微液滴铺展动力学模型及实验验证
发布时间：2018-10-13 16:27
【摘要】：为了研究壁面的润湿动力学行为,通过对离散化的液膜进行力学平衡方程推导,提出了一种液滴沿壁面铺展的动力学模型;模型以加速度方程表示铺展的动态变化,避免从能量角度计算复杂性的问题;利用动态接触角分析仪进行润湿实验,比较数值计算与实验结果。计算结果表明:得到的接触角随时间呈指数规律变化;液滴表面张力越小液膜越容易铺展,且所需的铺展时间越短;液滴度对铺展起阻碍作用,且缩短铺展时间;接触角动态变化规律整体一致,标准偏差在1.5°以内,说明本模型能够准确地反映液滴铺展的动态过程。
[Abstract]:In order to study the dynamic behavior of wall wetting, a dynamic model of liquid droplet spreading along the wall is proposed by deducing the dynamic equilibrium equation of discrete liquid film, and the dynamic change of spreading is represented by acceleration equation. In order to avoid the complexity of energy calculation, the dynamic contact angle analyzer is used to carry out wetting experiments, and the numerical results are compared with the experimental results. The calculated results show that the contact angle varies exponentially with time, the smaller the surface tension of liquid droplet is, the easier it is to spread the liquid film, and the shorter the spreading time is, the less the liquid drop degree is, the less the spreading time is, and the smaller the surface tension is, the shorter the spreading time is. The dynamic change of contact angle is consistent and the standard deviation is less than 1.5 掳, which shows that this model can accurately reflect the dynamic process of droplet spreading.
【作者单位】： 煤炭科学研究总院沈阳研究院;太原理工大学机械工程学院;
【基金】：太原理工大学校基金,编号:1205-04020202
【分类号】：O35
本文编号：2269244
[Abstract]:In order to study the dynamic behavior of wall wetting, a dynamic model of liquid droplet spreading along the wall is proposed by deducing the dynamic equilibrium equation of discrete liquid film, and the dynamic change of spreading is represented by acceleration equation. In order to avoid the complexity of energy calculation, the dynamic contact angle analyzer is used to carry out wetting experiments, and the numerical results are compared with the experimental results. The calculated results show that the contact angle varies exponentially with time, the smaller the surface tension of liquid droplet is, the easier it is to spread the liquid film, and the shorter the spreading time is, the less the liquid drop degree is, the less the spreading time is, and the smaller the surface tension is, the shorter the spreading time is. The dynamic change of contact angle is consistent and the standard deviation is less than 1.5 掳, which shows that this model can accurately reflect the dynamic process of droplet spreading.
【作者单位】： 煤炭科学研究总院沈阳研究院;太原理工大学机械工程学院;
【基金】：太原理工大学校基金,编号:1205-04020202
【分类号】：O35
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