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A unified model for multi-turn closed-loop pulsating heat pipe

机译：多转闭环脉动热管统一模型

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摘要

Numerical modeling of the multi-turn closed-loop pulsating heat pipe (CLPHP) in the bottom, horizontal, and top heat mode is presented in this paper, with water as working fluid. Modeling is carried out for 2-mm ID CLPHP having 5, 16, and 32 turns at different orientations for 10 different cases. Momentum and heat transfer variations with time are investigated by numerically solving the one-dimensional governing equations for vapor bubble and liquid plugs. Instead of considering all the vapor bubble at saturation temperature, vapor bubbles are allowed to remain in super-heated condition. Film thickness is found using a correlation. Two-phase heat transfer coefficient is calculated by considering conduction through the thin film at liquid-vapor interface. Liquid plug merging and splitting result in continuous variation in the number of liquid plugs and vapor bubble with time, which is also considered in the code. During the merging of liquid plugs, a time step-adaptive scheme is implemented and this minimum time step was found to be 10~(-7) s. Model results are compared with the experimental results from literature for heat transfer and the maximum variation in heat transfer for all these cases is below ±39%.
机译：本文介绍了底部，水平和顶部热模式中的多转闭环脉动热管（CLPHP）的数值模型，用水作为工作流体。为具有5,16和32的2mm ID CLPH进行建模，以不同的方向变为10个不同的情况。通过数值求解蒸气泡和液体塞的一维控制器，研究动量和传热变化。代替考虑饱和温度下的所有蒸汽泡，使蒸气气泡保持在超级加热条件下。使用相关性找到膜厚度。通过考虑通过液 - 蒸汽界面处的薄膜传导来计算两相传热系数。液体插头合并和分裂导致液体塞数和随时间的蒸气气泡的连续变化，也在代码中考虑。在液体插头的合并期间，实现了时间步骤自适应方案，并且发现该最小时间步骤为10〜（ - 7）。模型结果与传热文献的实验结果进行比较，并且所有这些情况的热传递的最大变化低于±39％。

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