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

Wang, Ruifang; Huo, Huihui; Dou, Rubiao; Li, Zhanyong; Mujumdar, Arun S.

doi:10.1080/07373937.2014.929585

Cited by 9 publications

(2 citation statements)

References 37 publications

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“…problems when dealing with materials that have a low flashing point or in high temperature conditions [16,17]. For studies on microwave heating uniformity improvement, the common methods could be categorized into two aspects [18]: (1) To improve the uniformity of the electromagnetic field in the microwave cavity, such as optimization of microwave power feeding situations [19][20][21][22], introducing of mode stirrers [23,24], application of conductive matter [25,26] and optimization of heating chamber structure [27,28]; (2) to improve the uniformity of microwave energy absorption, such as introducing of a rotating turntable or conveyor belt [29,30], optimization of the shapes and sizes of processing materials [26,31,32]. For studies on the electric discharge phenomena, related research has focused on microwave discharges in sintering of powdered metals.…”

Section: Geometrymentioning

confidence: 99%

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

et al. 2018

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Microwave heating of solid stack materials is common but bothered by problems of uneven heating and electric discharge phenomena. In this paper, a method introducing fluid materials with different relative permittivity is proposed to improve the heating uniformity and safety of solid stack materials. Simulations have been computed based on the finite element method (FEM) and validated by experiments. Simulation results show that the introducing of fluid materials with proper relative permittivity does improve the heating uniformity and safety. Fluid materials with the larger real part of relative permittivity could obviously lower the maximum modulus value of the electric field for about 23 times, and will lower the coefficient of variation (COV) in general, although in small ranges that it has fluctuated. Fluid materials with the larger imaginary part of relative permittivity, in a range from 0 to 0.3, can make a more efficient heating and it could lower the maximum modulus value of the electric field by 34 to 55% on the whole studied range. However, the larger imaginary part of relative permittivity will cause worse heating uniformity as the COV rises by 246.9% in the same process. The computed results are discussed and methods to reach uniform and safe heating through introducing fluid materials with proper relative permittivity are proposed.

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Section: Geometrymentioning

confidence: 99%

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

et al. 2018

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“…Changing the distribution of the electromagnetic field inside the microwave oven is usually achieved by changing the microwave frequency, phase and position of the feed port [10][11][12][13]. For example, for causing random scattering of microwaves, conductive beads are used [14,15], and a mode stirrer is introduced to stir the distribution of the electric field in the microwave oven [5,16]. To change the position of the heated material, a turntable and conveyor belt are often used inside the microwave oven [17,18].…”

Section: Introductionmentioning

confidence: 99%

Effects of Metal Boundary Stretching and Sample Translational Motion on Microwave Heating

Wang

Yan

et al. 2022

Processes

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For the purpose of improving uniformity and efficiency of microwave heating, moving components are widely used. In this paper, a kind of stretching microwave oven with a conveyor belt is designed. The conveyor belt and the stretching motion of the upper surface of the microwave oven make the electric field in the microwave cavity continuously change during heating, so that the absorption pattern of materials does not remain constant. The transformation optics method is used to simulate the stretching motion of the upper wall of the microwave oven, and the implicit function method is used to simulate the translational motion of the sample on the conveyor belt. The correctness of the simulation model is validated by experiments. The heating effects for the cases of fixed heating, stretching and translational motion are compared. Finally, the heating effects for the proposed model with different heated materials are also discussed.

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Non-uniformity investigation in a combined thermal and microwave drying of silica gel

Song

Wang

et al. 2016

Applied Thermal Engineering

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

Cited by 9 publications

References 37 publications

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

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

Effects of Metal Boundary Stretching and Sample Translational Motion on Microwave Heating

Non-uniformity investigation in a combined thermal and microwave drying of silica gel

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