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首页> 外文期刊>International Journal of Heat and Mass Transfer >Thermal-hydraulic phenomena inside hybrid heat pipe-control rod for passive heat removal
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Thermal-hydraulic phenomena inside hybrid heat pipe-control rod for passive heat removal

机译：混合热管控制杆内部的热工现象，用于被动排热

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Highlights•Self-pressurized hybrid heat pipe was suggested, and its performances were studied.•Effects of non-condensable gas and entrainment on condensation must be considered.•Difference in cross-sectional areas along the test section affects flooding limit.AbstractIn this study, a new type of thermosyphon, the hybrid heat pipe-control rod, was suggested as a passive decay heat removal device in nuclear facilities. A self-pressurization strategy, which is a passive pressure control mechanism, was introduced to achieve high operating pressure in the hybrid heat pipe, because most nuclear facilities are under high-pressure and high-temperature conditions. In the introduced pressurization strategy, a non-condensable gas was charged, and the steam generated, by the phase change of the working fluid during operation, was used as a pressurization source. The feasibility of the pressure control mechanism was experimentally studied using test sections containing nitrogen gas and water as non-condensable gas and working fluid, respectively. Consequently, it was confirmed that the internal pressure of the hybrid heat pipe was increased up to 19.0 bar through the self-pressurization mechanism under the conditions in which the experiments were conducted. Furthermore, the dependencies of the pressure behavior, heat transfer coefficients at the evaporator and adiabatic sections, and flooding-based maximum heat transfer rate on the working fluid fill ratio, initial pressure, and heat load were discussed. The evaporation heat transfer coefficient was independent of the fill ratio and initial pressure, while the condensation heat transfer was inversely proportional to the amount of non-condensable gas charged inside the test section. The maximum heat transfer rate increased as the operating pressure increased, owing to the reduction of entrainment rate. Based on the experimental results, new models on condensation heat transfer and flooding limit were proposed, considering the effects of the non-condensable gas and different cross-sectional areas along the evaporator and adiabatic sections of the hybrid heat pipe.
机译： 突出显示 • 建议使用自压式混合热管，并对其性能进行研究。 • 不可冷凝气体和夹带的影响 • 沿着测试截面的横截面差异会影响水浸极限。 摘要 在此在一项研究中，有人提出了一种新型的热虹吸管，即混合式热管控制杆，作为核设施中的一种被动衰减式除热装置。为了使混合热管达到较高的工作压力，引入了一种自加压策略，即被动压力控制机制，因为大多数核设施都处于高压和高温条件下。在引入的加压策略中，装入了不凝性气体，并且在工作期间由于工作流体的相变而产生的蒸汽被用作加压源。使用分别包含氮气和水作为不可冷凝气体和工作流体的测试部分，通过实验研究了压力控制机制的可行性。因此，证实了在实验条件下，通过自加压机制，混合热管的内部压力增加到19.0 bar。此外，还讨论了压力行为，蒸发器和绝热段的传热系数以及基于溢流的最大传热速率对工作流体填充率，初始压力和热负荷的依赖性。蒸发热传递系数与填充率和初始压力无关，而冷凝热传递与填充在测试区域内的不可冷凝气体量成反比。由于夹带率的降低，最大传热率随着工作压力的增加而增加。在实验结果的基础上，考虑混合气体热管蒸发器和绝热段的不凝性气体和不同截面积的影响，提出了凝结传热和溢流极限的新模型。

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