Coupled 3—D Finite Difference Time Domain and Finite Volume Methods for Solving Microwave Heating in Porous Media
Computational results for the microwave heating of a porous material are presented in this paper. Combined finite difference time domain and finite volume methods were used to solve equations that describe the electromagnetic field and heat and mass transfer in porous media. The coupling between the two schemes is through a change in dielectric properties which were assumed to be dependent both on temperature and moisture content. The model was able to reflect the evolution of temperature and moisture fields as the moisture in the porous medium evaporates. Moisture movement results from internal pressure gradients produced by the internal heating and phase change.
Unable to display preview. Download preview PDF.
- 2.Bear, J.: Dynamics of Fluids in Porous Media. Dover Publications, New York (1998)Google Scholar
- 3.Jia, X., Jolly, P.: Simulation of microwave field and power distribution in a cavity by a three dimensional finite element method. Journal of Microwave Power and Electromagnetic Energy 27 (1992) 11–22Google Scholar
- 4.Kent, M.: Electrical and Dielectric Properties of Food Materials. Science and Technology Publishers Ltd, England,(1987)Google Scholar
- 5.Metaxas, A.C., Meredith, R.J.: Industrial Microwave Heating. IEE Power Engineering Series, 4 (1983)Google Scholar
- 6.Monk, P.: Sub-Gridding FTDT Schemes. ACES Journal 11 (1996) 37–46Google Scholar
- 7.Monk, P., Suli, E.: Error estimates for Yee’s method on non-uniform grids. IEEE Transactions on Microwave Theory and Techniques 30 (1994)Google Scholar
- 10.PHOENICS code,CHAM ltd, Wimbledon (http://www.cham.co.uk)
- 12.Turner, I., Jolly, P..: The effect of dielectric properties on microwave drying kinetics. Journal of Microwave Power and Electromagnetic Energy 25 (1990) 211–223Google Scholar
- 13.Yee, K.S.: Numerical solution of initial boundary value problems involving Maxwell’s equations in isotropic media. IEEE Trans. Antennas Propag., 14 (1996) 302–307Google Scholar