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在内径分别为1 mm和2 mm的细铜管弯曲而成的40弯头脉动热管试验装置上,采用R123、水和酒精为工作介质,研究了倾斜角及充液率对脉动热管传热性能的影响.结果表明:在相同的热负荷下,当倾斜角从+90°逐渐转到0°,最后转到-90°时,平均蒸发温度有不同程度的提高;在较低负荷下,倾斜角对运行性能的影响比较明显;对于多弯头数管状脉动热管,重力作用对其传热性能的影响仍然存在,但影响程度随着热负荷的增加及管内径的减小而减弱;最佳充液率范围与管内径、加热模式、热负荷及工质种类等因素有关,在工程应用中,最佳充液率可近似取管内总体积的55%左右.
In a 40-bend pulsating heat pipe test device made of a thin copper tube with an inner diameter of 1 mm and a thickness of 2 mm, R123, water and alcohol were used as working media to study the effect of the inclination angle and the liquid filling rate on the heat transfer performance of a pulsating heat pipe The results show that under the same heat load, the average evaporation temperature increases to some extent when the tilt angle gradually changes from + 90 ° to 0 °, and finally to -90 °. At lower load, The influence of the angle on the running performance is obvious. For the multi-elbow tubular pulsating heat pipe, the influence of gravity on the heat transfer performance still exists, but the influence degree decreases with the increase of heat load and the decrease of tube diameter. Liquid filling rate range and pipe diameter, heating mode, heat load and type of working fluid and other factors related to the engineering application, the optimal liquid filling rate can be taken approximately 55% of the total volume within the tube.