表面蒸发对环形液池内稳态热毛细对流的影响

为了解表面蒸发对环形液池内热毛细对流的影响,对4℃冷水在其纯蒸汽环境中蒸发时的热毛细对流进行了数值模拟。结果表明,表面蒸发质量通量与液池内热毛细对流相互耦合,随着蒸发Biot数的增加,表面温度降低,热壁附近蒸发质量通量增大,但冷壁附近蒸发质量通量与Marangoni数密切相关;当Marangoni数较小时,蒸发界面无因次总蒸发质量随蒸发Biot数的增加而增大,当Marangoni数较大时,总蒸发质量随蒸发Biot数先增大、后减小;随着液池深宽比和半径比的增加,流动增强,总蒸发质量也增加。

Effect of surface evaporation on steady thermocapillary convection in an annular pool

In order to understand the effect of the surface evaporation on thermocapillary convection in an annular pool,a series of numerical simulations on thermocapillary convection of cold water around 4℃ in the pure steam environment were carried out.The results show that the surface evaporation mass flux is mutually coupled with thermocapillary convection.With the increase of the evaporation Biot number,the surface temperature is dropped,and the evaporation mass flux near the hot wall is increased,but it near the cold wall is closely related to the Marangoni number.When the Marangoni number is small,the dimensionless total evaporation mass at the evaporation interface increases with the increase of the evaporation Biot number;while when the Marangoni number is large,the total evaporation mass increases first and then decreases with the increase of the evaporation Biot number.With the increase of the aspect ratio and the radius ratio,the flow strengthens and the total evaporation quality also increases.