Modelling and simulation of flow maldistribution in random packed columns with gas-liquid countercurrent flow

macroscopic model, based on the volume-averaged equations of momentum and c ontinuity, is presented to predict hydrodynamic characteristics of gas and liquid countercurrent flow in random packed columns. The main advantage of this approach is that the model equations derived from the mass and momentu m conversation laws will remain valid on a wider range of length scale, fro m laboratory to industrial size packed columns. Therefore they can be used as basic tool for more rigorous design and scale up of packed columns. In t his study, the large-scale liquid maldistribution was simulated using the p roposed model for a 0.6-m diameter column packed with 25 min stainless stee l Pall rings. The development of liquid flow patterns along the packed heig ht was obtained for several different initial distributions of liquid phase . Furthermore, the effect of liquid and gas loads on the liquid distributio n was examined. The simulation results are in good agreement with the exper imental data obtained in our laboratory for both water/air and isopar/air s ystems.