發(fā)布時(shí)間：2018-05-20 16:04

  本文選題：液滴蒸發(fā) + 平板液滴蒸發(fā)��； 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：人們的日常生活和工藝操作的各個(gè)流程中均會(huì)產(chǎn)生大量的液態(tài)顆粒物,當(dāng)這部分液態(tài)顆粒物的粒徑范圍在0.001~100μm之間時(shí),就可以懸浮在空氣中,與空氣組成的多相體系我們稱(chēng)為大氣氣溶膠。懸浮于空氣中的液態(tài)顆粒物可能包含有各類(lèi)離子和微生物,對(duì)環(huán)境造成程度不一的污染,當(dāng)液態(tài)顆粒物中夾帶的微生物為致病菌時(shí)還會(huì)成為威脅人類(lèi)健康的重要隱患。懸浮于空氣中的液態(tài)顆粒的蒸發(fā)現(xiàn)象使得其受力處于一個(gè)動(dòng)態(tài)變化的過(guò)程,因此研究液態(tài)顆粒物的蒸發(fā)過(guò)程對(duì)合理有效地預(yù)測(cè)及控制其分布具有重要意義。目前對(duì)于單個(gè)液態(tài)顆粒物蒸發(fā)過(guò)程的研究多集中在數(shù)值模擬方法的探討,理論公式的推導(dǎo)等方面,對(duì)毫米級(jí)的大液滴和微米級(jí)的小液滴分別提出了不同的蒸發(fā)模型;液態(tài)顆粒物蒸發(fā)過(guò)程的實(shí)驗(yàn)研究較少,目前的主要實(shí)驗(yàn)方法包括液滴懸掛法、多孔球法、飛滴實(shí)驗(yàn)法及氣懸(磁懸)法,研究發(fā)現(xiàn)液滴中包含有其余組分時(shí)蒸發(fā)過(guò)程可分為兩個(gè)階段,液滴在平板上蒸發(fā)時(shí)蒸發(fā)狀況視其接觸線是否釘扎而定�；诖�,本文對(duì)常溫常壓建筑室內(nèi)環(huán)境下液態(tài)顆粒物的蒸發(fā)過(guò)程設(shè)計(jì)了簡(jiǎn)單的實(shí)驗(yàn)系統(tǒng),采用平板液滴蒸發(fā)的方式,通過(guò)稱(chēng)量液滴蒸發(fā)過(guò)程中的質(zhì)量變化說(shuō)明了微生物懸浮液液滴的蒸發(fā)特性。實(shí)驗(yàn)及結(jié)論主要包括三部分內(nèi)容:(1)不同體積純水液滴的蒸發(fā)實(shí)驗(yàn),本文首先分別分析研究了1μL、2μL和5μL的液滴在超疏水涂層玻片上進(jìn)行蒸發(fā)時(shí)的質(zhì)量變化和形態(tài)變化,分析了液滴在平板上蒸發(fā)時(shí)的兩階段現(xiàn)象,提出了在常溫常壓的建筑室內(nèi)環(huán)境下液滴粒徑對(duì)蒸發(fā)的影響;(2)結(jié)合第一部分研究?jī)?nèi)容選定了后續(xù)實(shí)驗(yàn)采用的液滴體積,對(duì)NaCl溶液液滴進(jìn)行了蒸發(fā)實(shí)驗(yàn)研究,發(fā)現(xiàn)溶液中離子的存在將使得液滴蒸發(fā)速度顯著降低,蒸發(fā)階段結(jié)束后玻片上的殘留物直觀反映了液滴在超疏水玻片上蒸發(fā)時(shí)將產(chǎn)生的“咖啡環(huán)效應(yīng)”;(3)對(duì)添加有不同微生物的溶液液滴進(jìn)行了蒸發(fā)實(shí)驗(yàn)研究,結(jié)果顯示液滴中含有微生物時(shí)蒸發(fā)可分為蒸發(fā)階段和平衡階段,不同種類(lèi)的微生物溶液液滴蒸發(fā)過(guò)程的蒸發(fā)階段時(shí)刻不同,平衡階段質(zhì)量波動(dòng)范圍不同。本文研究結(jié)果顯示微生物的存在對(duì)液滴的蒸發(fā)將產(chǎn)生較強(qiáng)影響,對(duì)預(yù)測(cè)室內(nèi)微生物氣溶膠的蒸發(fā)運(yùn)動(dòng)過(guò)程具有重要意義,為設(shè)計(jì)布置合理的空氣凈化系統(tǒng)提供了理論依據(jù)。
[Abstract]:People's daily lives and processes produce a lot of liquid particulate matter, which can be suspended in the air when the particle size of the liquid particle is in the range of 0.001 ~ 100 渭 m. A heterogeneous system consisting of air is called an atmospheric aerosol. Liquid particles suspended in the air may contain various kinds of ions and microbes, which cause varying degrees of pollution to the environment. When the microorganism contained in the liquid particles is a pathogenic bacteria, it will also become an important hidden danger to human health. The evaporation of liquid particles suspended in air makes its force change dynamically. Therefore, it is important to study the evaporation process of liquid particles in order to predict and control their distribution reasonably and effectively. At present, the research on the evaporation process of single liquid particle is mainly focused on the discussion of numerical simulation method and the derivation of theoretical formula. Different evaporation models are put forward for large liquid droplets of millimeter size and small droplets of micron size respectively. There are few experimental studies on the evaporation process of liquid particles. At present, the main experimental methods include droplet suspension method, porous sphere method, flying drop test method and gas suspension (magnetic suspension) method. It is found that the evaporation process can be divided into two stages, and the evaporation condition depends on whether the contact line is pinned or not. Based on this, this paper designed a simple experimental system for the evaporation process of liquid particulate matter in the indoor environment of normal temperature and atmospheric pressure building, adopting the method of flat droplet evaporation. The evaporation characteristics of microbial suspensions were explained by the mass change in the evaporation process of weighing droplets. The experiment and conclusion mainly include three parts: the evaporation experiment of pure water droplets with different volumes. In this paper, the mass and morphology changes of droplets of 1 渭 L ~ (2 渭 L) and 5 渭 L on superhydrophobic coating glass are studied respectively. The two-stage phenomenon of droplet evaporation on the flat plate is analyzed, and the effect of droplet size on evaporation in the indoor environment at room temperature and atmospheric pressure is put forward.) in combination with the first part of the study, the volume of the liquid droplet used in the subsequent experiments is selected. The evaporation experiments of droplets in NaCl solution were carried out. It was found that the evaporation rate of droplets would be significantly reduced by the presence of ions in the solution. The "coffee ring effect" produced when the droplet evaporates on the superhydrophobic glass is directly reflected by the residue on the glass after the evaporation stage. The experimental study on evaporation of liquid droplets with different microbes was carried out. The results show that the evaporation of droplets containing microbes can be divided into evaporation stage and equilibrium stage. The evaporation time of droplet evaporation in different kinds of microbial solutions is different, and the range of mass fluctuation in equilibrium phase is different. The results show that the existence of microbes will have a strong influence on the evaporation of droplets, which is of great significance for predicting the evaporation process of indoor microbial aerosols, and provides a theoretical basis for the design and arrangement of a reasonable air purification system.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X513

