论文标题
水滴冰冻阻尼的冲击
Freezing-damped impact of a water drop
论文作者
论文摘要
我们通过实验研究冻结对水滴扩散的影响。每当水滴影响温度低于0°C的冷表面时，一层薄层在扩散过程中就会生长。这种冷冻对影响具有显着影响：在给定的雷诺和韦伯数字上，我们表明降低表面温度会降低最大程度的下降程度。使用该冰层和粘性边界层之间的类比，在扩散过程中也会生长，我们能够将冷冻的效果建模为有效的粘度。因此，设计用于粘性下降冲击的缩放定律可以应用于这样的固化问题，避免了对热动力学的完整而复杂的建模。
We experimentally investigate the effect of freezing on the spreading of a water drop. Whenever a water drop impacts a cold surface, whose temperature is lower than 0°C, a thin layer of ice grows during the spreading. This freezing has a notable effect on the impact: at given Reynolds and Weber numbers, we show that lowering the surface temperature reduces the drop maximal extent. Using an analogy between this ice layer and the viscous boundary layer, which also grows during the spreading, we are able to model the effect of freezing as an effective viscosity. The scaling laws designed for viscous drop impact can therefore be applied to such a solidification problem, avoiding the recourse to a full and complex modelling of the thermal dynamics.
