酶膜反应器流动特性及膜污染演化的三维数值研究
Three-dimensional numerical study of flow characteristic and membrane fouling evolution in an enzymatic membrane reactor
摘要：
为了加深对膜污染机理的认识，本文对搅拌酶膜反应器中颗粒流的流体力学特性进行了数值模拟研究。采用三维Euler-Euler模型，耦合k-e混合湍流模型和用于相间动量交换的阻力函数，对流固两相湍流流动进行了数值模拟。对不同搅拌速度下的单相和两相湍流流动进行了数值模拟。数值计算结果与已发表的实验数据吻合得很好。给出了速度、切应力和湍流动能的分布。结果表明，提高搅拌速度不仅可以扩大反应器内的循环回路，而且可以增加膜表面的剪切应力，加速颗粒物料的混合过程。膜表面颗粒物体积函数随时间的演化定性地解释了膜污染的演化过程。
英文摘要：
In order to enhance the understanding of membrane fouling mechanism, the hydrodynamics of granular flow in a stirred enzymatic membrane reactor was numerically investigated in the present study. A three-dimensional Euler-Euler model, coupled with k-e mixture turbulence model and drag function for interphase momentum exchange, was applied to simulate the two-phase (fluid-solid) turbulent flow. Numerical simulations of single- or two-phase turbulent flow under various stirring speed were implemented. The numerical results coincide very well with some published experimental data. Results for the distributions of velocity, shear stress and turbulent kinetic energy were provided. Our results show that the increase of stirring speed could not only enlarge the circulation loops in the reactor, but it can also increase the shear stress on the membrane surface and accelerate the mixing process of granular materials. The time evolution of volumetric function of granular materials on the membrane surface has qualitatively explained the evolution of membrane fouling.
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