【摘要】 基于常规重力热管换热器难以安装翅片结构以强化管外换热,提出一种新型结构形式的重力热管换热器,该热管由一些并排的矩形通道而不是通常的圆管组成。并建立实验测试平台,进行一系列对比实验,重点分析加热功率、工质充液率、倾角及冷凝段风速对其运行热阻的影响。研究结果表明:加热功率对热管的运行性能有重要影响;当工质充液率约为20%时,热管换热器具有最小运行热阻;在最佳充液率为20%和加热功率为360 W时,运行热阻随倾角的增加有减小趋势,但当加热功率较大时,倾角对热管换热器的运行热阻影响不大;随着冷凝端风速的增加,热管换热器的运行热阻不断减小。更多还原

【Abstract】 Based on the fact that normal gravity-assisted heat pipes are difficult to be enhanced with fins,an innovative gravity-assisted heat pipe was developed,which is made of several rectangular channels in parallel instead of normal round channels.A test apparatus was set up,with which the influences of heating input power,filling ratio,inclination angle and air velocity at condenser section on the heat transfer performance were investigated by contrast tests.The results show that heating input power has an important effect on heat transfer characteristics.The minimum heat transfer resistance is gotten at the filling ratio of about 20%.When filling ratio is 20%,the thermal resistance decreases slightly with the increase of the inclination angle when the input power is 360 W,but the inclination angle has little effect on thermal resistance for higher heat input power.The thermal resistance decreases gradually as the air velocity with the increase of condenser section.更多还原