本文選題：空氣取水 + 微流控　； 參考：《哈爾濱工業(yè)大學》2015年碩士論文

【摘要】：淡水作為人類生存必需資源,具有可直接利用總量少、地理分布不均、受污染情況日益嚴重等問題。為此,許多生產(chǎn)淡水、提高水資源利用率的手段應運而生。在野外探險、科考、旅行時,經(jīng)常會遇到沙漠、熱帶雨林、高原等難以找到足夠清潔淡水的地方,而攜帶大量淡水又存在增加負重、無法補給等問題。因此,一種能夠提供適宜飲用的清潔淡水并且方便攜帶的裝置,對于在條件苛刻的戶外環(huán)境中滿足使用者的飲水需求,保障生命安全是十分重要的。本文結(jié)合吸附解析式取水原理,將聚二甲基硅氧烷(Polydimethylsiloxane,PDMS)材料應用到空氣取水裝置中,提出了一種可循環(huán)反復地對空氣中的水蒸汽進行收集、并將其轉(zhuǎn)變成淡水的便攜微型裝置,即一種微流控空氣取水裝置。本文對微流控空氣取水裝置的工作原理進行研究,對空氣取水過程進行數(shù)學建模�；诹黧w力學基本理論,建立微流道內(nèi)液體流動的數(shù)學模型,分析氣液兩相流在微流道中的流動規(guī)律,結(jié)合熱力學原理,建立微流控裝置中的氣—液兩相變化過程的熱流耦合數(shù)學模型。通過數(shù)值計算對裝置內(nèi)水的蒸發(fā)和冷凝等熱流耦合場的動態(tài)特性進行模擬分析。利用ANSYS ICEM CFD軟件對微流道進行三維建模,并對三維模型進行網(wǎng)格劃分及邊界條件設置,用FLUENT軟件對冷凝過程進行仿真分析,得到微流道內(nèi)的流場、溫度場及氣相體積分數(shù)分布變化特性。利用COMSOL多物理場仿真軟件對加熱蒸發(fā)的解析釋放過程進行二維動態(tài)模擬,得到取水容腔內(nèi)的流場、溫度場及氣相體積分數(shù)分布變化特性。對微流控空氣取水裝置的制備和工作過程進行實驗研究。研究軟刻蝕工藝制作微流控芯片的方法,采用紅外熱像儀對取水過程的溫度場進行觀測,得到了實驗條件下蒸發(fā)冷凝過程的溫度分布規(guī)律,驗證仿真分析結(jié)果,從而為微流控空氣取水裝置的設置提供了理論依據(jù)。
[Abstract]:As a necessary resource for human survival, fresh water has many problems, such as low total direct utilization, uneven geographical distribution and increasingly serious pollution. For this reason, a lot of production fresh water, the means that raises water resource efficiency arises at the historic moment. In the field of exploration, scientific research, travel, often encounter desert, tropical rain forest, plateau and other difficult to find enough clean fresh water, and carrying a large amount of fresh water has the problem of increasing load, unable to supply, and so on. Therefore, a device which can provide clean fresh water suitable for drinking and is easy to carry is very important to meet the drinking water needs of users in the harsh outdoor environment and to ensure the safety of life. In this paper, based on the principle of adsorptive and analytical water intake, the polydimethylsiloxane (PDMS) material was applied to the air water collection unit. A portable micro device for collecting water vapor in the air repeatedly and turning it into fresh water was proposed. The utility model relates to a microfluidic air water intake device. In this paper, the working principle of microfluidic air water intake device is studied, and the mathematical model of air water intake process is established. Based on the basic theory of fluid mechanics, the mathematical model of liquid flow in microchannel is established, and the flow law of gas-liquid two-phase flow in microchannel is analyzed. A coupled heat flux mathematical model for the gas-liquid two-phase variation process in a microfluidic device is established. The dynamic characteristics of coupled heat flux fields such as evaporation and condensation of water in the plant are simulated and analyzed by numerical calculation. Using ANSYS ICEM CFD software to model the microchannel, mesh the 3D model and set the boundary conditions, and use fluent software to simulate and analyze the condensation process, and obtain the flow field in the microchannel. The variation of temperature field and gas phase volume fraction distribution. By using COMSOL multi-physical field simulation software, the two-dimensional dynamic simulation of the analytical release process of heating evaporation was carried out, and the variation characteristics of the flow field, temperature field and gas phase volume fraction distribution in the water intake chamber were obtained. The preparation and working process of the micro-fluidic air water intake device were studied experimentally. The method of fabricating microfluidic chip by soft etching process is studied. The temperature field of the water intake process is observed by infrared thermal imager. The temperature distribution of evaporative condensation process is obtained under the experimental conditions, and the simulation results are verified. Thus, it provides a theoretical basis for the installation of microfluidic air intake device.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN492

【引證文獻】

相關(guān)會議論文 前1條

1 李明;;太陽能固體吸附式制冰裝置關(guān)鍵技術(shù)研究[A];中國制冷學會2005年制冷空調(diào)學術(shù)年會論文集[C];2005年

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本文編號：2093281