Dusko D. Dincov
ABSTRACT
Computational results for the microwave heating patterns in singlefed multimode empty and loaded cavities are presented in this paper. Combined Finite Difference Time Domain (FDTD) and Finite Volume (FV) methods are used to solve the equations that describe the electromagnetic field and heat transfer in the processed samples. The coupling between the two schemes is through a change in dielectric properties which are assumed to be temperature dependent. The model takes into account the changing effect of the load's properties on the electric field and modal patterns. A study of the modes and their corresponding field pattern inside a resonant cavity is presented computationally using the FDTD solver. The coupled algorithm is then used to investigate heat distribution by observing the occurrence of resonant conditions which are responsible for achieving high heating levels.
- K. G. Ayappa, H. T. Davis, G. Crapiste, E. A. Davis, and J. Gordon. Microwave heating: An evaluation of power formulations. Chemical Engineering Science, 46:1005--1016, 1991.Google Scholar
Cross Ref
- M. Chamchong and A. K. Datta. Thawing of food in a microwave oven: Ii.effect of load geometry and dielectric properties. Journal of Microwave Power and Electromagnetic Energy, 34(1):22--31, 1999.Google ScholarCross Ref
- T. V. C. T. Chan and H. C. Reader. Understanding microwave heating cavities. Artech House, London, 2000.Google Scholar
- M. Clemens and C. Saltiel. Numerical modeling of materials processing in microwave furnaces. International Journal of Heat and Mass Transfer, 39(8):1665--1675, 1996.Google ScholarCross Ref
- A. K. Datta and R. C. Anantheswaran. Handbook of Microwave Technology for Food Applications. Marcel Dekker, New York, 2001.Google ScholarCross Ref
- D. Dincov. Coupled cem/cfd approach to solving microwave heating in porous media. University of Greenwich, London, June 2002.Google Scholar
- D. Dincov, K. Parrott, and K. Pericleous. Coupled 3-d finite difference time domain and finite volume methods for solving microwave heating in porous media. Lecture Notes in Computer Science, 2329(1):813--822, 2002. Google ScholarDigital Library
- A. C. Metaxas and R. J. Meredith. Numerical Heat Transfer and Fluid Flow. McGraw-Hil, London, 1983.Google Scholar
- S. V. Patankar. Numerical heat transfer and fluid flow. Hemisphere Publishing Corporation, 1980.Google Scholar
- K. S. Yee. Numerical solution of initial boundary values probelems involving maxwell's equations in isotropic media. IEEE Trans.Antennas Propag., 14:302--307, 1966.Google ScholarCross Ref
- Computational analysis of microwave heating patterns in resonant multimode cavities
Recommendations
Finding resonant frequencies for high loss dielectrics in cylindrical cavities
This article proposes the use of argument principle method APM to find all complex resonant frequencies in a three layer cylindrical cavity. APM guarantees that no root is lost and frequencies can be associated with the resonant mode. The roots can be ...
Mitigating Thermal Focusing in Microwave Heating of Cylindrical Loads by Resonant Rings
Cylindrical loads are commonly found in microwave heating. However, cylindrical loads tend to have a thermal focus, leading to uneven microwave heating. In this paper, a novel microwave heating method was proposed by employing resonant rings to mitigate ...
Comments