Transformation Optics for Full-Wave Calculation of Microwave Applicators With Elements in Translation

Xiao

2018

Self Cite

Our previous work shows that the use of two time‐varying anisotropic layers on the basis of transformation optics can calculate the electric field in microwave applicators of regular shapes with moving elements in translation accurately and efficiently. However, it is difficult to deal with applicators of irregular shapes, which is widely used in practical applications. In this article, we extend this work to the calculation of electric field in applicators of irregular shapes. In the proposed two‐dimensional model, the motion region is truncated by rectangular anisotropic coated layers, including four edge layers and four corner layers. In this case, the motion region is independent of applicator shapes. Therefore, the electric field can be calculated equivalently with arbitrary irregular applicator shapes. The results show good accuracy and efficiency, which indicates that the improved method has a good potential for modeling the heating process of practical microwave applicators with elements in translation.

“…Moreover, layers V and VI get the same results in Ref. . Hence, the permittivity and permeability of all the layers can be derived.…”

Section: Description Of the Proposed Algorithmmentioning

confidence: 70%

Section: Resultsmentioning

confidence: 99%

Section: Description Of the Proposed Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Improved algorithm for calculating electric field in microwave applicators of irregular shapes with elements in translation

Xiao

2018

Self Cite

Characteristics of heating process in microwave applicators with elements in periodic motion

Feng

2018

Self Cite

Moving elements have been widely used in microwave applicators to improve heating uniformity. However, elements in periodic motion can lead to temperature oscillations in the process of heating. In this case, the processed samples are difficult to reach target temperature and the control system may also become unstable. Aiming at overcoming these problems, we investigate the temperature response of the heating process in microwave applicators with elements in periodical motion in this article. By modeling periodical motion as a periodical heat source, the temperature characteristics can be obtained by solving the heat transfer equation with eigenfunction expansions. The results show that the amplitude of temperature oscillations decreases with angular velocity of the element's motion, which is verified by experiments. It means that temperature oscillations can be reduced by increasing the element's velocity, which is helpful to improve the heating performance in microwave applicators.

Abnormal absorption of subcritical water posts in microwave heating

2019

Self Cite

Subcritical water has been widely used as the solvent in microwave‐assisted extractions, but the interaction between microwaves and subcritical water has been not yet fully understood. In this article, we find that there exists abnormal absorption of subcritical water posts in microwave heating at some temperatures with low loss factors. By calculating the absorbed power of a subcritical water post under exposure plane waves, the water post can still absorb microwave energies well at some temperatures even with low loss factors. It is different from the traditional view that materials can absorb little microwave power with low loss factors. By analyzing the characteristic equation, we show that the abnormal absorption is caused by dielectric resonance. This abnormal phenomenon can also be observed in applications with microwave cavities. It indicates that even with low loss factors, materials can be possibly heated by microwaves with good efficiency.