Investigation on the temperature dependence of filling ratio in cryogenic pulsating heat pipes
Investigation on the temperature dependence of filling ratio in cryogenic pulsating heat pipes
复制标题
低温脉动热管填充率随温度变化的研究
DOI：
10.1016/j.ijheatmasstransfer.2018.05.147
复制
发表时间：
2018
影响因子：
5.2
通讯作者：
Gan Zhihua
中科院分区：
文献类型：
--
作者：
Sun Xiao;Pfotenhauer John;Jiao Bo;Fonseca Luis Diego;Han Dongyang;Gan Zhihua
The pulsating heat pipe (PHP) is an efficient two-phase heat transfer device. Its heat transfer performance and internal working fluid flow patterns are affected by a variety of parameters. The filling ratio (FR) is one of the most important parameters, and it is usually regarded as a temperature-independent constant during the operation of the PHP. In this study, the fact that the FR is temperature dependent is pointed out, recognizing that the specific volumes of the liquid working fluid and vapor working fluid change with temperature. FR lines on aT-vdiagram are used to analyze the trend of the FR with temperature. Also the influence of the variation of the FR on the heat transfer performance is discussed with the experimental data obtained from a hydrogen-filled PHP and a helium-filled PHP. For a cryogenic PHP, the optimal FR is close to the critical FR, and different initial FRs cause the PHP to either reach a dry-out limit or reach a liquid convection limit. Moreover, the temperature dependence of the FR for room temperature fluids can be ignored.
