非等温加热器上部分润湿时三重接触线的动力学
Dynamics of the triple contact line on a non-isothermal heater at partial wetting
摘要：
本文分析了气体是与液体相对应的饱和蒸汽的情况下，如沸腾时的汽泡中的气-液-固三相接触线的动力学。它示出，即使是小的过热（相对于饱和温度）导致蒸发的吸附液膜和真正的三重接触建立。结果表明，在这种情况下，流体动力接触线奇异性不能放松与Navier滑移条件。建议应用二阶导数滑移条件。对于部分润湿条件，非稳态接触线问题，其中接触线运动是由蒸发或冷凝引起的，在接触线附近的润滑近似处理。该区域的高热通量需要考虑加热器内部的瞬态热传导。两个2D的问题，没有相变的液滴收缩和液滴蒸发的解决和分析所提出的方法的说明。
英文摘要：
The dynamics of the triple gas-liquid-solid contact line is analysed for the case where the gas is the saturated vapour corresponding to the liquid, like in the vapour bubble in boiling. It is shown that even small superheating (with respect to the saturation temperature) causes evaporation of the adsorption liquid film and the true triple contact is established. It is shown that the hydrodynamic contact line singularity cannot be relaxed with the Navier slip condition under such circumstances. Augmented with the second derivative slip condition is proposed to be applied. For the partial wetting conditions, a non-stationary contact line problem where the contact line motion is caused by evaporation or condensation is treated in the lubrication approximation in the vicinity of the contact line. High heat fluxes in this region require the transient heat conduction inside the heater to be accounted for. Two 2D problems, those of drop retraction with no phase change and of drop evaporation are solved and analysed as illustrations of the proposed approach.
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