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Chapter 16: Modeling Evaporating Liquid Spray

This tutorial is divided into the following sections:

16.1.Introduction

16.2.Prerequisites

16.3.Problem Description

16.4.Setup and Solution

16.5.Summary

16.6.Further Improvements

16.1. Introduction

In this tutorial, the air-blast atomizer model in ANSYS Fluent is used to predict the behavior of an evaporating methanol spray. Initially, the air flow is modeled without droplets. To predict the behavior of the spray, the discrete phase model is used, including a secondary model for breakup.

This tutorial demonstrates how to do the following:

•Define a spray injection for an air-blast atomizer.

•Calculate a solution using the discrete phase model in ANSYS Fluent.

16.2. 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.

16.3. Problem Description

The geometry to be considered in this tutorial is shown in Figure 16.1: Problem Specification (p. 544). Methanol is cooled to C before being introduced into an air-blast atomizer. The atomizer contains an inner air stream surrounded by a swirling annular stream. To make use of the periodicity of the problem, only a section of the atomizer will be modeled.

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