本文選題：電滲析 + 計算流體力學(xué)��； 參考：《中國海洋大學(xué)》2015年碩士論文

【摘要】：電滲析作為一種應(yīng)用較早的水處理技術(shù)在各個領(lǐng)域發(fā)揮著越來越重要的作用。合適的電滲析器組件設(shè)計成為解決電滲析面臨濃差極化和結(jié)垢問題的最佳選擇之一。隨著CFD技術(shù)的不斷發(fā)展和完善,利用CFD技術(shù)來實現(xiàn)對電滲析過程模擬與研究,以及電滲析器組件的設(shè)計與優(yōu)化成為可能。本文通過計算流體力學(xué)(CFD)方法,對電滲析器中加入隔板后流動通道中流場進行三維數(shù)值模擬,探究隔板構(gòu)型對流體流動行為的影響。首先討論了隔板網(wǎng)絲夾角對電滲析過程中流體流動行為的影響。網(wǎng)絲夾角變化時,通過計算和分析流場中壓力降、速度云圖、剪應(yīng)力變化趨勢等來確定較優(yōu)化的網(wǎng)絲夾角。結(jié)果表明壓降與網(wǎng)絲夾角呈指數(shù)型關(guān)系,流體在流場中湍動會隨著網(wǎng)絲夾角的增大而在局部區(qū)域有所加強,壁面附近剪切應(yīng)力隨著網(wǎng)絲夾角的增大而增加,綜合考慮后,確定最佳的網(wǎng)絲夾角應(yīng)盡量在80°～900范圍內(nèi)。然后針對布水槽的構(gòu)型以及隔板長寬比分別進行了模擬研究。結(jié)果表明布水槽的長度對壓降影響較小,而布水槽寬度對壓降影響較明顯,考慮了速度云圖、剪切應(yīng)力分布圖、速度矢量圖以及部分截面速度分布圖后,認為布水槽長度一定的情況下,選擇較寬的布水槽有利于流體湍動,強化傳質(zhì)過程,本文中選擇布水槽寬度為4mmm為宜；隔板長寬比增加會導(dǎo)致壓降增大,而從速度矢量圖、剪切應(yīng)力分布圖以及部分截面速度分布圖,可以看出隨著長寬比的增加,流場中湍動也在加強,但是死區(qū)范圍并不隨著長寬比的增加而逐漸減小,因此,實際應(yīng)用中根據(jù)需要選擇適宜的長寬比,文中較適宜的隔板長寬比為1：0.52。本文的研究可以使我們了解電滲析器內(nèi)部流場隨隔板構(gòu)型的變化情況,希望可對電滲析器的設(shè)計、優(yōu)化和改造提供一定的參考,為企業(yè)的節(jié)能與利潤的提高有一定的意義。
[Abstract]:Electrodialysis, as an earlier water treatment technology, is playing a more and more important role in various fields.The design of suitable electrodialysis unit is one of the best choices to solve the problem of concentration polarization and scaling.With the development and perfection of CFD technology, it is possible to use CFD technology to realize the simulation and research of electrodialysis process, as well as the design and optimization of electrodialysis unit.In this paper, the three-dimensional numerical simulation of the flow field in the flow channel after the addition of the diaphragm in the electrodialysis is carried out by means of computational fluid dynamics (CFD) method, and the influence of the configuration of the diaphragm on the flow behavior of the fluid is investigated.The influence of the angle of the mesh wire on the fluid flow during electrodialysis is discussed.When the angle of mesh wire changes, the optimum angle of mesh wire is determined by calculating and analyzing the pressure drop, velocity cloud diagram and shear stress change trend in the flow field.The results show that the pressure drop is exponentially related to the angle of the mesh wire, the turbulence of the fluid in the flow field will be strengthened in the local region with the increase of the angle of the mesh wire, and the shear stress near the wall increases with the increase of the angle of the mesh wire.The optimum angle of mesh should be within the range of 80 擄/ 900 as far as possible.Then, the configuration of the flume and the ratio of length to width of the spacer were simulated.The results show that the length of the flume has little effect on the pressure drop, while the width of the flume has a more obvious effect on the pressure drop. After considering the velocity cloud diagram, shear stress distribution, velocity vector diagram and partial section velocity distribution,It is considered that when the length of the flume is fixed, the wider flume is favorable to the fluid turbulence and the mass transfer process is strengthened. In this paper, the suitable width of the flume is 4mmm, and the increase of the ratio of length to width of the spacer will lead to the increase of the pressure drop, and the velocity vector diagram.It can be seen that the turbulence in the flow field is strengthened with the increase of the aspect ratio, but the dead zone does not decrease with the increase of the aspect ratio.In practical application, the suitable ratio of length to width is chosen according to the need, and the more suitable ratio of length to width of the partition is 1: 0.52in this paper.The research in this paper can make us understand the change of the flow field with the configuration of the diaphragm in the electrodialysis unit. It is hoped that it can provide a certain reference for the design, optimization and transformation of the electrodialysis device, and it will be of certain significance for the enterprise to save energy and improve the profit.
【學(xué)位授予單位】：中國海洋大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ028.7

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