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馬力;仇性啟;鄭志偉;崔運(yùn)靜;段小龍;;高溫氣流中液滴蒸發(fā)影響因素的數(shù)值研究[J];石油化工;2013年08期

2 馬力;仇性啟;王健;鄭志偉;易志勇;閻紅巧;;單液滴蒸發(fā)影響因素實(shí)驗(yàn)研究[J];現(xiàn)代化工;2013年01期

3 辛娟娟;周致富;辛慧;陳斌;王國(guó)祥;郭烈錦;;單個(gè)液滴蒸發(fā)模型中不同質(zhì)量傳遞公式的有效性分析[J];化工學(xué)報(bào);2012年06期

4 孫平勇;劉雄倫;劉金靈;戴良英;;空氣微生物的研究進(jìn)展[J];中國(guó)農(nóng)學(xué)通報(bào);2010年11期

5 張婧;夏立江;杜文利;宮小燕;于波;;垃圾填埋場(chǎng)空氣微生物濃度的時(shí)空分布特征[J];農(nóng)業(yè)環(huán)境科學(xué)學(xué)報(bào);2009年06期

6 孫丕喜;陳皓文;于明哲;;銀川空氣微生物含量狀況分析[J];國(guó)土與自然資源研究;2009年02期

7 李小暉;郭重山;鐘嶷;劉慧;周自嚴(yán);楊軼戩;江思力;王志偉;;廣州市公共場(chǎng)所集中空調(diào)通風(fēng)系統(tǒng)微生物衛(wèi)生狀況分析[J];中國(guó)衛(wèi)生檢驗(yàn)雜志;2009年05期

8 黃澤智;姚輝;何躍華;蘇艷青;;連臺(tái)手術(shù)中室內(nèi)空氣質(zhì)量的監(jiān)測(cè)與研究[J];現(xiàn)代預(yù)防醫(yī)學(xué);2008年18期

9 凌琪;王晏平;;黃山風(fēng)景區(qū)夏季空氣微生物分布特征初步研究[J];微生物學(xué)通報(bào);2008年09期

10 徐丙榮;司東霞;;聊城市空氣微生物污染的檢測(cè)及評(píng)價(jià)[J];微生物學(xué)雜志;2008年04期

相關(guān)博士學(xué)位論文 前3條

1 張永建;膠體液滴的蒸發(fā)及其自組裝圖案調(diào)控機(jī)制研究[D];西北工業(yè)大學(xué);2015年

2 趙鵬;燃油液滴蒸發(fā)過(guò)程傳熱傳質(zhì)機(jī)理的數(shù)值模擬與實(shí)驗(yàn)研究[D];北京交通大學(xué);2013年

3 孫煒;空調(diào)室內(nèi)污染液滴的擴(kuò)散及室內(nèi)熱環(huán)境的研究[D];中國(guó)科學(xué)技術(shù)大學(xué);2007年

相關(guān)碩士學(xué)位論文 前1條

1 李艷斌;工業(yè)廠房中敞口槽散發(fā)純水液滴的蒸發(fā)和運(yùn)動(dòng)規(guī)律[D];西安建筑科技大學(xué);2015年

，

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