【摘要】：調(diào)控表面潤(rùn)濕性在微流體系統(tǒng)、可調(diào)焦液體透鏡及潤(rùn)滑減阻等方面具有廣泛的應(yīng)用。電潤(rùn)濕是一種實(shí)時(shí)改變表面潤(rùn)濕性的有效方法,但是如何實(shí)現(xiàn)潤(rùn)濕性的可逆轉(zhuǎn)變?nèi)匀皇且粋�(gè)未解決的難題。為了理解電潤(rùn)濕工藝中潤(rùn)濕狀態(tài)轉(zhuǎn)變的機(jī)理和影響因素從而為潤(rùn)濕狀態(tài)的可控轉(zhuǎn)變提供理論指導(dǎo),論文對(duì)電場(chǎng)激勵(lì)下潤(rùn)濕性轉(zhuǎn)變的動(dòng)態(tài)過(guò)程進(jìn)行了理論和試驗(yàn)研究,主要工作和結(jié)論包括:基于能量最小化方法,對(duì)外加電場(chǎng)、表面微觀結(jié)構(gòu)參數(shù)及表面能對(duì)潤(rùn)濕狀態(tài)轉(zhuǎn)變能壘的影響進(jìn)行了理論推導(dǎo),給出了不同表面微觀結(jié)構(gòu)條件及電場(chǎng)激勵(lì)作用下潤(rùn)濕性轉(zhuǎn)變的條件;從電動(dòng)力學(xué)角度出發(fā),將電場(chǎng)激勵(lì)作為電動(dòng)力耦合到流體動(dòng)力學(xué)兩相流方程作為潤(rùn)濕狀態(tài)轉(zhuǎn)變數(shù)值模擬的理論模型,為數(shù)值計(jì)算和試驗(yàn)結(jié)果分析提供了理論基礎(chǔ)。基于相場(chǎng)法兩相流模型,對(duì)電場(chǎng)激勵(lì)作用下潤(rùn)濕狀態(tài)轉(zhuǎn)變的動(dòng)力學(xué)過(guò)程進(jìn)行了數(shù)值模擬。結(jié)果表明,電場(chǎng)激勵(lì)作用下,潤(rùn)濕狀態(tài)轉(zhuǎn)變的驅(qū)動(dòng)力主要源于氣液界面的電動(dòng)力和由于電場(chǎng)對(duì)界面表面張力系數(shù)的影響表現(xiàn)出來(lái)的電潤(rùn)濕效應(yīng);潤(rùn)濕狀態(tài)轉(zhuǎn)變的動(dòng)態(tài)過(guò)程及最終結(jié)果主要由氣液界面電場(chǎng)決定;影響電場(chǎng)的因素包括電壓、介電層及表面微觀結(jié)構(gòu)形式;表面結(jié)構(gòu)影響電場(chǎng)分布及潤(rùn)濕狀態(tài)轉(zhuǎn)變能壘,優(yōu)化表面微觀結(jié)構(gòu)特征可以調(diào)控潤(rùn)濕狀態(tài)轉(zhuǎn)變過(guò)程。通過(guò)硅微加工工藝制備了不同幾何特征的微結(jié)構(gòu)陣列,對(duì)微觀表面結(jié)構(gòu)影響潤(rùn)濕性轉(zhuǎn)變的規(guī)律進(jìn)行了實(shí)驗(yàn)研究。結(jié)果表明,由于能壘的存在,不能實(shí)現(xiàn)表面潤(rùn)濕性的完全可逆轉(zhuǎn)變;控制部分填充狀態(tài),可一定程度實(shí)現(xiàn)表面潤(rùn)濕性的可逆轉(zhuǎn)變;可逆程度與部分填充程度存在一定關(guān)系,潤(rùn)濕性的可逆性有一定的可控性。通過(guò)激光加工在金屬基底表面制備了具有多級(jí)微觀結(jié)構(gòu)的耐磨疏水表面,對(duì)疏水性影響摩擦性能的規(guī)律進(jìn)行了初步的試驗(yàn)研究。結(jié)果表明,摩擦副表面疏水性在動(dòng)壓潤(rùn)滑條件下可以減小摩擦系數(shù),但是在邊界潤(rùn)滑條件下會(huì)使得摩擦系數(shù)顯著增加。
[Abstract]:Surface wettability control has been widely used in micro fluid systems, focusing liquid lenses and lubricating drag reduction. Electrical wetting is an effective method to change the surface wettability in real time, but how to realize the reversible transformation of wettability is still an unsolved problem. In order to understand the mechanism and influencing factors of wetting state transition in electric wetting process, the dynamic process of wettability transition under electric field excitation is studied theoretically and experimentally. The main work and conclusions are as follows: based on the energy minimization method, the effects of applied electric field, surface microstructure parameters and surface energy on the wetting state transition barrier are derived theoretically. The conditions of wettability transformation under different surface microstructure and electric field excitation are given, and from the point of view of electrodynamics, The electric field excitation is coupled to the hydrodynamic two-phase flow equation as the theoretical model for the numerical simulation of the wetting state transition, which provides a theoretical basis for the numerical calculation and the analysis of the experimental results. Based on the two-phase flow model of phase field method, the dynamic process of wetting state transition under electric field excitation is numerically simulated. The results show that the driving force of the wetting state transition under the electric field excitation is mainly from the electrodynamic force of the gas-liquid interface and the electric wetting effect due to the influence of the electric field on the surface tension coefficient of the interface. The dynamic process and final results of the wetting state transition are mainly determined by the gas-liquid interface electric field, the factors affecting the electric field include voltage, dielectric layer and surface microstructure, the surface structure influences the electric field distribution and the transition barrier of the wetting state. The process of wetting state transition can be regulated by optimizing the surface microstructure. Microstructural arrays with different geometric characteristics were fabricated by silicon micromachining. The effect of microstructures on wettability transformation was studied experimentally. The results show that due to the existence of energy barrier, the complete reversible transformation of surface wettability can not be realized, and the reversible transformation of surface wettability can be realized to some extent by controlling the partial filling state, and the degree of reversibility is related to the degree of partial filling. The reversibility of wettability has certain controllability. The wear-resistant hydrophobic surface with multistage microstructure was prepared by laser processing on the surface of metal substrate. The effect of hydrophobicity on friction performance was studied. The results show that the hydrophobicity of the surface of friction pair can decrease the friction coefficient under hydrodynamic lubrication condition, but the friction coefficient can be increased significantly under boundary lubrication condition.
【學(xué)位授予單位】：西安理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH117.2

