Abstract The number of turns is an important geometric parameter of the pulsating heat pipe. Currently, there is no criterion for selecting the number of turns. To study the effects of the number of turns, two hydrogen closed-loop pulsating heat pipes were tested with 2 turns and 5 turns, respectively. Other parameters were kept the same. To eliminate the influence of the condenser temperature, the condenser temperature was maintained at 19 K under different heat loads. The experiments were carried out at three filling ratios, 28%, 34% and 50%, with a heat load between 0 and 5.5 W. The results show that thermal conductivities of both PHPs are in the range of 10,000 to 70,000 W/(m·K), and the thermal resistances are in the range of 0.2 to 0.8 K/W. The effective thermal conductivity of the 2-turn PHP is higher than that of the 5-turn PHP at each filling ratio. But the thermal resistance of the 2-turn PHP is larger than that of the 5-turn PHP due to the smaller heat transfer area. If the 2-turn PHP is scaled 2.5 times, which is a total of 5 turns, it will outperform the 5-turn PHP in terms of low thermal resistance and high effective conductivity.

中文翻译：

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不同匝数下氢气脉动热管的实验研究

摘要 匝数是脉动热管的重要几何参数。目前，没有选择匝数的标准。为了研究匝数的影响，分别用2匝和5匝测试了两个氢气闭环脉动热管。其他参数保持不变。为了消除冷凝器温度的影响，在不同的热负荷下，冷凝器温度保持在 19 K。实验在 28%、34% 和 50% 三种填充率下进行，热负荷在 0 到 5.5 W 之间。结果表明，两种 PHP 的热导率都在 10,000 到 70,000 W/(m ·K)，热阻在0.2～0.8K/W范围内。在每个填充率下，2 圈 PHP 的有效导热系数都高于 5 圈 PHP。但由于传热面积较小，2匝PHP的热阻大于5匝PHP。如果将2圈PHP按比例缩放2.5倍，即总共5圈，在低热阻和高有效导电率方面将优于5圈PHP。