Youichi Kakuta

Analytical and Experimental Examination of Defrosting Spots of Heated Frozen Material in a Microwave Oven

In this paper, temperature distribution of heated material (a frozen tuna) in a microwave oven is calculated by the method which combines FDTD for electromagnetic field calculation with heat transport equation considering melting heat and the nonlinear and rapid change of complex relative permittivity and heat conductivity during defrosting. As a result, the calculated temperature distribution of heated material agrees well with the measured one, and the validity of the combined method considering melting heat and the change of complex relative permittivity and heat conductivity is confirmed

Analysis of Absorbing Characteristics of One-Layer EM-Absorber Using CIP Method

In this paper, Constrained Interpolation Profile (CIP) method is applied to Maxwells equation including complex permittivity and permeability and the validity of CIP method applied to the equation is confirmed compared with the FDTD method. And the dependency on CFL (Courant-Friedrich-Lewy) condition, cell size and estimates of ∂e ∂x, ∂μ ∂x and ∂σ ∂x of the absorbing characteristics of one-layer EM-absorber are calculated using CIP method and compared with that by FDTD method. As a result, it is confirmed that the characteristics obtained by CIP method is different from that by FDTD method.

Analysis of electromagnetic field using CIP method and its application of one-layer wave absorber

In this paper, constrained interpolation profile (CIP) method is applied to Maxwells equation and the validity of CIP method applied to the equation is confirmed compared with the FDTD method. And as the one of its application, the dependency on CFL (Courant-Friedrich-Lewy) condition and the finite difference accuracy of non advection equation of the absorbing characteristics of one-layer EM-absorber are calculated using CIP method. As a result, it is confirmed that the accuracy of CIP method has a large dependency upon CFL condition and when the value (CFL) is 0.253, the best accuracy is obtained in the absorption characteristics calculation

Study of Uneven Heating of a Heated Material in a Microwave Oven Considering Air Convection and Heat Radiation

In this paper, uneven temperature distribution of a heated material is computed by the coupled method. The coupled method can calculate electromagnetics, and all of the heat transmission phenomena of heat conduction, heat transfer by air convection, and heat radiation. The calculated temperature distribution at the surface of the material is compared with the measured one. As a result, the tendency of the calculated and measured temperature distributions agrees well. The validity of the proposed method on this kind of problem is verified. The temperature of the surrounding air is also confirmed by the computation including the temperature in the phantom.

Rectangle wave propagation in electromangetic field analysis using CIPand R-CIP methods

In this paper, for the fundamental examination, Constrained Interpolation Profile (CIP) and Rational function- Interpolation Profile (R-CIP) methods are applied to electromag- netic field analysis. And the dependency on Courant Friedrichs Lewy (CFL) condition while a rectangle wave propagates is examined using FDTD, CIP and R-CIP methods. As a result, the dependency on CFL condition while a rectangle wave propagates is also confirmed on FDTD, CIP and R-CIP methods.

Study of Rectangle Wave Propagation in Electromangetic Field Using FDTD, CIP and R-CIP Methods

In this paper, constrained interpolation profile (CIP) and rational function-interpolation profile (R-CIP) methods are applied to electromagnetic field analysis for the fundamental examination. And the dependency of Courant Friedrichs Lewy (CFL) condition is examined using FDTD, CIP and R-CIP method when a rectangle wave propagates. As a result, it is confirmed that the computational values by three methods agree well with that of theoretical one when CFL condition is equal to 1, however, the computational value is oscillated in FDTD method and that is diffused in CIP and R-CIP methods when CFL condition is less than 1. And the calculated results using FDTD, CIP and R-CIP methods in rectangle wave propagation is confirmed