Maxblend搅拌桨在高粘性流体中的微观混合性能研究

Micro Mixing Performance of Maxblend Impeller in High Viscous Fluid

应用商用FLUENT软件包,采用多重参考系法,对Maxblend搅拌桨在多种不同类型流体中的混合性能进行数值模拟研究,得出搅拌槽内流体的速度分布特征和循环状况。结果表明,流体的高速流动区域很大,约占整个搅拌槽体积的70%左右;最大轴向速度出现在搅拌槽的中间横截面上(Z/H=0.5),最大无因次切向速度出现在液面处;在搅拌槽底部,流体主要进行轴向运动;不同类型流体的无因次轴向速度均随着搅拌雷诺数的增大而增大,随着流体特征指数的增大而减小;轴向和切向循环量数随流体特征指数有下降趋势。研究结果对搅拌装置的结构优化及Maxblend搅拌桨的广泛应用具有重要指导意义。

Commercial FLUENT software and the method of multiple reference frame meth- od were used to research on the numerical simulation of the Maxblend impeller in a variety of different types of fluid mixing performance, and the fluid velocity distribution and circula- tion condition within the agitation tank were examined. The results show that high-speed flow area of the fluid is very big, accounted for about 70% of the whole mixing tank or so. The maximum axial velocity is found in the middle of the cross section of the stirred tank （ Z/H = 0. 5 ）, and the largest dimensionless tangential velocity is found in liquid level. The fluid was mainly doing axial movement when being stirred at the bottom of tank. Non-di- mensional axial flow of different types of fluid increased with the rise of mixing Reynolds number, and decreased with the rise of the fluid characteristic index;Number of axial and tangential circulation with the fluid characteristics index has a downward trend. The study onthe structure optimization of mixing plant and Maxblend impeller has important guiding sig- nificance in more widespread application.