發(fā)布時間：2018-02-09 16:02

  本文關(guān)鍵詞： 超親水 多孔介質(zhì) 液滴 動力學(xué) 滲透 小液滴發(fā)射　出處：《化工學(xué)報》2016年09期 　論文類型：期刊論文

【摘要】：構(gòu)建了4類不同的超親水微/納多孔結(jié)構(gòu),通過低速液滴撞擊實驗研究了多孔介質(zhì)的結(jié)構(gòu)參數(shù)如微/納尺度特征、孔隙率以及表面粗糙度等對液滴行為和動力學(xué)特性的影響。結(jié)果表明:多孔表面液滴的早期擴散符合慣性擴散的冪函數(shù)規(guī)律,并且納米級結(jié)構(gòu)孔隙率的變化對冪函數(shù)關(guān)系無顯著影響,微米級結(jié)構(gòu)C和α的值隨孔隙率增大而降低,粗糙度的提高能夠?qū)е翪值增大。發(fā)現(xiàn)了兩種新穎的小液滴發(fā)射模式,分別稱為第1階段斷裂和第2階段斷裂。納米級多孔結(jié)構(gòu)發(fā)生第1階段斷裂的原因在于較快的慣性擴散速度和較長的慣性時間;第2階段斷裂發(fā)生于微米級多孔結(jié)構(gòu),原因在于滲透的強化導(dǎo)致液滴高度的快速下降以及慣性時間的縮短。
[Abstract]:Four kinds of superhydrophilic micro / nano porous structures were constructed. The structural parameters such as micro / nano scale characteristics of porous media were studied by low speed droplet impact experiments. The effects of porosity and surface roughness on droplet behavior and kinetic characteristics are investigated. The results show that the early diffusion of droplets on porous surfaces conforms to the law of power function of inertial diffusion. The change of porosity of nanostructure has no significant effect on the power function relationship. The values of C and 偽 of micron structure decrease with the increase of porosity, and the increase of roughness can lead to the increase of C value. Two novel emission modes of small droplets have been found. They are referred to as the first stage fracture and the second stage fracture respectively. The first stage fracture of nanometer porous structure is caused by the faster inertial diffusion velocity and longer inertial time, and the second stage fracture occurs in the micrometer porous structure. The reason is the rapid drop of droplet height and the shortening of inertial time due to the enhancement of permeation.
【作者單位】： 華北電力大學(xué)新能源電力系統(tǒng)國家重點實驗室多相流動與傳熱北京市重點實驗室;
【基金】：國家自然科學(xué)基金項目(51436004,51276061) 中央高校基本科研業(yè)務(wù)費專項資金項目(JB2015202)~~
【分類號】：O35
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本文編號：1498312