Nanofluids have been widely used as working fluids in thermal systems on account of their enhanced aptitudes on heat transfer. In this paper, an aqueous hybrid nanofluid suspension including Fe and CuO nanoparticles (50:50) was prepared at 2 % mass concentration and utilized as working fluid inside a plain heat pipe under miscellaneous working conditions implemented on both evaporator and condenser regions. As a non-ionic surfactant, Triton X-100 was doped into the hybrid suspension at 0.2 % mass concentration for providing stability and extending the hanging time of the nanoparticles. So as to determine the influence of hybrid nanoparticle inclusion in the base fluid on thermal characteristics, a set of experiments for both distilled water and hybrid nanofluid were executed by considering the same operating conditions. Temperature distributions were measured and recorded. These records were used while calculating the heat pipe’s thermal efficiency and thermal resistance, and improvement rates in both were determined. Experimental findings illustrated that hybrid nanofluid utilization decreased the overall wall temperatures and advanced the thermal efficiency of the plain heat pipe up to 72.63 %. Similarly, the heat pipe’s thermal resistance values were able to be declined up to 0.0070 K·W−1 by hybrid nanofluid usage in lieu of distilled water, which also corresponded to a maximum increment rate of 16.91 %.

中文翻译：

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Fe-CuO 混合纳米流体在普通热管中使用的实验研究

纳米流体因其增强的传热能力而被广泛用作热系统中的工作流体。在本文中，制备了质量浓度为 2% 的包含 Fe 和 CuO 纳米颗粒 (50:50) 的水性混合纳米流体悬浮液，并在蒸发器和冷凝器区域实施的各种工作条件下用作普通热管内的工作流体。作为非离子表面活性剂，Triton X-100 以 0.2% 的质量浓度掺杂到混合悬浮液中，以提供稳定性并延长纳米颗粒的悬挂时间。为了确定混合纳米颗粒包含在基液中对热特性的影响，通过考虑相同的操作条件，对蒸馏水和混合纳米流体进行了一组实验。测量并记录温度分布。这些记录用于计算热管的热效率和热阻，并确定两者的改进率。实验结果表明，混合纳米流体的利用降低了整体壁温，并将普通热管的热效率提高了 72.63%。类似地，通过使用混合纳米流体代替蒸馏水，热管的热阻值能够下降至 0.0070 K·W-1，这也对应于 16.91% 的最大增量。实验结果表明，混合纳米流体的利用降低了整体壁温，并将普通热管的热效率提高了 72.63%。类似地，通过使用混合纳米流体代替蒸馏水，热管的热阻值能够下降至 0.0070 K·W-1，这也对应于 16.91% 的最大增量。实验结果表明，混合纳米流体的利用降低了整体壁温，并将普通热管的热效率提高了 72.63%。类似地，通过使用混合纳米流体代替蒸馏水，热管的热阻值能够下降至 0.0070 K·W-1，这也对应于 16.91% 的最大增量。