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通过对分离式热管水平及小倾角 ( 0°～ 5°)蒸发段传热特性的大比例尺模型的试验研究 ,获得了其壁温特性及换热规律 ,探讨了热流密度、工作温度、倾角及充液率等因素对传热特性的影响 .结果表明 ,与蒸发段垂直布置的分离式热管相比 ,水平及小倾角热管的换热系数较小 .特别是当热流密度大于 2 0kW /m2 时 ,蒸发管上下管壁温差增大 ,沿管长方向上管壁温度的波动较大 ,使上壁的换热系数降低 ,局部烧干热负荷过早出现 ,使热管的工作范围减小 .此外 ,还得出了水平蒸发管平均换热系数的无量纲准则关系式 .
The wall temperature characteristics and heat transfer law were obtained through the experimental study on the large scale model of the heat transfer characteristics of the horizontal heat pipe and the small dip angle (0 ° ~ 5 °) evaporating section. The heat flux, working temperature, dip angle and The results show that the heat transfer coefficient of horizontal and small dip heat pipe is smaller than that of vertical heat pipe, especially when the heat flux is more than 20kW / m2 , The temperature difference between the upper and lower tube walls of the evaporation tube increases and the temperature of the tube wall fluctuates along the tube length direction so that the heat transfer coefficient of the upper wall is reduced and the local heat and dry load occurs prematurely to reduce the working range of the heat pipe. , Also come to the horizontal evaporation tube average heat transfer coefficient of the non-dimensional criterion relationship.