﻿ Microwave OvenExamples | Product | Murata Software Co., Ltd.

# Example1Microwave Oven

### General

• The heating of a piece of meat on the bone placed in a microwave oven is simulated.

• It is solved by cascading the electromagnetic waves analysis and the thermal analysis.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

 Item Settings Solver Electromagnetic Analysis [Hertz] Thermal Analysis [Watt] Analysis Type Electromagnetic waves analysis: Harmonics analysis Thermal analysis: Steady-state analysis Options Select “Ignore the influence of face/edge electrode thickness” *

* This is the default setting. There are no face electrodes with this model. Therefore it is irrelevant to select it or not.

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Mesh tab, Harmonic analysis tab and Open boundary tab are set as follows.

 Tabs Setting Item Settings Mesh Mesh Size 20 Element type 2nd-order element Adaptive mesh Off (to shorten the calculation time) Frequency-Dependent Meshing Reference frequency: 2.45×10^9[Hz] Harmonic analysis Frequency Minimum: 2.45×10^9[Hz] Maximum: 2.45×10^9[Hz] Input 10[W] *

* The power of actual microwave ovens is much higher than this.

The temperature distribution at steady state is analyzed in this exercise. 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. An I/O 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

 Body Number/Type Body Attribute Name Material Name Mesh Size 0/Solid CAVITY 000_Air(*) 5/Solid WAVEGUIDE 000_Air(*) 6/Sheet Imprinting body 13/Solid PLATE PLATE 8 75/Solid BONE BONE 8 96/Solid MEAT WATER

* Available from the Material DB

 Material Name Tab Properties PLATE Permittivity Relative Permittivity: 7.0 tanD: 0.0 Thermal Conductivity 1.5[W/m/deg] BONE Permittivity Relative permittivity: 7.0 tanD: 0.1 Thermal Conductivity 1.5[W/m/deg] WATER Permittivity Relative Permittivity: 76.7 tanD: 0.16 Thermal Conductivity 1.5[W/m/deg]

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings PORT1/Face Electric I/O Port Reference Impedance: Select “Use the characteristic impedance calculated from the port structure”. EW/Face Electric Electric wall 20deg/Face Electric Electric wall Thermal Temperature 20[deg] Outer Boundary Condition Electric Electric wall

The default settings are “Magnetic wall” and “Adiabatic” for the electric and thermal boundary conditions respectively.

### Results

The model is well heated overall.

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