Optimisation of electric field uniformity in microwave heating systems by means of multi-feeding and genetic algorithms

Tortajada, Elsa Domínguez; González, Pedro Plaza; Morcillo, Alejandro Diaz; Balbastre, J.V.

doi:10.1504/ijmpt.2007.013134

Cited by 22 publications

(1 citation statement)

References 5 publications

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“…25 Tortajada et al compared the situation of a multi-mode cavity containing a single feed port and four feed ports, the results show that electromagnetic field distribution in the microwave cavity with four feed ports is more uniform. 26 In addition, some researchers proposed to change the sample position during the heating process to improve the uniformity. Geedipalli et al added a rotating tray during the microwave heating process, the heating uniformity is improved by 37% to 43% after heating for 30 seconds.…”

Section: Introductionmentioning

confidence: 99%

Dynamic model for controlled uniform processing under microwave heating by using a heat exchanger

Teng

Shu

Hong

et al. 2021

Int J RF Microw Comput Aided Eng

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The development of microwave heating technology promotes the improvement of industry quality and efficiency, but the drawbacks of microwave heating, such as uneven heating, prevent its wide application in industry. In this paper, a double-layer ring tube is proposed for improving the heating uniformity and achieving the target temperature. The gap between the inner and outer tubes is evenly divided into four regions, and the cooling liquid flows through the gap to control the temperature of the heating target placed in the inner tube. Maxwell's equation, heat conduction equation, Navier-Stokes equation and the mass conservation equation are coupled to simulate the heating process, and the experimental data and simulation data are compared to verify the correctness of the model. Meanwhile, the heating uniformity of structure with or without heating exchanger is compared, and the effect of different fluid velocities, different sizes of the reactor and different dielectric constant of heating target on the heating performance is discussed.

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Section: Introductionmentioning

confidence: 99%

Dynamic model for controlled uniform processing under microwave heating by using a heat exchanger

Teng

Shu

Hong

et al. 2021

Int J RF Microw Comput Aided Eng

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Microwave‐Assisted Continuous‐Flow Reactor Based on a Ridged Waveguide

et al. 2015

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Microwave-assisted continuous-flow reactors (MCFRs) are a valuable alternative to conventional reactors for accelerating chemical reactions. However, despite several interesting applications, only little quantitative research has been conducted on the temperature uniformity of the heating load. With water as a common inorganic solvent, a novel MCFR type based on a special ridged waveguide for heating water is studied by optimizing some parameters of micropipes in order to achieve better temperature uniformity. Compared to the original reactor, the standard deviation of the electric field decreased significantly when using the optimized reactor under the same heating conditions while the average electric field density increased. The optimized results were verified by experiments.

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Soybean drying characteristics in microwave rotary dryer with forced convection

Wang

et al. 2009

Front. Chem. Eng. China

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A new hybrid drying technique by combining microwave and forced convection drying within a rotary drum, i.e., microwave rotary drying, was developed with the purpose to improve the uniformity of microwave drying. In a laboratory microwave rotary dryer, rewetted soybean was utilized as experimental material to study the effects of drum rotating speed, ventilation flow rate, and specific microwave power on the drying kinetics and cracking ratio of soybean. It was found that, with rotation, the cracking ratio can be lowered but without distinct improvement in the drying rate. Increasing ventilation flow rate and specific microwave power can improve the drying rate, but the cracking ratio also increases as a negative result. The cracking ratio lower than 10% can be attained for ventilation flow rate lower than 2.0 m 3 $h -1 or specific microwave energy lower than 0.4 kW$kg -1 in the present experiments.

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Optimisation of electric field uniformity in microwave heating systems by means of multi-feeding and genetic algorithms

Cited by 22 publications

References 5 publications

Dynamic model for controlled uniform processing under microwave heating by using a heat exchanger

Dynamic model for controlled uniform processing under microwave heating by using a heat exchanger

Microwave‐Assisted Continuous‐Flow Reactor Based on a Ridged Waveguide

Soybean drying characteristics in microwave rotary dryer with forced convection

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