关键词: 甲醇水溶液, 甲醇, 脉动热管, 倾角, 传热性能

Abstract: The experiments on heat transfer characteristics of the start-up and steady operation processes of pulsating heat pipe were conducted using three working fluids at various inclination angles and heat inputs. Water，methanol，and aqueous methanol were used as working fluid with 50% fill ratio. The characteristics were compared and analyzed between aqueous methanol，water，methanol in the start-up and steady operation processes. The type of start-up for aqueous methanol was gradual start-up at low heat inputs and different inclination angles. Start-up time span of aqueous methanol was longer than that of methanol，but shorter than that of water. In a steady operation process，the temperature of aqueous methanol in heating section was lower than that of methanol，and fluctuation of temperature was larger. Aqueous methanol showed the best thermal performance among them at low and medium heat inputs. The minimum thermal resistances of aqueous methanol were 0.38℃/W and 0.3℃/W at the angle 45°and 90°，respectively.

Key words: aqueous methanol, methanol, pulsating heat pipe, inclination angle, heat transfer performance