Step 5: Boundary Conditions

Boundary Conditions

1.   Set the boundary conditions for the front wall ( w-high-x).

Boundary Conditions w-high-x Edit...

(a)   Click the Thermal tab and select Mixed in the Thermal Conditions group box.

(b)   Select insulation from the Material Name drop-down list.

(c)   Enter 5  ${\rm W/m}^{2}-K$ for Heat Transfer Coefficient.

(d)   Enter 293.15 K for both Free Stream Temperature and External Radiation Temperature.

(e)   Enter 0.75 for External Emissivity.

(f)   Enter 0.95 for Internal Emissivity.

(g)   Enter 0.05 m for Wall Thickness.

(h)   Click OK to close the Wall dialog box.

2.   Copy boundary conditions to define the side walls w-high-z and w-low-z.

Boundary Conditions Copy...

(a)   Select w-high-x from the From Boundary Zone selection list.

(b)   Select w-high-z and w-low-z from the To Boundary Zones selection list.

(c)   Click Copy.

  A Warning dialog box will open, asking if you want to copy the boundary conditions of w-high-x to w-high-z and w-low-z.

(d)   Click OK in the Warning dialog box.

(e)   Close the Copy Conditions dialog box.

3.   Set the boundary conditions for the heated wall ( w-low-x).

Boundary Conditions w-low-x Edit...

(a)   Click the Thermal tab and select Temperature in the Thermal Conditions group box.

(b)   Retain the default selection of aluminum from the Material Name drop-down list.

(c)   Enter 473.15 K for Temperature.

(d)   Enter 0.95 for Internal Emissivity.

(e)   Click OK to close the Wall dialog box.

4.   Set the boundary conditions for the top wall ( w-high-y).

Boundary Conditions w-high-y Edit...

(a)   Click the Thermal tab and select Mixed in the Thermal Conditions group box.

(b)   Select insulation from the Material Name drop-down list.

(c)   Enter 3  ${\rm w/m}^{2}-K$ for Heat Transfer Coefficient.

(d)   Enter 293.15 K for both Free Stream Temperature and External Radiation Temperature.

(e)   Enter 0.75 for External Emissivity.

(f)   Enter 0.95 for Internal Emissivity.

(g)   Enter 0.05 m for Wall Thickness.

(h)   Click OK to close the Wall dialog box.

5.   Copy boundary conditions to define the bottom wall ( w-low-y).

Boundary Conditions Copy...

(a)   Select w-high-y from the From Boundary Zone selection list.

(b)   Select w-low-y from the To Boundary Zones selection list.

(c)   Click Copy.

  A Warning dialog box will open, asking if you want to copy the boundary conditions of w-high-y to w-low-y.

(d)   Click OK in the Warning dialog box.

(e)   Close the Copy Conditions dialog box.