The Effect of Electric Field Distributions on Grains and Insect for Dielectric Heating Applications

This paper presents the effect of electric field
distribution which is an electric field intensity analysis. Consideration
of the dielectric heating of grains and insects, the rice and rice
weevils are utilized for dielectric heating analysis. Furthermore, this
analysis compares the effect of electric field distribution in rice and
rice weevil. In this simulation, two copper plates are used to generate
the electric field for dielectric heating system and put the rice
materials between the copper plates. The simulation is classified in
two cases, which are case I one rice weevil is placed in the rice and
case II two rice weevils are placed at different position in the rice.
Moreover, the probes are located in various different positions on
plate. The power feeding on this plate is optimized by using CST EM
studio program of 1000 watt electrical power at 39 MHz resonance
frequency. The results of two cases are indicated that the most
electric field distribution and intensity are occurred on the rice and
rice weevils at the near point of the probes. Moreover, the heat is
directed to the rice weevils more than the rice. When the temperature
of rice and rice weevils are calculated and compared, the rice weevils
has the temperature more than rice is about 41.62 Celsius degrees.
These results can be applied for the dielectric heating applications to
eliminate insect.

• S. Santalunai
• T. Thosdeekoraphat
• C. Thongsopa

• Copper plates
• Electric field distribution
• Dielectric heating.

[1] H. Sarnago, O. Lucia, A. Mediano, and JM. Burdio, "Class-D/DE Dual-
Mode-Operation Resonant Converter for Improved-Efficiency Domestic
Induction Heating System,” IEEE Transactions on Power Electronics,
vol. 28,pp. 1274-1285. 2013.
[2] M. Lichan, K.W.E. Cheng, and W.C. Ka, "Systematic Approach to
High-Power and Energy-Efficient Industrial Induction Cooker System:
Circuit Design, Control Strategy, and Prototype Evaluation,” IEEE
Transactions on Power Electronics, vol. 26,pp. 3754 - 3765.
[3] N.A. Ahmed, "High-Frequency Soft-Switching AC Conversion Circuit
With Dual-Mode PWM/PDM Control Strategy for High-Power IH
Applications,” IEEE Transactions on Industrial Electronics, vol. 58, pp.
1440 - 1448. 2011.
[4] H. Oka, S. Uchidate, N. Sekino, Y. Namizaki, K. Kubota, H. Osada, F.P.
Dawson, and J.D. Lavers, "Electromagnetic Wave Absorption
Characteristics of Half Carbonized Powder-Type Magnetic Wood,”
IEEE Transactions on Magnetics, vol. 47 pp. 3078-3070. 2011.
[5] K. Myungsik, and K. Kwangsoo, "Development of a compact cylindrical
reaction cavity for a microwave dielectric heating system,”Review of
Scientific Instruments, vol. 83 pp.1. 2012.
[6] C. Li, J. Wang, and J. Zhu, "Experiment and Theoretical Study on
Thermal Performance of Honeycomb Ceramic Regenerative Heat
Exchanger,” Power and Energy Engineering Conference (APPEEC)
Asia-Pacific, pp. 1-6. 2010.
[7] M. Granada, and W. Ferney, "Experimental prototype for endogenous
drying wood by radio frequency (RF),”. Alternative Energies and
Energy Quality (SIFAE), International Symposium on IEEE, pp. 1-8.
2012.
[8] A. Bayrashev, and B. Ziaie, "Silicon wafer bonding with an insulator
interlayer using RF dielectric heating, Micro Electro Mechanical
Systems,” The Fifteenth, International Conference on IEEE, vol. 419-
422. 2002.
[9] G. Jeffrey, 2012. "Characterization of Thermosetting Polymers.” How to
Get More Out of Your Rheometer-Part Three
[10] S.O. Nelson, 2006. "Agricultural applications of dielectric
measurements,” IEEE Transactions on Dielectrics and Electrical
Insulation, vol. 13, pp. 688-702. 2006.
[11] S. O. Nelson, "Dielectric properties of agricultural products
Measurements and Applications,” IEEE Trans. Elect. Insul, vol. 26, pp.
845-869. 1991.
[12] V. Komarov, "Dielectric and Thermal Properties of Materials at
Microwave Frequencies,” Handbook, Artech House. 2012.
[13] S. Wang, J. Tang, J.A. Johnson, E. Mitcham, J.D. Hansen, G. Hallman,
S.R. Drake, and Y. Wang, "Dielectric Properties of Fruits and Insect
Pests as related to Radio Frequency and Microwave Treatments,”
Biosystems Engineering, vol. 85, pp. 201-212. 2003.