Design of Large-Scale Microwave Cavity for Uniform and Efficient Plastic Heating

Jeon, Sangjun; Kim, Jae‐Kyung; Yang, Daejong

doi:10.3390/polym14030541

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…The average electric field strengths and the coefficients of variation of the electric fields in the cavities with different port distributions were further compared. The electric field coefficient of variation is used to describe the uniformity of the electric field distribution and can be expressed as [21]:…”

Section: Effects On Electromagnetic Fields Of Different Port Layoutsmentioning

confidence: 99%

Study on the Fixation of Mulberry Leaf Tea in a Multiport Microwave System

He,

Li,

Hou

et al. 2024

Processes

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Microwaves have the advantages of faster heating speed, shorter fixation time, and less pollution in tea fixation. However, there are few studies on the microwave fixation of mulberry leaf tea, which is not conducive to the promotion of mulberry leaf tea production. In order to study the fixation of mulberry leaf tea, the coaxial probe method is used to measure the dielectric constant of mulberry leaves, and the relationship connecting the real and imaginary parts of the dielectric constant and the moisture content is obtained through fitting. Based on this, a multiphysics model for mulberry leaf fixation in a six-port microwave cavity is established, which combines the characteristics of mulberry leaves, multiport heating, and mobile heating techniques. The impact of some important parameters, such as the layout and position of input ports and the thickness of mulberry leaves on the fixation process, are studied. The results show that the mutual energy coupling between ports can be reduced by using the noncoherent polarization of electromagnetic waves when the position of the ports in their working planes and the thickness of the mulberry leaves are set to (−0. 14 m, −0.15 m), (0.25 m, −0.15 m), (0.25 m, 0.15 m), (0.14 m, 0.15 m), (0.11 m, 0.0 m), (0.25 m, 0.15 m), (−0.14 m, 0.15 m), (0.11 m, 0.0 m), (0.11 m, 0.0 m), and 0.015 m when good fixation of mulberry leaves can be obtained. The study established a continuous microwave fixation experimental system for mulberry leaf tea. The experimental results indicate that the thickness of the tea affects its temperature uniformity in the microwave fixation system, which in turn affects the final quality of the tea. This study provides a reference for the industrialization of the microwave fixation of mulberry leaf tea.

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Section: Effects On Electromagnetic Fields Of Different Port Layoutsmentioning

confidence: 99%

Study on the Fixation of Mulberry Leaf Tea in a Multiport Microwave System

He,

Li,

Hou

et al. 2024

Processes

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“…Among all possible heating methods, a high-frequency electromagnetic energy source [12] characterized by fast, instantaneous, non-contact, and volumetric heating can be examined Polymers 2022, 14, 841 2 of 10 as the best choice for pultrusion applications. It is necessary to note that now it is successfully used in industrial curing processes [13][14][15][16], and microwave-assisted pultrusion processes are analyzed only experimentally [17][18][19]. A limited number of studies [20,21] published recently on the simulation aspects of microwave-assisted pultrusion processes have slowed down their development.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness and Productivity Improvement of Conventional Pultrusion Processes

2022

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Pultrusion is a technological process in which fibers impregnated with resin move through the heated die and solidify into a composite profile with a constant cross section, as in the metallic die. The effectiveness and productivity of conventional pultrusion processes, preserving the quality of pultruded profiles, could be improved by process optimization or by the application of new, effective heating sources instead of electrical resistances with high heat losses. Due to the large dimension of the numerical problem and multiple iterations applied for the solution of government equations, an optimization methodology was developed, using the method of experimental design and the response surface technique. To develop microwave-assisted pultrusion processes, as well as pultrusion tooling design and process control, new effective electromagnetic-thermo-chemical finite element models and algorithms were developed by using general-purpose finite element software that results in considerable savings in development time and costs and makes available various modeling features of the finite element packages. The effectiveness and productivity of the optimized conventional pultrusion processes and the developed microwave-assisted pultrusion processes are estimated in comparison with the real pultrusion processes used in laboratory and industrial shops.

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“…-Circular: radius150 mm /Rectangular: 260 x 260 x 200 mm -1 magnetron: 1 kW /2.45 GHz -Fixed solid sample [34] Stablished specific designs for industrial microwave cavities with more uniform and efficient plastic heating -Cylindrical: radius 215 mm and height 461 mm with Hopper -1 magnetron: 1 kW /2.45 GHz -Pellets samples [35] Developed a microwave cavity used with a hybrid drying process to dry coffee reducing heating costs and controlling temperature.…”

Section: Introductionmentioning

confidence: 99%

Multiphysics Modeling to Assist Microwave Cavity Design for Food Processing

Salvador

Teleken

Travassos

et al. 2022

IJECER

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Microwave technology has many current applications. It is very useful for food processing, including domestic cooking and warming-up and industrial heating and drying. It heats faster than conventional applications; however, in most cases result in non-uniform temperature distribution. Adequate cavity and equipment designs can reduce the impact of these heterogeneities and using multiples magnetrons is a possibility to mitigate hot and cold spots. Yet, the literature lacks methods to evaluate and compare multiple magnetrons designs. This study aimed to develop a procedure to evaluate the number and position of magnetrons connected to an application cavity using multiphysics modelling and simulation of the microwave distribution and heating of a food model. It was based on evaluating the electric field distribution into a selected working volume filled with air or a mixture of air-potato and the consequent effective power absorbed and temperature distribution into the air-potato medium. The assisted methodology with process simulation offers an insight into food temperature distribution, which would be very difficult to obtain experimentally or in any equipment design methodology. In this case study, it was found that up to 6 magnetrons are good enough when active in approximately 0.16 m3 cavity with a load that fills 10% of its volume.

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Design of Large-Scale Microwave Cavity for Uniform and Efficient Plastic Heating

Cited by 12 publications

References 39 publications

Study on the Fixation of Mulberry Leaf Tea in a Multiport Microwave System

Study on the Fixation of Mulberry Leaf Tea in a Multiport Microwave System

Effectiveness and Productivity Improvement of Conventional Pultrusion Processes

Multiphysics Modeling to Assist Microwave Cavity Design for Food Processing

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