Experimental Investigation of Heat Transfer Efficiency of a Gravity-Assisted Heat Pipe Operating Under Different Conditions Using Parametric Nanofluids

Nanofluids are attracting attention as a significant innovation that improves performance in heat transfer systems due to their high thermal conductivity coefficient and low thermal resistance properties. In this study, pure water-based nanofluids were prepared using 0.5% alumina (Al2O3), titanium dioxide (TiO2), and copper (II) oxide (CuO) to extract heat from the evaporator region of a gravity-assisted heat pipe. Additionally, sodium dodecylbenzene sulfonate surfactant was used to stabilize the nanofluid. In the experimental study, the effects of integrating a water jacket into the gravity-assisted heat pipe and using different amounts of working fluids (nanofluids) on heat transfer were investigated separately. According to results, the lowest R value was found to be 0.1846 at the 80ml and 100ml volume ratios using CuO nanofluid, while the second lowest R value was calculated to be 0.1932 at the 80ml volume ratio using Al2O3 nanofluid. The results also showed that the CuO nanofluid exhibited the lowest R-value, demonstrating better thermal performance by 4.64% compared to the Al2O3 nanofluid and by 8.77% compared to the TiO2 nanofluid. This study aims to provide a sustainable solution for industrial applications requiring energy efficiency and to contribute to the body of knowledge in the field, laying the groundwork for further research.