振荡热管当量导热系数的理论推导与分析

Theoretical deduction and analysis of equivalent thermal conductivity of oscillating heat pipes

把振荡热管模型简化为由管壳、液膜和振荡液塞3部分组成的具有高导热系数的复合材料。给出了振荡热管的径向和轴向当量导热系数;并从理论上推导出了振荡液塞当量导热系数的定性表达式,该导热系数与液塞的振荡频率和振荡幅度成正比;最后根据试验结果分析了热流密度、充液率和倾角等因素对当量导热系数的影响,即随着热流密度和充液率的增加,当量导热系数先增后减,倾角对当量导热系数的影响与通道弯数有关。

Oscillating heat pipes （OHPs） were considered as composite materials with high thermal conductivities, consisting of tube walls, thin liquid films and oscillating plugs. The equivalent thermal conductivity of oscillating heat pipes in radial and axial direction was presented. At the same time, the equivalent conductivity of oscillating plugs was deducted theoretically, and the conductivity was proportional to the oscillating frequency and the oscillating amplitude of plugs. The effects of input heat flux, filling ratio and inclination angle on the conductivity were analyzed according to experimental results. The result shows that the conductivity increases first and decreases afterwards with the increasing of input heat flux and filling ratio. The effect of inclination angle on the conductivity is relevant to OHP＇s channel turns.