CFD modeling of flow patterns and hydraulics of commercial-scale sieve trays

摘要

A computational fluid dynamics (CFD) model was used to predict the lfow patterns and hydraulics of a commercial-scalesieve tray. The model considers the 3-D two-phase flow of gas andliquid in which each phase is treated as an interpenetrating continuum haivng separate transport equations. Interaction between the two phases occurs via an interphase momentum transfer. For the CFD analysis,the commercial packages CFX5.4 and CFX4.4 of AEA Technology were employed. Velocity distributions,clear liquid height,froth height,and liquid holdup fraction in froth were predicted for various combinations of gas and liquid flow rates. Tray geometry and operation conditions were based on the experimental work that Solari and Bell carried out in a 1.22-m diameter air-water simulator in 1986 at Fractionation Research Inc. Predicted results were found to be in good agreement with the experimental data of these authors. The objective of which CFD can be used as a prediction and designtool for industrial trays. The simulation results aresuch that CFD can be used as an invaluable tool in tray design and analyis.