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Correlation to Predict the Maximum Heat Flux of a Vertical Closed-Loop Pulsating Heat Pipe

机译:关联以预测垂直闭环脉动热管的最大热通量

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摘要

The objective of this study is to experimentally investigate the effect of various parameters on the maximum heat flux of a vertical closed-loop pulsating heat pipe (CLPHP) and the inside phenomena that cause maximum heat flux to occur. A correlation to predict the maximum heat flux using the obtained results was also established. Quantitative and qualitative experiments were conducted and analyzed. A copper CLPHP and a transparent high-temperature glass capillary tube CLPHP were used in the quantitative and qualitative experiments. From the study, it was found that when the internal diameter and number of meandering turns increased, the maximum heat flux increased. However, when the evaporator section length increased, the maximum heat flux decreased. The maximum heat flux of a CLPHP occurs due to the dry-out of liquid film at the evaporator section. This occurs after a two-phase working fluid circulation changes flow pattern from countercurrent slug flow to co-current annular flow, because the vapor velocity increases beyond a critical value. A correlation to predict the maximum heat flux obtained from this study was developed.
机译:这项研究的目的是通过实验研究各种参数对垂直闭环脉动热管(CLPHP)的最大热通量以及导致最大热通量发生的内部现象的影响。还建立了使用获得的结果预测最大热通量的相关性。进行了定性和定量实验。在定量和定性实验中使用了铜CLPHP和透明的高温玻璃毛细管CLPHP。从研究中发现,当内径和弯曲匝数增加时,最大热通量增加。但是,当蒸发器截面长度增加时,最大热通量会降低。 CLPHP的最大热通量是由于蒸发器部分的液膜变干而产生的。这是在两相工作流体循环将流型从逆流弹状流变为顺流环形流之后发生的,因为蒸汽速度增加到超过临界值。建立了相关性以预测从这项研究中获得的最大热通量。

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