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Chapter 21: Using the Eulerian Granular Multiphase Model with Heat Transfer

This tutorial is divided into the following sections:

21.1.Introduction

21.2.Prerequisites

21.3.Problem Description

21.4.Setup and Solution

21.5.Summary

21.6.Further Improvements

21.7.References

21.1. Introduction

This tutorial examines the flow of air and a granular solid phase consisting of glass beads in a hot gas fluidized bed, under uniform minimum fluidization conditions. The results obtained for the local wall- to-bed heat transfer coefficient in ANSYS Fluent can be compared with analytical results [1].

This tutorial demonstrates how to do the following:

•Use the Eulerian granular model.

•Set boundary conditions for internal flow.

•Compile a User-Defined Function (UDF) for the gas and solid phase thermal conductivities.

•Calculate a solution using the pressure-based solver.

21.2. Prerequisites

This tutorial is written with the assumption that you have completed one or more of the introductory tutorial Fluid Flow and Heat Transfer in a Mixing Elbow (p. 35) found in this manual and that you are familiar with the ANSYS Fluent tree and ribbon structure. Some steps in the setup and solution procedure will not be shown explicitly.

In order to complete the steps to compile the UDF, you will need to have a working C compiler installed on your machine.

21.3. Problem Description

This problem considers a hot gas fluidized bed in which air flows upwards through the bottom of the domain and through an additional small orifice next to a heated wall. A uniformly fluidized bed is examined, which you can then compare with analytical results [1]. The geometry and data for the problem are shown in Figure 21.1: Problem Schematic (p. 716).

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