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Home / Examples / Coupled Analysis / Electromagnetic-Thermal Analysis [Hertz/Watt] / Example 1: Microwave Oven
Example 1: Microwave Oven
General
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The heating of a piece of meat on the bone placed in a microwave oven is simulated.
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It is solved by coupling the electromagnetic analysis with the thermal analysis.
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Unless specified in the list below, the default conditions will be applied.
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Obtain this session's project file. (Right-click and choose 'Save link as')
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Results will vary depending on Femtet version and the PC environment.
Analysis Space
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Item |
Settings |
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Analysis Space |
3D |
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Model Unit |
mm |
Analysis Conditions
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Item |
Settings |
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Solver |
Electromagnetic Analysis [Hertz] Thermal Analysis [Watt] |
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Analysis Type |
Electromagnetic Analysis: Harmonics Analysis Thermal Analysis: Steady-state Analysis |
Harmonic Analysis tab and Open Boundary tab are set as follows.
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Tab |
Setting Item |
Settings |
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Mesh |
Mesh Size |
20 |
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Element Type |
2nd-order Element |
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Adaptive Mesh |
Off (to shorten the calculation time) |
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Frequency-Dependent Meshing |
Reference Frequency: 2.45x109 [Hz] |
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Harmonic Analysis |
Frequency |
Minimum: 2.45x109 [Hz] Maximum: 2.45x109 [Hz] |
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Input |
10 [W] * |
* The power of actual microwave ovens is much higher than this.
The temperature distribution at steady state is analyzed in this example. Therefore, if the actual power is applied, the resulting temperature will be too high.
The input power is low to prevent it.
Model
A waveguide is placed on the top of a cavity box. A port is set at the end of the waveguide.
The meat on the bone is placed on a plate. The temperature of the bottom face of CAVITY is 20 [deg].
Body Attributes and Materials
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Body Number/Type |
Body Attribute Name |
Material Name |
Mesh Size |
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0/Solid |
CAVITY |
000_Air(*) |
|
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5/Solid |
WAVEGUIDE |
000_Air(*) |
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6/Sheet |
Imprinting body |
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13/Solid |
PLATE |
PLATE |
8 |
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75/Solid |
BONE |
BONE |
8 |
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96/Solid |
MEAT |
WATER |
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* Available from the material DB
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Material Name |
Tab |
Properties |
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PLATE |
Permittivity |
Relative Permittivity: 7.0 Dielectric Tangent: 0.0 |
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Thermal Conductivity |
1.5 [W/m/deg] |
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|
BONE |
Permittivity |
Relative Permittivity: 7.0 Dielectric Tangent: 0.1 |
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Thermal Conductivity |
1.5 [W/m/deg] |
|
|
WATER |
Permittivity |
Relative Permittivity: 76.7 Dielectric Tangent: 0.16 |
|
Thermal Conductivity |
1.5 [W/m/deg] |
Boundary Conditions
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
|
PORT1/Face |
Electric |
Port |
Reference Impedance:
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EW/Face |
Electric |
Electric Wall |
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20deg/Face |
Electric |
Electric Wall |
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Thermal |
Temperature |
20 [deg] |
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Outer Boundary Condition |
Electric |
Electric Wall |
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The default setting is [Magnetic Wall] for the electric boundary, and [Adiabatic] for the thermal boundary.
Results
The model is well heated overall.
