微液滴鋪展動力學模型及實驗驗證
發(fā)布時間:2018-10-13 16:27
【摘要】:為了研究壁面的潤濕動力學行為,通過對離散化的液膜進行力學平衡方程推導,提出了一種液滴沿壁面鋪展的動力學模型;模型以加速度方程表示鋪展的動態(tài)變化,避免從能量角度計算復雜性的問題;利用動態(tài)接觸角分析儀進行潤濕實驗,比較數(shù)值計算與實驗結(jié)果。計算結(jié)果表明:得到的接觸角隨時間呈指數(shù)規(guī)律變化;液滴表面張力越小液膜越容易鋪展,且所需的鋪展時間越短;液滴度對鋪展起阻礙作用,且縮短鋪展時間;接觸角動態(tài)變化規(guī)律整體一致,標準偏差在1.5°以內(nèi),說明本模型能夠準確地反映液滴鋪展的動態(tài)過程。
[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 擄, which shows that this model can accurately reflect the dynamic process of droplet spreading.
【作者單位】: 煤炭科學研究總院沈陽研究院;太原理工大學機械工程學院;
【基金】:太原理工大學校基金,編號:1205-04020202
【分類號】:O35
本文編號: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 擄, which shows that this model can accurately reflect the dynamic process of droplet spreading.
【作者單位】: 煤炭科學研究總院沈陽研究院;太原理工大學機械工程學院;
【基金】:太原理工大學校基金,編號:1205-04020202
【分類號】:O35
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