Finite Element Analysis of Mode Stirrer Impact on Electric Field Uniformity in a Microwave Applicator

Effects of Magnetron Arrangement and Power Combination of Microwave on Drying Uniformity of Carrot

“…[1,5,16] Electromagnetic field uniformity in the cavity may be improved by proper design of magnetron arrangement and power control [20] to achieve improved drying uniformity. [1,19] Jeni et al reported that magnetron position in the different magnetron feeding systems can affect the electric field distribution in a multimode cavity. [21] Electromagnetic field uniformity of double-feeding mode was better than that of single feeding mode.…”

“…[5,16] Overheating can cause product burning, flavor deterioration, [17,18] and health hazards. [19] Thus, heating uniformity has become one of the key issues in recent research. [1,5,16] Electromagnetic field uniformity in the cavity may be improved by proper design of magnetron arrangement and power control [20] to achieve improved drying uniformity.…”

Effect of the Inside Placement of Electrically Conductive Beads on Electric Field Uniformity in a Microwave Applicator

“…To evaluate MW heating uniformity, mathematical simulation is very helpful to predict EM distribution. [17][18][19]29] The finite element method (FEM) has been successfully used to model the effect of the structure of mode stirrer on the uniformity of microwave heating [18,19] and the power distribution in the material. [30,31] By analyzing the heating uniformity attained by a rotating turntable in a microwave oven, it has been proven that a turntable can improve heating uniformity in a MW cavity by about 40%.…”

“…[10,11] The EM field distribution in the cavity depends on its geometry as well as the physical and dielectric properties of the materials subjected to the MW field. [12][13][14][15] In the literature, many methods have been proposed to improve uniformity of the electromagnetic field distribution; e.g., by changing microwave frequency, [16] using mode stirrers, [17][18][19] increasing the number of microwave feed ports suitably distributed, [20,21] using pulsed microwave heating, [22,23] using a moving microwave radiator, [24] combining microwave and infrared irradiation, [25][26][27] and fluidizing electrically conductive beads inside the microwave cavity jacket walls. [28] Li et al [10] have given an evaluative overview on various issues related to uneven microwave heating.…”

Impact of Filled Materials on the Heating Uniformity and Safety of Microwave Heating Solid Stack Materials

“…However, there are also some natural drawbacks of microwave heating: (a) When heating materials by microwave, there exist "hot spots" and thermal runaway problems in the system temperature [7], which will cause degradation of the processing materials [8][9][10][11] and even cause burning and explosion of the microwave reactor and reactants [12,13]. (b) When dealing with numerous solid materials, their stacking in the heating cavity can easily result in some sharp edges, tips or submicroscopic irregularities, which may lead to electric sparks or electric arcs [14,15].…”