Heat transfer performance of the large length-to-diameter ratio high-temperature heat pipe with sintered arterial wick

High-temperature heat pipes are critical components for thermal management and energy utilization systems due to their exceptional heat transfer performance. While various length-to-diameter ratios and wick configurations have been explored, the performance of sintered arterial wick structures remains insufficiently investigated. This study pioneers the fabrication of a large length-to-diameter ratio (about 76) high-temperature heat pipe with sintered arterial wick, systematically evaluating its startup characteristics and steady-state heat transfer performance. The developed heat pipe achieved successful start-up within 90 min under a 1200 W heat load. The total thermal resistance decreased gradually with increasing heat load, stabilizing at approximately 0.033 °C/W within the 2100–3000 W range. Notably, increasing the cooling air flow rate would increase the thermal resistance. At 4510 W heat input, the heat pipe delivered 3830 W heat transfer capacity with 85 % efficiency, demonstrating robust adaptability to high thermal loads and intensive cooling conditions. The synergy of the microporous characteristics, macro-composite wick structure, and overfilled working fluid might promote the efficient and stable heat transfer performance. Future attention could be given to further exploiting the heat transfer potential of the high-temperature heat pipe with sintered arterial wick.