A rotary radiation structure for microwave heating uniformity improvement

Zhu, Huacheng; He, Jianbo; Hong, Tao; Yang, Qianzhen; Wu, Ying; Yang, Yang; Huang, Kama

doi:10.1016/j.applthermaleng.2018.05.122

Cited by 86 publications

(31 citation statements)

References 38 publications

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“…where T a is the average temperature, T i the point temperature, T 0 the initial average temperature, and n the total number of the point of the selected region, respectively. 5 According to Equation (16), a lower COV, which indicated that the model has a better uniformity of the heating results. microwave oven with heating time for 8 seconds.…”

Section: Uniformity Analysismentioning

confidence: 98%

“…4 Non-uniform heating can generate overheating problems and hotspots, which may cause quality degradation of the heated samples and even cause burning or explosion. 5,6 Hence, many new methods have been proposed to improve the heating uniformity of microwave by experts.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, two types of approaches have been used to improve the temperature uniformity of material placed in the microwave ovens including 8 : improving the uniformity of the electromagnetic field distribution in the microwave chamber, and changing the microwave energy absorption by adjusting the position of heating sample. 5,8 In the previous years, there have been many studies on improving the uniformity of microwave heating with moving elements, such as adding mode stirrers and rotating turntables to the component. 9,10 Plaza-Gonzalez et al proposed many kinds of mode stirrer components to change the distribution and the mode of the electromagnetic field in microwave heating cavities.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Accordion microwave oven for uniformity and efficiency heating

Yan

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

Self Cite

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Conventional microwave oven heating has the problem of poor heating uniformity and low heating efficiency. A novel microwave oven heating model has been proposed for improving heating uniformity by making the electric field in the microwave oven drastically change by changing the geometry of the microwave oven during the heating process. The transformation optics method is used to solve the computational difficulties caused by the continuous change of the mesh during the motion. Finally, the experiment verified the correctness of the simulation. In addition, important factors affecting heating efficiency were discussed. K E Y W O R D Saccordion microwave oven,

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Section: Uniformity Analysismentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Accordion microwave oven for uniformity and efficiency heating

Yan

Yang

et al. 2020

Int J RF Microw Comput Aided Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…Non-uniform temperature distribution is the source of many problems [13,16], such as the creation of hot spots and cold spots [17], which can seriously affect the quality of the food [9,17]. Around the location of hot spots, the temperature may be too high and can damage the nutrient substance or can cause burns or quality degradation of the final products [18]. Meanwhile, around the cold spots as well as undercooked areas, the low temperature may fail to reach the necessary level to eliminate microorganisms, which raises the risk of food deterioration and foodborne illnesses [13,18].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Heat and Moisture Transport in Bananas during Microwave Heating Process

Thuto¹,

Banjong²

2019

Processes

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The numerical method was used to investigate heat and moisture transport during dehydration of bananas from microwave heating. COMSOL multi-physics software was employed to perform the simulation task. A banana is defined as a porous medium. It has constituents of water, vapor, air as the liquid phase and a solid porous matrix. The numerical results of this study were validated with experimental data. The profiles of moisture, vapor and pressure are discussed in this study. Moreover, the effects of the ripening stages of the banana are examined. A higher heat flux was observed from the beginning period along with the increasing time steps until 50 s. Heat generation decreased during 50 s to 60 s, coinciding with a small rise in temperature, but the temperature gradient remained constant. The temperature distribution of both unripe and ripe banana samples was non-uniform. At the center of the banana, the temperature increased rapidly and reached its highest temperature with the negative temperature gradient toward the boundary surface. More heat generation was observed around the center region of the banana. This was due to higher moisture in comparison with the boundary surface. Heat and moisture were transported from the center of the banana to its surface. The water convective flux peaked around 11 mm from the center. The vapor pressure peaked at the center for all cases. Less heat generation within unripe bananas was observed due to the lower moisture content.

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“…In this paper, the heating and edge-sealing of glass were performed using microwave radiation. Due to its unique heating principles, microwave heating is characterized by efficient and internal heating which is environmentally friendly [8]. Multiple sources were applied to improve the heating-temperature distribution uniformity of the glass.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Flat-Glass Heating and Edge-Sealing Using Multiple Microwave Sources

Kim

Jeon

2019

Energies

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There has been a recent surge of interest in vacuum insulating glass (VIG) due to its excellent thermal insulation performance. Vacuum glazing is necessary for high-performance sealing solders and various applications in sealing technology. This paper describes experimental studies into heating and edge-sealing of flat glass using microwaves. Electric–thermal coupled analysis using ANSYS was employed and heating and edge-sealing experiments were conducted on flat glass. In order to ensure a uniform electric field distribution in the microwave chamber, the electric field and temperature distributions were analyzed according to waveguide patterns. In addition, the electric field and temperature distribution were analyzed with the inclusion of carbon susceptor plates. Based on the electric simulation results by waveguide pattern, a microwave heating chamber was fabricated, and a basic experiment was conducted on both heating and edge-sealing of the glass. The cross-section of the sealed glass confirmed that it was sealed without cracks or breakage.

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A rotary radiation structure for microwave heating uniformity improvement

Cited by 86 publications

References 38 publications

Accordion microwave oven for uniformity and efficiency heating

Accordion microwave oven for uniformity and efficiency heating

Investigation of Heat and Moisture Transport in Bananas during Microwave Heating Process

Experimental Study on Flat-Glass Heating and Edge-Sealing Using Multiple Microwave Sources

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