FLUENT流化床模拟实例

Tutorial: Using the Eulerian Multiphase Model w ith SpeciesTransportIntrodu ctionFluidized beds are used in processes where gas/solid mass transfer is of importance. The de-composition of ozone (O3), using particles as a catalyst, creates a suitable low-temperatureenvironment for mass transfer. This tutorial solves a gas/solid flow with a simple one-stepozone decomposition reaction in a fluidized bed.The reaction equation isO3 → 1.5O2(1)This tutorial demonstrates how to do the following:•Use the granular Eulerian multiphase model with species transport.•Define the rate of reaction with a user-defined function (UDF).•Define the Syamlal-O’Brien drag correlation with a user-defined function (UDF) usingappropriate parameters.•Set boundary conditions for internal flow.•Define the fluid and solid phases.•Calculate a solution using 2D planar geometry in conjunction with the pressure-basedsolver.•Solve a time-accurate transient problem with data sampling for time statistics.Prerequ isitesThis tutorial assumes that you are familiar with the FLUENT interface and that you have agood understandingof basic setup and solution procedures. Some steps will not be shownexplicitly.In this tutorial you will use the Eulerian multiphase model with species transport. If youhave not used this feature before, refer to the FLUENT 6.3 User’s Guide.cFlu ent Inc. October 30, 20061Using the Eulerian Multiphase Model w ith Species TransportProblem DescriptionThe problem involves the transient startup of ozone decomposition in a fluidized bed. Thefluid phase is a mixture of ozone and air, while the solid phase consists of sand particleswith an 87.75 micron diameter. A schematic of the fluidized bed is shown in Figure 1. Thedomain is modeled as a...