TY - JOUR

T1 - Numerical simulation of temperature distributionin multi-phase materials as a result of selective heating by microwave energy

AU - Yoshikawa, Noboru

AU - Tokuyama, Yoshio

PY - 2009

Y1 - 2009

N2 - In order to discuss the temperature distributions due to microwave (MW) selective heating of multi-phase solids, numerical analysis was conducted. The simulation was performed assuming the dielectric heating mechanism in a dual phase solid in which one phase has much larger permittivity (loss factor) than the other. In addition, an electric (E-) field inside the solid was assumed to be homogeneous, the value of which was estimated by a macroscopic electromagnetic (EM) simulation of the solid body placed in a TE10 cavity. In this EM simulation, a single phase solid body having an averaged permittivity value of the dual-phase is assumed. Next, heat transfer calculations were performed in order to obtain the temperature distribution in the dual phase solid, assigning different permittivity values to the phases giving rise different heat source terms in the thermal conduction equation. The boundary conditions were either adiabatic or considering the thermal energy dissipation by radiation to obtain the realistic temperature in the model solid. It was shown that a larger temperature difference resulted in larger particle size. The model considering the temperature dependence of the permittivity predicted a largest temperature difference during several ten milli-seconds.

AB - In order to discuss the temperature distributions due to microwave (MW) selective heating of multi-phase solids, numerical analysis was conducted. The simulation was performed assuming the dielectric heating mechanism in a dual phase solid in which one phase has much larger permittivity (loss factor) than the other. In addition, an electric (E-) field inside the solid was assumed to be homogeneous, the value of which was estimated by a macroscopic electromagnetic (EM) simulation of the solid body placed in a TE10 cavity. In this EM simulation, a single phase solid body having an averaged permittivity value of the dual-phase is assumed. Next, heat transfer calculations were performed in order to obtain the temperature distribution in the dual phase solid, assigning different permittivity values to the phases giving rise different heat source terms in the thermal conduction equation. The boundary conditions were either adiabatic or considering the thermal energy dissipation by radiation to obtain the realistic temperature in the model solid. It was shown that a larger temperature difference resulted in larger particle size. The model considering the temperature dependence of the permittivity predicted a largest temperature difference during several ten milli-seconds.

KW - Heat transfer

KW - Microwave

KW - Multi phase material

KW - Numerical simulation

KW - Selective heating

KW - Temperature difference

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M3 - Article

AN - SCOPUS:79960304850

SN - 0832-7823

VL - 43

SP - 43127

EP - 43133

JO - Journal of Microwave Power and Electromagnetic Energy

JF - Journal of Microwave Power and Electromagnetic Energy

IS - 1

ER -