乙醇水溶液“液滴爆炸”尺度演化实验与理论探究

Experimental and Theoretical Study of the Scale Evolution in Droplet Explosion of Ethanol Aqueous Solution

为了描述乙醇水溶液二元体系于疏水性界面上的“液滴爆炸”现象尺度演化过程,提出了“液滴爆炸”物理机理模型——“冲刷”模型,建立了“液滴爆炸”初级动力学方程;采用理论分析与实验结果对照修正法,逐步完善理论模型;引入黏滞力,修正了“液滴爆炸”范围尺度无限的问题;引入水分子团作用力衰减修正,解决了理论上“液滴爆炸”尺度收缩过快的问题。依据所建立的理论模型,研究了乙醇浓度和基底液体黏度对“液滴爆炸”尺度演化的影响。与实验结果对比分析表明,基于“冲刷”模型的“液滴爆炸”尺度演化理论可很好地解释实验现象,同时使用该模型有利于对“液滴爆炸”尺度演化过程的理论描述。

We propose a physical model-“scour”model that can characterize scale evolution of“droplet explosion”in ethanol solution,develop primary kinetic equations of scale evolution of“droplet explosion”.We also compare experiment results with theory model for value revision.Correction a matter of“droplet explosion”scale value is unbound via introducing viscous force.Correction for water cluster force attenuation has been introduced to solve the problem that the process of“droplet explosion”scaling down is too fast.According to the established theoretical model,the effects of ethanol concentration and substrate liquid viscosity on the scale evolution of“droplet explosion”are investigated.Analysis of the experimental results shows that the scale evolution theory of“droplet explosion”based on the“scour”model explains the experimental phenomenon well.This model simplifies the theory so that it can be tested experimentally.