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首页> 外文期刊>Energy Conversion & Management >Experimental investigation of a novel type of two-phase closed thermosyphon filled with functionalized carbon nanotubes/water nanofluids for electronic cooling application
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Experimental investigation of a novel type of two-phase closed thermosyphon filled with functionalized carbon nanotubes/water nanofluids for electronic cooling application

机译：新型功能性碳纳米管/水纳米流体填充的新型两相闭式热虹吸管的实验研究

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Two-phase closed thermosyphon as a gravity-assisted heat pipe is an efficient heat transfer device in which heat transmits by evaporation and condensation of a working fluid. Nanofluids are suspensions of nano-sized solid particles in a base fluid which can be used as heat transfer media in the thermosyphon. In the present study, thermal performance of functionalized multi-walled carbon nanotubes/water nanofluids was investigated in a novel type of thermosyphon which was made of an evaporator with square frustum shape, and a condenser composed of two connected tubes. To prepare nanofluids, multi-walled carbon nanotubes were first functionalized using two oxidant agents (potassium persulfate and sodium persulfate) to improve the cooling performance of nanofluids. The prepared nanofluids were characterized by Fourier transform infrared spectroscopy, inductively coupled plasma optical emission spectroscopy, zeta potential, and thermal conductivity analyzer. The results of characterization showed that the nanofluid with sodium functional group had higher stability as well as higher thermal conductivity. Thermal efficiency and thermal resistance were calculated to evaluate the thermal performance of thermosyphon. Using nanofluid with sodium functional group in the thermosyphon showed better performance in terms of higher thermal efficiency and lower thermal resistance. Experimental results also showed that the thermosyphon could perform at higher input powers (up to 90 W) using the nanofluid compared to water (up to 70 W). Furthermore, the results of the temperature distribution of thermosyphon during the test confirmed that two connected tubes in the condenser section could provide pathways for both condensate liquid and vapor. In other words, this behavior indicated that this type of thermosyphon can be considered between a tubular thermosyphon and a loop thermosyphon.
机译：作为重力辅助热管的两相封闭式热虹吸管是一种高效的传热设备，其中热量通过工作流体的蒸发和冷凝而传递。纳米流体是纳米级固体颗粒在基础流体中的悬浮液，可用作热虹吸管中的传热介质。在本研究中，在新型的热虹吸管中研究了功能化的多壁碳纳米管/水纳米流体的热性能，该热虹吸管由截头圆锥形的蒸发器和由两个相连的管组成的冷凝器组成。为了制备纳米流体，首先使用两种氧化剂（过硫酸钾和过硫酸钠）对多壁碳纳米管进行功能化，以改善纳米流体的冷却性能。通过傅立叶变换红外光谱，电感耦合等离子体发射光谱，ζ电势和热导分析仪对制备的纳米流体进行表征。表征结果表明，具有钠官能团的纳米流体具有较高的稳定性和较高的导热性。计算热效率和热阻以评估热虹吸管的热性能。在热虹吸管中使用具有钠官能团的纳米流体在更高的热效率和更低的热阻方面表现出更好的性能。实验结果还表明，与水（高达70 W）相比，使用纳米流体可以使热虹吸管在更高的输入功率（高达90 W）下运行。此外，在测试过程中热虹吸管的温度分布结果证实，冷凝器部分中的两个相连的管可以为冷凝液和蒸气提供通道。换句话说，此行为表明可以在管状热虹吸管和回路热虹吸管之间考虑使用这种类型的热虹吸管。

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