莱顿弗罗斯特水滴振荡模式的影响因素及机理探究

Factors affecting the oscillatory modes of Leidenfrost water drops and its mechanism

探讨了莱顿弗罗斯特效应下水滴振荡的二维边界条件,在此基础上可求解液滴的本征频率.将振荡归结为由表面波叠加形成的驻波,并引入参量共振描述振荡的物理机制.探究了一定温度下振荡模式的演化规律,给出了振荡模式随半径的分布及振荡频率随时间的变化.验证了热对流为液滴与表面间主要的传热方式,并对真实液滴的几何形状做了定性探讨.

The two-dimensional boundary condition of the eigenmodes of the oscillatory of Leidenfrost water drops was discussed,which was used in finding their eigen frequencies.It was shown that the oscillations were in fact standing waves generated as a result of the superposition of the surface wave,and the mechanism of the oscillation was described using parametric vibration.With some research into how the modes varied under different conditions,the relation between the oscillatory modes of the drop and its radius was given,and how the frequency of oscillation changed as time passed.Also,convection was the primary form of the heat exchange between the drop and the hot surface,and some discussions about the actual geometry of the Leidenfrost water drops were given.