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Calculation of Heating Patterns in Microwave Sintering using a 3D Finite-Difference Code

Published online by Cambridge University Press:  15 February 2011

James Tucker ,
Magdy F. Iskander  and
Zhenlong Huang
James Tucker
Affiliation:
Dept. of Elect. Eng., Univ. of Utah, Salt Lake City, UT 84112
Magdy F. Iskander
Affiliation:
Dept. of Elect. Eng., Univ. of Utah, Salt Lake City, UT 84112
Zhenlong Huang
Affiliation:
Dept. of Elect. Eng., Univ. of Utah, Salt Lake City, UT 84112
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Abstract

Analysis of heating patterns in microwave sintering experiments provide information on the contributions of the various heat transfer components to the overall temperature pattern. Measured temperature patterns provide limited information on overall effects. Numerical simulations provide a cost effective way from which the effect of geometry, material properties and the presence of stimulus such as SiC rods or sheets on the heating pattern can be studied separately. Parametric studies allow us to identify the most significant properties and provide guidelines for the routine successful utilization of microwave sintering experiments. These guidelines may also facilitate the scale up and commercialization of microwave sintering.

In this paper we describe a thermal model that calculates the temperature distribution in ceramic samples and insulation under realistic microwave sintering conditions. The calculation process involves a two-step procedure. The first step is to calculate the microwave power deposition in the sample and surrounding insulation. 3D FDTD calculations, described in a companion paper[1,2], are used for this purpose. The other step involves calculation of the temperature distribution using a 3D finite-difference heat-transfer program developed in our Departments[3]. Results illustrating the effect of thickness of insulation and the placement of SiC rod susceptors in picket-fence arrangement are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 347: Symposium O – Microwave Processing of Materials IV , 1994 , 353
Copyright
Copyright © Materials Research Society 1994

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References

REFERENCES

[1] Huang, Z., et al., “FDTD Modeling of Realistic Microwave Sintering Experiments”,Google Scholar
Huang, Z., et al., “FDTD Modeling of Realistic Microwave Sintering Experiments”Google Scholar
[2] Iskander, M. F., “Computer Modeling and numerical simulation of Microwave heating systems”, MRS Bulletin, volume XVIII, pp. 30–36, Nov. 1993 Google Scholar
[3] Tucker, J. M., ed al., “Dynamic Model For Calculating heating patterns during microwave sintering” Materials Research Society Symposium Proceedings, 269: pp. 61–67, April 1992 Google Scholar
[4] Siegel, R., Howell, J. R., Thermal Radiation Heat Transfer, pp. 267–268, 3rd ed. Hemisphere pub. corp.Google Scholar
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[6] Smith, R. L., et al., “Finite-Difference Time-Domain (FDTD) Simulation of Microwave Sintering in Multimode Cavities”, Materials Research Society Symposium Proceedings, 269: pp. 47–52, April 1992 Google Scholar
[7] Touloukian, Y. S., Dewitt, D. P. Thermal physical properties of matter, Volume 8, 1972 Plenum.Google Scholar