Model Stirrer Based on a Multi-Material Turntable for Microwave Processing Materials

Ye, Jinghua; Hong, Tao; Wu, Yuanyuan; Wu, Li; Liao, Yunmao; Zhu, Huacheng; Yang, Yang; Huang, Kama

doi:10.3390/ma10020095

Cited by 48 publications

(13 citation statements)

References 25 publications

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“…The waveguide filled with air works in the TE 10 mode, providing a power of 300 W and operating at 2.45 GHz. The input parameters of the geometric model are given in Table 1 [9,[16][17][18][19].…”

Section: Multiphysics Simulation Of a 3-d Modelmentioning

confidence: 99%

A Fast and Accurate Method for Computing the Microwave Heating of Moving Objects

et al. 2020

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In this paper, we show a fast and accurate numerical method for simulating the microwave heating of moving objects, which is still a challenge because of its complicated mathematical model simultaneously coupling electromagnetic field, thermal field, and temperature-dependent moving objects. By contrast with most discrete methods whose dielectric parameters of the heated samples are updated only when they move to a new position or even turn a circle, in our simulations a real-time procedure is added to renew the parameters during the whole heating process. Furthermore, to avoid the mesh-mismatch induced by remeshing the moving objects, we move the cavity instead of samples. To verify the efficiency and accuracy, we compared our method with the arbitrary Lagrangian–Eulerian method, one of the most accurate methods for computing this process until now. For the same computation model, our method helps in decreasing the computing time by about 90% with almost the same accuracy. Moreover, the influence of the rotational speed on the microwave heating is systematically investigated by using this method. The results show the widely used speed in domestic microwave ovens, 5 rpm, is indeed a good choice for improving the temperature uniformity with high energy efficiency.

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Section: Multiphysics Simulation Of a 3-d Modelmentioning

confidence: 99%

A Fast and Accurate Method for Computing the Microwave Heating of Moving Objects

et al. 2020

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“…The initial temperature of the potato block is 293.15 K. It is assumed that the temperature of air in the cavity is also 293.15 K. Since the temperature of the potato block and the frequency of the microwaves are all in a small range, the influence of temperature and frequency on the dielectric constant of the potato block is ignored. Related input parameters of simulation are shown in Table 1 [23]. In order to change the microwave frequency in the model, MATLAB programming (2015a, MathWorks Inc., Natick, MA, USA, 2015) and finite element method (COMSOL) are combined.…”

Section: Input Parametersmentioning

confidence: 99%

Sweep Frequency Heating based on Injection Locked Magnetron

et al. 2019

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Conventional microwave heating has serious problems such as non-uniform heating and low efficiency. A novel magnetron microwave sweep frequency heating method is proposed to improve microwave heating uniformity. In this method, the frequency-sweeping signal is injected into the magnetron by the injection frequency-locking technique, and the microwave sweep frequency heating of the magnetron is realized. In this paper, a complicated injection frequency locking system is given and analyzed and a multiphysics calculation model based on the finite element method for electromagnetic waves and heat transfer is established. The calculation of microwave sweep frequency heating is realized by the combination of COMSOL and MATLAB. The results show that the sweep frequency heating has an obvious superiority. An experiment is carried out to verify the simulation results. The simulation results are in agreement with the experimental data. Moreover, the effect of sweep bandwidth and sweep interval on heating uniformity is discussed.

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“…Related input parameters are shown in Table 1. The thermal and dielectric properties of the processing materials are obtained from related literature [44][45][46][47] and modified by comparisons between experimental results and simulation results. The loss tangent of water (deionized), glycerol (analytical reagent, Yangzhou Feiyang chemical industry Co., Ltd, Yangzhou, China) and silicon carbide (99% purity, Hai Ning Zhijie pottery bearing Co., Ltd, Haining, China) is compared through the references [44][45][46] and the experiments at different temperatures, and the optimized data is chosen.…”

Section: Input Parameters and Boundary Conditionsmentioning

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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Model Stirrer Based on a Multi-Material Turntable for Microwave Processing Materials

Cited by 48 publications

References 25 publications

A Fast and Accurate Method for Computing the Microwave Heating of Moving Objects

A Fast and Accurate Method for Computing the Microwave Heating of Moving Objects

Sweep Frequency Heating based on Injection Locked Magnetron

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

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