Microwave-induced heating behavior of Y-TZP ceramics under multiphysics system

Kaihui Cui,Tianqi Liao,Hua Chen,Junwen Zhou,Chen Qiu

doi:10.1515/gps-2020-0013

Kaihui Cui, Tianqi Liao + Show 3 more

Open Access

https://doi.org/10.1515/gps-2020-0013

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Abstract

AbstractThis paper aims to investigate the heating behaviors of Y-TZP arrays under microwave irradiation. In this study, a three-dimensional numerical model of the microwave heating system was developed by COMSOL Multiphysics software. The numerical model was verified by microwave heating experiment, and the average root means square errors (RMSE) between the simulation and experimental data also confirmed the reliability of the model. The varying position and arrays of materials were applied to predict and visualize the three-dimensional distribution of the electromagnetic field and temperature during the microwave heating process. The results show that the temperature field distribution in microwave cavity was highly sensitive to the dielectric materials, the arrangement of the Y-TZP array interfered with the distribution of standing waves. The results can serve as references for the study to design and optimize the ceramic’s application in terms of microwave heating.

Highlights

HRettcpesi:v/e/ddoAiu.ogrugs/t1016.1,521051/9g;pas-c2c0ep20te-d00O1c3tobert2h2e, r2e01e9x. ists an automorphism of the is unique, and called the duality A endomorphism algebra of V ↔ A∗
In this paper, using COMSOL Multiphysics software simulated the microwave heating the array of Y-TZP, the numerical coupled electromagnetic and heat transfer equations were successfully solved
This model was verified by the microwave heating experiment and the average root means square errors, and the simulated temperature obtained has a good agreement with the experimental data

Summary

Geometric model

The microwave heating system in this work is designed and fabricated by the Key Laboratory of Unconventional Metallurgy of the Ministry of Education, Kunming University of Science and Technology (Figure 1). Y-TZP ceramics applied according to Eq 5 This equation coupled the electromagnetic heating module of COMSOL with those of the heat transfer by Fourier’s energy balance equation as follows:. The heat source (Q) in Eq 5 represents the electromagnetic losses (Ql), due to an electrical and magnetic field and is given by Ref. Copperb Airb where the resistive losses (Qrh) is given by: Relative permittivity Relative permeability Electrical conductivity. A perfect electrical conductor boundary condition was defined for the microwave cavity walls and waveguide, whereas the perfect magnetic conductor boundary condition (n × H = 0) assigned for the symmetry boundaries. The symmetry boundary considers that there is no heat flux across the boundary and that the boundaries are thermally well insulated which is defined by the following equation: this paper, free tetrahedral mesh element selected for the whole geometry. It can be clearly found that the quality of the model unit is satisfactory, and the model is considered to be reliable

Material

Mesh size

Effect of global total cumulative energy

Effect of a missing array element of the sample

Equivalent circuit analysis

Conclusions