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Tut 19 Dpm Channel

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  Tutorial: Modeling Evaporation of Liquid Droplets in aCircular Channel  Introduction The purpose of this tutorial is to simulate cooling of a hot air stream by water injectionusing species transport and discrete phase models of   ANSYS FLUENT  13.0. Prerequisites This tutorial is written with the assumption that you have completed Tutorial 1 from the ANSYS FLUENT  13.0 Tutorial Guide, and that you are familiar with the  ANSYS FLUENT navigation pane and menu structure. Some steps in the setup and solution procedure willnot be shown explicitly. Problem Description The problem to be considered is shown in the Figure 1. Hot air enters through the inletof a 3D circular pipe. Water droplets are injected at various axial and radial locations bycreating Discrete Phase Model injections. Water undergoes a phase change as it comes incontact with hot air, and the mixture of air and vapor flows downstream.The solution will be performed in two stages:1. Converge the flow without DPM (no evaporation).2. Start DPM injection and solve the actual phase change problem. c  ANSYS, Inc. March 7, 2011  1  Modeling Evaporation of Liquid Droplets in a Circular Channel  Injection locations are shown by small arrows. Figure 1: Schematic of the cooling system Preparation 1. Copy the mesh file,  3dpipe.msh.gz  to the working folder.2. Use  FLUENT Launcher  to start the ( 3D ) version of   ANSYS FLUENT . For more information about   FLUENT Launcher  see Section   1.1.2 Starting ANSYS FLU-ENT Using FLUENT Launcher  in the   ANSYS FLUENT  13.0 User’s Guide. 3. Enable  Double-Precision  in the  Options  list. Note:  The   Display Options  are enabled by default. Therefore, after you read in the mesh, it will be displayed in the embedded graphics window. 2   c  ANSYS, Inc. March 7, 2011  Modeling Evaporation of Liquid Droplets in a Circular Channel  Setup and Solution Step 1: Mesh 1. Read the mesh file,  3dpipe.msh.gz . File −→ Read −→ Mesh... As the mesh file is read,  ANSYS FLUENT  reports the progress in the console. Figure 2: Mesh Display Step 2: General Settings 1. Retain the default settings. General c  ANSYS, Inc. March 7, 2011  3   Modeling Evaporation of Liquid Droplets in a Circular Channel  2. Check the mesh. General −→ CheckANSYS FLUENT  performs various checks on the mesh and reports the progress in the console. Pay attention to the minimum volume reported and make sure this is a positive number. Scaling is not required for this case. Step 3: Models 1. Enable the  Energy Equation . Models −→  Energy −→ Edit... 2. Select the realizable  k-epsilon  viscous model. Models −→  Viscous −→ Edit... 4  c  ANSYS, Inc. March 7, 2011
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