CFD Research on the Influence of 45° Disk Turbine Agitator Blade Diameter on the Solid–Liquid Mixing Characteristics of the Cone-Bottom Stirred Tank
CFD Research on the Influence of 45° Disk Turbine Agitator Blade Diameter on the Solid–Liquid Mixing Characteristics of the Cone-Bottom Stirred Tank
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DOI：
10.1007/s13369-020-04528-0
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发表时间：
2020-07
影响因子：
2.9
通讯作者：
Huiling Jia;Feng Wang;Jinxiu Wu;X. Tan;Mei Li
中科院分区：
文献类型：
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作者：
Huiling Jia;Feng Wang;Jinxiu Wu;X. Tan;Mei Li
采用计算流体力学（CFD）方法对直径D = 150 mm的锥底搅拌槽内固液混合物浓度场进行了数值模拟。分析了45°圆盘涡轮机叶轮直径对固液混合时间、单位体积混合能、浓度标准差、湍动能和湍动能耗散率以及固体悬浮转速的影响。采用欧拉双流体模型和标准k-ε湍流模型对锥底搅拌槽内的固液两相湍流流动进行了沿着模拟。采用多重参考系方法对全挡板反应器中的叶轮旋转进行了数值模拟。采用Fluent®14.5商业CFD软件进行瞬态模拟。将叶轮外边缘处沿叶片宽度沿着的径向和切向速度与Wu和Patterson（Chem Eng Sci 44：2207-2221，1989）、Mahouast等人（Entropy 133：7-17，1987）和Kemoun等人（IChemE Symp Ser 136：399-406，1994）的实验数据进行比较。进一步扩展的计算模型可以很好地预测叶轮直径对固液混合特性的影响。
A numerical simulation of a solid–liquid mixture concentration field in a cone-bottom stirred tank (diameterD= 150 mm) was conducted using computational fluid dynamics (CFD). The influence of the 45° disk turbine impeller diameter on the mixing time number of solid–liquid mixture, mixing energy per unit volume, concentration standard deviation, turbulence energy and turbulent dissipation rate as well as solid just-suspended impeller speed was analyzed. The Eulerian two-fluid model was employed along with the standardk–εturbulence model to simulate the turbulent solid–liquid flow in the cone-bottom stirred tank. A multiple reference frame approach was used to simulate the impeller rotation in a fully baffled reactor. The Fluent®14.5 commercial CFD software was employed for the transient simulation. The radial and tangential velocities at the outer edge of the impeller along the blade width were compared with the experimental data of Wu and Patterson (Chem Eng Sci 44:2207–2221, 1989), Mahouast et al. (Entropy 133:7–17, 1987) and Kemoun et al. (IChemE Symp Ser 136:399–406, 1994). The further extended computational model could well predict the influence of impeller diameter on the solid–liquid mixing characteristics.