomography, the pulsating heat pipe was visualized and measured.The operating mechanism and heat transfer characteristics of the pulsating heat pipe were analyzed from the aspects of flow pattern and flow direction.According to the stress analysis, the structure of the pulsating heat pipe was improved The results show that there are three different flow patterns in the pulsating heat pipe, that is, the plug flow, the annular flow and the coexistence of the two flow, the corresponding influencing factors, operating characteristics and heat transfer intensity are also different from the flow direction; The flow of working fluid in pulsating heat pipe can be divided into pulsating flow and circulating flow. The improvement of pulsating heat pipe shows that changing the symmetry and balance of pulsating heat pipe flow is conducive to the formation and maintenance of circulating flow.