The theoretical model of the evaporation and condensation heat transfer process of the axially grooved heat pipe (AGHP) assisted by gravity under small angle inclination is established to investigate the evaporation regimes and the heat transfer characteristics of AGHP. To reveal the heat transfer mechanism of the AGHP, the working state and gas-liquid interface distribution of the AGHP with different input power are analysed. And the influence of the inclination angle and groove structure (length-width ratio), including on the maximum heat transfer of AGHP is also discussed. The numerical simulations indicate that: With the increasing input power, the fin-film evaporation regime transits to the corner-film evaporation regime in the AGHP. The growing inclination angle enhances the gravitational effect on the liquid reflux and increases the critical input power for the evaporation regime transition. As the aspect ratio of the grooves increase, the increasing maximum radius of the meniscus leads to stronger heat transfer capacity of the AGHP.

建立了重力作用下小角度倾斜轴向槽式热管蒸发凝结传热过程的理论模型，研究了轴向蒸发热管的蒸发规律和传热特性。为了揭示AGHP的传热机理，分析了不同输入功率下AGHP的工作状态和气液界面分布。并讨论了倾斜角度和凹槽结构（长宽比）的影响，包括对AGHP最大传热的影响。数值模拟表明：随着输入功率的增加，在AGHP中，翅片薄膜的蒸发状态转变为角膜蒸发的状态。倾斜角的增大增强了液体回流的重力作用，并增加了蒸发状态转变的临界输入功率。随着凹槽的长宽比增加，弯月面的最大半径不断增加，从而导致AGHP的传热能力增强。