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 唐彪;趙青;周敏;白鵬飛;李發(fā)宏;Robert A.HAYES;周國(guó)富;;印刷電潤(rùn)濕顯示技術(shù)研究進(jìn)展[J];華南師范大學(xué)學(xué)報(bào)(自然科學(xué)版);2016年01期

2 丁玉成;田洪淼;邵金友;李祥明;;電驅(qū)動(dòng)微納米模塑技術(shù)的成形機(jī)理及工藝參數(shù)影響研究[J];機(jī)械工程學(xué)報(bào);2013年06期

3 劉力行;曹瑞軍;白龍騰;李祥明;;納米壓印技術(shù)與感光樹(shù)脂應(yīng)用的發(fā)展[J];信息記錄材料;2011年02期

4 施政余;李梅;趙燕;路慶華;;潤(rùn)濕性可控智能表面的研究進(jìn)展[J];材料研究學(xué)報(bào);2008年06期

5 孫志文;謝二慶;韓衛(wèi)華;武麗慧;徐顯波;;電潤(rùn)濕的研究進(jìn)展[J];液晶與顯示;2008年03期

6 江雷;從自然到仿生的超疏水納米界面材料[J];新材料產(chǎn)業(yè);2003年03期

7 李吉躍,高麗洪;內(nèi)聚力-張力學(xué)說(shuō)的新證據(jù)[J];北京林業(yè)大學(xué)學(xué)報(bào);2002年04期

，

本文編號(hào)：2276125