Encyclopaedia Index

WORKSHOP - IMMERSOL Radiative Heat exchange in a duct flow

This workshop calculates the heat exchange in a duct flow with fixed wall temperatures. Two solid plates of different materials are placed in the duct.

The flow domain is shown below:-

Accessing PHOENICS-VR

From the system level:

To enter the PHOENICS-VR environment, click on the PHOENICS icon on the desktop, or click on Start, programs, PHOENICS, PHOENICS.

From the commander level:

To enter the PHOENICS-VR environment, click on the 'Run vre' icon in the left column.

In PHOENICS-VR environment,

Start with an 'empty' case - click on 'File' then on 'Start New Case', then on 'Core', then click on 'OK'; to confirm the resetting.

To enter VR Editor:

This is the default mode of operation .

Within VR Editor.

Set the domain size, and activate solution of the required variables:

Click on 'Main menu'

Set 'A duct flow (Immersol)' as the Title.

Click on 'Geometry'

Change the domain size under z-direction to 0.5 m

Change the Number of cells in the both x- and z-direction to 30

Click on 'OK' to close the Grid mesh settings dialog

Click on 'Models'

Click Energy Equation to ON, select Temperature and click on OK

Click on Turbulence models, select KEMODL and click on OK

 

Click Radiation models to ON and select IMMERSOL. Click on OK

Click on IMMERSOL settings and:-

Enter 1.0 for the Absorption coefficient

Switch the 'Store Radiative energy fluxes' to ON

Click on 'Previous panel'

Set material properties for the fluid

Click on 'Properties'.

Click on domain material dialogue box/Gases/OK/2 Air using Ideal Gas Law, STP/OK

Click on 'Top menu' and 'OK'

 

Click 'Reset' on the Movement control panel, then 'Fit to window' to re-scale the view to fit the geometry.

Create INLET object

Click on 'Settings', 'New' and 'New Object'. The Object specification dialog box will appear.

Change Name to Inlet

Click on 'Size' and set SIZE of Object as:

XSize: 0.0

YSize: 1.0

ZSize: 0.5

Click on 'General'.

Click on Type dialogue box and select INLET

Click on Attributes and enter 727 C for the Temperature, 1.0 m/s for the x- direction velocity. Click on OK/OK

Create OUTLET object

Click on 'Settings', 'New' and 'New Object'.

Change Name to Outlet

Click on 'Size' and set SIZE of object as:

XSize: 0.0

YSize: 1.0

ZSize: 0.5

Click on 'Place' and set POSITION of object as:

XPos: 1.0

YPos: 0.0

ZPos: 0.0

Click on 'General'.

Click on Type dialogue box and select OUTLET

Click on Attributes and set the external Temperature to 727 C

Click on OK/OK

Create Lower WALL object

Click on 'Settings', 'New' and 'New Object'.

Change Name to Walll

Click on 'Size' and set SIZE of object as:

XSize: 1.0

YSize: 1.0

ZSize: 0.0

Click on 'General'.

Click on Type dialogue box and select PLATE

Click on Attributes.

Click on 'Adiabatic', and select 'Surface temperature', 'OK'. Set the surface temperature value to 727.

Set the emissivity to 0.9/OK

Click on OK

Create upper WALL object by duplication from lower wall

Click on the 'Duplicate object' button and then 'OK'

Use the Z Position button to move the duplicated object to the top of the domain.

Click on the object

Change the name to Wallh.

Click on Attributes, and set the surface temperature to 2227.

Click on OK/OK

Create upper internal blockage

Click on 'Settings', 'New' and 'New Object'.

Change Name to PLT1

Click on 'Size' and set SIZE of object as:

XSize: 0.4

YSize: 1.0

ZSize: 0.02

Click on 'Place' and set POSITION of object as:

XPos: 0.3

YPos: 0.0

ZPos: 0.35

Click on 'General'.

Click on Attributes.

Click on the Types dialogue box and select Solids/111 STEEL at 27 deg C/OK

Set emissivity to 0.9/OK

Click on OK

Create lower internal blockage by duplication from upper

Click on Duplicate object button and then 'OK'

Change the following to:

XPos: 0.3 ZPos: 0.13

double click on the duplicated object and change the name to PLT2

Click on Attributes.

Click on the Types Material dialogue box

Choose '103 COPPER at 27 deg C'/OK/OK

Click on 'OK' to close the object specification dialog box

Set remaining solution control parameters

Click on 'Main Menu'

Click on 'Initialisation'

Change FIINIT Value under TEM1 to 727

Click on 'Numerics'

Change 'Total number of iterations' to 200

Click on Top Menu/OK

Adjust the Monitoring Position to the center of the domain using the Z Position button.

Running the Solver.

In the PHOENICS-VR environment, click on 'Run', 'Solver'(Earth), and click on 'OK' to confirm running Earth.

Using the VR Viewer.

In the PHOENICS-VR environment, click on 'Run', 'Post processor',then GUI Post processor (VR Viewer) . Click 'OK' on the file names dialog to accept the default files.

To view:

To select the plotting variable:

To change the direction of the plotting plane, set the slice direction to X, Y or Z slice direction (927 bytes)

To change the position of the plotting plane, move the probe using the probe position buttons

probe position (927 bytes).

A typical plot from this case is:

Saving the results.

In the PHOENICS-VR environment, click on 'Save as a case', make a new folder called 'IMMERSOL ' (e.g.) and save as 'CASE1' (e.g.).