發(fā)布時(shí)間：2018-02-09 16:02

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

【摘要】：構(gòu)建了4類(lèi)不同的超親水微/納多孔結(jié)構(gòu),通過(guò)低速液滴撞擊實(shí)驗(yàn)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(duì)液滴行為和動(dòng)力學(xué)特性的影響。結(jié)果表明:多孔表面液滴的早期擴(kuò)散符合慣性擴(kuò)散的冪函數(shù)規(guī)律,并且納米級(jí)結(jié)構(gòu)孔隙率的變化對(duì)冪函數(shù)關(guān)系無(wú)顯著影響,微米級(jí)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(chēng)為第1階段斷裂和第2階段斷裂。納米級(jí)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(kuò)散速度和較長(zhǎng)的慣性時(shí)間;第2階段斷裂發(fā)生于微米級(jí)多孔結(jié)構(gòu),原因在于滲透的強(qiáng)化導(dǎo)致液滴高度的快速下降以及慣性時(shí)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(guó)家重點(diǎn)實(shí)驗(yàn)室多相流動(dòng)與傳熱北京市重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51436004,51276061) 中央高�；究蒲袠I(yè)務(wù)費(fèi)專(zhuān)項(xiàng)資金項(xiàng)目(JB2015202)~~
【分類(lèi)號(hào)】：O35
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本文編號(hào)：1498312