酯化反应搅拌釜内流动特性的数值模拟

文中在CFX-5.5.1软件平台上，采用多重参考系法和k-ε双方程湍流模型对带有导流筒及不同层数盘管换热器的搅拌槽内的流场进行了数值模拟。模拟以清水为物系，采用直径为0.5m的搅拌槽及5叶CBY螺旋桨。分别对盘管层数为0，4，14，16，18，20，22层的流场进行了数值模拟，计算了7种情况下的功率准数与循环流量准数，计算结果与实验数据基本一致。得到随盘管层数增加功率准数、循环流量准数的变化规律及各层盘管搅拌槽内叶轮的水力损失；并讨论了带0层盘管及带22层盘管搅拌槽中流场的变化。

Numerical simulation of flow field in a esterify-reactor with an agitator

The three-dimensional flow field in a stirred tank of 0.5m, equipped with a draft tube and a coil heat exchanger of different layers(0,4,14,16,18,20,22 layers), was simulated using a Multiple Frames of Reference(MFR)method based on a standard k-ε turbulent model with CFX5.5.1 code. A CBY propeller was used to pump the fluid (water) down. Results show that the predicted data are closely agreement with the experimental ones. The variations of the power number, flux number and the hydrodynamic loss of the propeller with increase in the number of coil layers were given, and the flow fields of the stirred tanks equipped with a heat exchanger between 0 layer and 22 layers of coil were compared. 