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As an efficient and clean energy, microwaves have been widely used for industrial production. However, hot spots and thermal runaway have prevented the large-scale application of microwaves. In this paper, a new multiphysics model is proposed to solve the problem of non-uniform heating. In this model, electromagnetics and heat transfer are coupled to simulate the heating process. The sample is wrapped...
Microwave heating usually leads to non-uniform temperatures due to the existence of drastic variation of electric field. In this study, a numerical method combined with integral equation and spectrum analysis is proposed to find its generation condition. Results show that the electric field is generally unstable, and a tiny shift in microwave frequency, permittivity of dielectric object or cavity...
As an efficient and clean energy, microwaves have been very attractive for chemical engineering. Compared with the conventional heating methods, researches on chemical synthesis demonstrate microwave heating could dramatically improve reaction rates, product yields and product purities. However, non-uniform heating and thermal runaway may destroy the samples and prevent the large-scale application...
In this paper, a frequency selective absorber (FSA) with asymmetric performance is proposed. Modified log-periodic dipole array (LPDA) elements are applied to construct the FSA. With the ultra wide band (UWB) property of the LPDA-shaped elements, the FSA gets the UWB absorbing band. Due to the directionality of the LPDA, the FSA is asymmetric network which means that the reflection coefficients of...
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