This paper conducted an experimental study on the heat transfer performance of pulsating heat pipe (PHP) under three different working fluids: ultrapure water, n-butanol self-rewetting fluid (SRWF), and self-rewetting FeO-nanofluid (SRNF). The effects of filling ratio (FR), heating power, and magnetic field are studied. The results mainly show that the PHP with SRNF under a magnetic field, the start-up time increases, the evaporation section operating temperature increases, and the thermal performance decreases as the filling ratio increases. Increasing the FR, applying SRWF and SRNF can effectively increase the dry-out limit of PHP. At FR = 50 %, the overall thermal performance of PHP is best. In 10–130W, the thermal resistance of the SRWF and the SRNF with/without magnetic field is reduced by 14.5 %–27.8 %, 27.6 %–47.9 %, and 4.2 %–24.8 %, respectively, compared with that of ultrapure water. Similarly, compared without a magnetic field, the thermal resistance of SRNF with a magnetic field is reduced by 14.0 %–35.1 %. At FR = 50 %, the heat transfer performance of SRNF-PHP is best with a magnetic field. When the input power is 130W, the effective heat transfer coefficient is 5967.6 W/m∙ K, approximately 13.92 times greater than copper.

中文翻译：

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自再润湿Fe3O4纳米流体脉动热管传热性能实验研究

本文对超纯水、正丁醇自再润湿流体(SRWF)和自再润湿Fe3O纳米流体(SRNF)三种不同工质下脉动热管(PHP)的传热性能进行了实验研究。研究了填充率（FR）、加热功率和磁场的影响。结果主要表明，带有SRNF的PHP在磁场作用下，随着填充率的增加，启动时间增加，蒸发段工作温度升高，热性能下降。提高FR、应用SRWF和SRNF可有效提高PHP的干透极限。当FR=50%时，PHP的整体热性能最好。在10-130W范围内，有/无磁场的SRWF和SRNF的热阻与超纯水相比分别降低了14.5%~27.8%、27.6%~47.9%和4.2%~24.8%。同样，与无磁场相比，有磁场的SRNF热阻降低了14.0%~35.1%。当 FR = 50 % 时，SRNF-PHP 在磁场下的传热性能最佳。当输入功率为130W时，有效传热系数为5967.6 W/m∙K，约为铜的13.92倍。