本文選題：液固兩相流　切入點(diǎn)：固體懸浮　出處：《華東理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：固液非均相反應(yīng)廣泛存在于化工生產(chǎn)過程中,這類反應(yīng)體系中固相在攪拌釜內(nèi)的分散狀態(tài)對(duì)反應(yīng)過程起關(guān)鍵作用。本文以計(jì)算流體力學(xué)(CFD)技術(shù)為研究手段,應(yīng)用多重參考系法以及歐拉多相流模型,對(duì)雙層攪拌釜內(nèi)固液兩相流進(jìn)行數(shù)值模擬,分別考察了攪拌釜的結(jié)構(gòu)參數(shù)、內(nèi)構(gòu)件擋板以及研究體系的物性參數(shù)對(duì)顆粒懸浮性能的影響。論文主要得到以下結(jié)論：雙層下壓式斜槳中,上下層槳葉間的協(xié)同作用可以有效促進(jìn)主體循環(huán)流動(dòng),提高釜內(nèi)整體湍動(dòng)程度,改善顆粒懸浮狀況；安放角θ=45°、層間距S=0.5T時(shí)可以適宜的功率獲得較強(qiáng)的軸向流動(dòng)和湍流脈動(dòng),有利于實(shí)現(xiàn)固相在釜內(nèi)的均布分布；流線型的碟形底結(jié)構(gòu)可以很好地順應(yīng)流體的運(yùn)動(dòng)方向,有效減小釜底的死區(qū)面積。內(nèi)構(gòu)件擋板的安裝可以有效消除流體的切向運(yùn)動(dòng),促進(jìn)釜內(nèi)形成整體軸向循環(huán)流動(dòng),同時(shí)發(fā)現(xiàn)釜內(nèi)增設(shè)四塊擋板,且擋板的離壁距離為3.4mm時(shí),顆粒的懸浮性能最優(yōu)。顆粒的直徑、密度以及體積濃度的增大均會(huì)降低固相在釜內(nèi)的懸浮均勻性,并且這種現(xiàn)象在粘度相對(duì)較低的流體中更加嚴(yán)重。此外還發(fā)現(xiàn),較之單層攪拌體系,雙層體系對(duì)固相粒徑和密度的變化更為敏感,但對(duì)固相體積濃度的變化適應(yīng)性更高。
[Abstract]:Solid-liquid heterogeneous reactions are widely used in chemical production. The dispersion state of solid phase in agitator plays a key role in the reaction process. In this paper, computational fluid dynamics (CFD) technique is used as a research tool. By using multiple reference system method and Euler multiphase flow model, the solid and liquid two-phase flow in a double-layer agitator is numerically simulated, and the structural parameters of the agitator are investigated respectively. The main conclusions of the paper are as follows: the synergy between the upper and lower layer blades can effectively promote the main circulating flow in the double-layer down-pressure inclined propeller, and the influence of the physical parameters of the inner member baffle and the system on the suspension performance of the particles is studied. Increasing the whole turbulence degree in the kettle and improving the particle suspension condition, the proper power can be obtained when the angle 胃 is 45 擄and the interval between layers is 0.5 T, which is advantageous to realize the uniform distribution of the solid phase in the kettle. The streamline disc bottom structure can conform to the direction of the fluid movement and reduce the dead zone area of the bottom of the kettle effectively. The installation of the inner member baffle can effectively eliminate the tangential movement of the fluid and promote the formation of the integral axial circulation flow in the kettle. At the same time, it is found that the suspension performance of the particles is optimal when four baffles are added in the kettle and the distance from the wall of the baffle is 3.4 mm. The increase of the diameter, density and volume concentration of the particles will reduce the suspension uniformity of the solid phase in the kettle. Moreover, the phenomenon is more serious in the fluid with relatively low viscosity. In addition, it is found that the two-layer system is more sensitive to the change of particle size and density than the single-layer mixing system, but more adaptable to the change of solid volume concentration.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ027

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