4.5.3    Examples

Let us consider two examples of a microwave oven with cutlet load placed on a shelf:

• first one with no additional heater – available in .../QW-3D/BHM/Heat_radiation/heat_no_radiation.pro

• second one, with additional 500^oC heater placed on the top of the microwave oven – available in .../QW-3D/BHM/Heat_radiation/heat_radiation_500C.pro

Microwave oven with cutlet load placed on a shelf – additional heater at the top.

Proceeding to practical use of the radiative heat transfer condition, the definition of the radiative conditions for energy flow between two walls is performed with the use of heat_radiation_500C.rf3 file, which must take the following form:

! Quick Wave Radiation Heat Flow Modules ver. 1.0

! number of walls 2

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! wall/medium/orientation/emiss/geometry beef  PLUS 1.0 83.5 183.5 85. 185. 31. 31.

! wall/medium/orientation/emiss/geometry upper  MINUS 1.0 50. 220. 50. 220. 188. 188.

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Temperature distribution across cutlet load: project without additional heater (left) and with additional heater at the top (right).

From the results obtained for the two considered cases, it can be clearly seen that, as intuitively expected, in scenario where radiative heat transfer is included, the top of the culet is seared as it is additionally heated by the heater.

Simulation Log for the last BHM step: project without additional heater (left) and with additional heater at the top (right) – additional Radiation Heat Flow process applied.