Step 11: Make the Reflector Completely Diffuse

1.   Read in the case and data files ( do_3x3_3x3_div.cas.gz and do_3x3_3x3_div.dat.gz).

2.   Increase the diffuse fraction for reflector.

Boundary Conditions reflector Edit...

(a)   Click the Radiation tab and enter 1 for Diffuse Fraction.

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

3.   Request another 1000 iterations.

Run Calculation

  The solution will converge in approximately 80 additional iterations.

4.   Plot the temperature profiles after increasing the diffuse fraction for the reflector.

Plots XY Plot Set Up...

(a)   Save the file as do_3x3_3x3_div_df=1.xy.

(b)   Save the case and data files as do_3x3_3x3_div_df1.cas.gz
and do_3x3_3x3_div_df1.dat.gz.

Figure 6.10: Temperature Profile for Higher Diffuse Fraction

  Radiation reflects from the reflector more diffusely causing more uniform (less localized) temperature at the lens. This also leads to lower maximum lens temperature.