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Modeling and of Evaporating Liquid Spray Using ANSYS

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.

This tutorial is written with the assumption that you have completed one or more of the introductory tutorials found in this manual:
• Introduction to Using ANSYS FLUENT in ANSYS Workbench: Fluid Flow and Heat Transfer in a Mixing Elbow
• Parametric Analysis in ANSYS Workbench Using ANSYS FLUENT
• Introduction to Using ANSYS FLUENT: Fluid Flow and Heat Transfer in a Mixing Elbow
and that you are familiar with the ANSYS FLUENT navigation pane and menu structure. Some steps in the setup and solution procedure will not be shown explicitly.

Problem Description

The geometry to be considered in this tutorial is shown in figure below. Methanol is cooled to −10 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 o section of the atomizer will be modeled.

Summery

In this tutorial, a spray injection was defined for an air-blast atomizer and the solution was calculated using the discrete phase model in ANSYS FLUENT. The location of methanol droplet particles after exiting the atomizer and an iso-surface of the methanol mass fraction were examined. This tutorial guides you through the steps to reach an initial solution. You may be able to obtain a more accurate solution by using an appropriate higher-order discretization scheme and by adapting the mesh. Mesh adaption can also ensure that the solution is independent of the mesh.

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