Abstract The purpose of this study is to experimentally investigate thermal performance of Two Phase Closed Thermosyphon (TPCT) using nanofluid containing CuO nanoparticles at a mass concentration of 1% and 2% wt. For this purpose, an experimental setup was designed and manufactured which contains a copper pipe, 100 cm in length and 18 mm in the inner diameter. TPCT consists of three sections: the evaporator section (40 cm), adiabatic section (20 cm) and condenser section (40 cm). The evaporator section was wrapped with electrical spiral heater to apply heat, and whole section of TPCT was insulated. A cooling water circuit was used to remove the heat from condenser section. The temperatures were measured on the TPCT surface and cooling water inlet and outlet. The inclination angle of the TPCT was fixed at 90°. The effects of various parameters such as heat load (ranging from 200 to 800 W), cooling water flow rate (ranging from 18 to 54 l/h) and type of working fluid on the thermal performance of TPCT were examined. The results were plotted graphically and discussed in detail. As a result, the performance enhancement was established by using CuO/water nanofluids instead of pure water in TPCT. Approximately 10% and 18.5% enhancement were found when 1% CuO/water and 2% CuO/water nanofluids were used, respectively. In addition, TPCT thermal resistance was reduced averagely 25% and 35% with the use of 1%CuO/water and 2%CuO/water working fluids, compared to the base fluid pure water.

中文翻译：

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CuO/水纳米流体填充两相闭式热虹吸管（TPCT）热效率的实验研究

摘要 本研究的目的是使用含有质量浓度为 1% 和 2% wt 的 CuO 纳米颗粒的纳米流体对两相闭式热虹吸管 (TPCT) 的热性能进行实验研究。为此，设计并制造了一个实验装置，其中包含一根长 100 厘米、内径 18 毫米的铜管。TPCT 由三部分组成：蒸发器部分（40 厘米）、绝热部分（20 厘米）和冷凝器部分（40 厘米）。蒸发段用螺旋电加热器包裹加热，TPCT全段隔热。冷却水回路用于去除冷凝器部分的热量。在 TPCT 表面和冷却水入口和出口处测量温度。TPCT 的倾角固定为 90°。研究了热负荷（200 至 800 W）、冷却水流量（18 至 54 l/h）和工作流体类型等各种参数对 TPCT 热性能的影响。结果以图形方式绘制并详细讨论。因此，通过在 TPCT 中使用 CuO/水纳米流体代替纯水来提高性能。当使用 1% CuO/水和 2% CuO/水纳米流体时，分别发现了大约 10% 和 18.5% 的增强。此外，与基液纯水相比，使用1%CuO/水和2%CuO/水工质，TPCT热阻平均降低25%和35%。结果以图形方式绘制并详细讨论。因此，通过在 TPCT 中使用 CuO/水纳米流体代替纯水来提高性能。当使用 1% CuO/水和 2% CuO/水纳米流体时，分别发现了大约 10% 和 18.5% 的增强。此外，与基液纯水相比，使用1%CuO/水和2%CuO/水工质，TPCT热阻平均降低25%和35%。结果以图形方式绘制并详细讨论。因此，通过在 TPCT 中使用 CuO/水纳米流体代替纯水来提高性能。当使用 1% CuO/水和 2% CuO/水纳米流体时，分别发现了大约 10% 和 18.5% 的增强。此外，与基液纯水相比，使用1%CuO/水和2%CuO/水工质，TPCT热阻平均降低25%和35%。