Research On Electromagnetic Heating Model Of Microwave Heating Cavity

With the rapid development of science and technology,microwave has attracted much attention as a new type of green energy.Compared with traditional heating methods,microwave heating has the characteristics of faster heating speed,uniform heating,selective heating,and environmental protection.Today,microwave heating has been widely used in many fields.In order to make better use of the advantages of microwave heating,by optimally designing the microwave heating cavity,the electromagnetic field and temperature field distribution within the cavity can be more uniform,and the electromagnetic susceptibility characteristics of the heating material can be reduced.At present,the multimode microwave resonant cavity is the most common heating cavity,however,the material to be heated during the heating process often exhibits the characteristic of selective heating,because the effect of microwave heating is closely related to the electromagnetic characteristic parameters of the material.Therefore,this paper presents the differences in the heating effect of materials in the microwave resonant cavity,which causing electromagnetic field distribution uneven and uneven heating in the cavity.The electromagnetic heating model is used to establish the electromagnetic field sensitivity to the distribution of electric fields in the resonant cavity during the heating process of the material.Study the effect of temperature changes.In this dissertation,The finite difference time-domain method is used to solve electromagnetic field and thermal field equations.The distribution of the electric field of sodium chloride in resonant cavity is simulated.The heating rate of sodium chloride changes with the electromagnetic characteristic parameters and water content is shown on this paper.The results show that with the increase of the relative dielectric constant of the sodium chloride,the electric field distribution in the microwave heating cavity becomes more uniform,and the adsorption of electromagnetic waves on the medium is more obvious.With the increase of sodium chloride loss angle tangent and water content,the heating rate and steady-state temperature of sodium chloride in the cavity increased.Finally,it reveals the factors affecting the temperature heating rate and the steady-state temperature of the sodium chloride.At last,the proposes methods to improve the heating temperature rate and suggestions for lowering the steady-state temperature are suggested,which can provide theoretical basis and reference for industrial applications.