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

Zhou, Peiping; Yang, Xiaoqing; Huang, Kama; Jia, Guozhu

doi:10.1002/ceat.201400634

Cited by 9 publications

(3 citation statements)

References 19 publications

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“…The metallic waveguide and cavity walls are considered as perfect electric conductors, where the following boundary condition applies [25]:

E_{tangential} = 0

…”

Section: Methodsmentioning

confidence: 99%

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

Hong

et al. 2017

Materials

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Microwaves have been widely used in the treatment of materials, such as heating, drying, and sterilization. However, the heating in the commonly used microwave applicators is usually uneven. In this paper, a novel multi-material turntable structure is creatively proposed to improve the temperature uniformity in microwave ovens. Three customized turntables consisting of polyethylene (PE) and alumina, PE and aluminum, and alumina and aluminum are, respectively, utilized in a domestic microwave oven in simulation. During the heating process, the processed material is placed on a fixed Teflon bracket which covers the constantly rotating turntable. Experiments are conducted to measure the surface and point temperatures using an infrared thermal imaging camera and optical fibers. Simulated results are compared qualitatively with the measured ones, which verifies the simulated models. Compared with the turntables consisting of a single material, a 26%–47% increase in temperature uniformity from adapting the multi-material turntable can be observed for the microwave-processed materials.

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“…The metallic waveguide and cavity walls are considered as perfect electric conductors, where the following boundary condition applies [25]:

E_{tangential} = 0

…”

Section: Methodsmentioning

confidence: 99%

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

Hong

et al. 2017

Materials

Self Cite

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“…To increase the electric field density and to get an homogeneous temperature within a microwave continuous flow reactor, a particular riged waveguide optimized was developed [40]. The system consists in an axial ridged waveguide (a ridge of 4 mm i.d) with a TE 10 mode where one to several vertical PTFE tubes with different internal diameters were put trought it.…”

Section: Straight Milli Reactorsmentioning

confidence: 99%

Continuous flow-microwave reactor: Where are we?

Estel

Poux

Benamara

et al. 2017

Chemical Engineering and Processing: Process Intensification

104

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This article presents the different microwave continuous reactors existing, which are reported in literature to carry out chemical synthesis with a more efficient way. It shows how the methods and tools of chemical engineering can be useful and necessary to define, characterize and optimize the microwave reactors. This review scans continuous microwave reactors, by describing the different types of microwave technologies used (multimode, single-mode, coaxial or guided transmission. . .). It then focuses on the various existing reactor geometries and on the control of the electromagnetic field homogeneity. The problem of temperature measurement and overall instrumentation is also addressed (input power, reflected power, continuous adaptation. . .). This review scans the most efficient microwave continuous flow reactors existing in the literature and highlights how the microwave technology is used as well as chemical engineering tools. It points out the reactors geometries, the control of the electromagnetic field and the measurement of the physical parameters (Temperature, microwave power, etc.). Finally, the scale-up of continuous-flow microwave reactors is examined through the existing lab-scale and semi industrial pilot plants described in literature.

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“…Liu et al designed a ridged waveguide to heat the polymer materials, which can be melted by heating after about 25 s at 350 W [26]. Zhou et al proposed microwave-assisted continuous-flow reactors (MCFRs) based on a ridged waveguide, and the water is heated more efficiently and uniformly compared with their origin reactor [27].…”

Section: Introductionmentioning

confidence: 99%

Efficient Microwave Processing of Thin Films Based on Double-Ridged Waveguide

et al. 2023

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Microwave heating has a wide range of applications in the fields of industrial heating and drying. However, when microwave heating is applied to the thin film, it will be challenging due to its low loss and large heat dissipation area. In this paper, a double-ridged waveguide for thin-film heating is proposed. The double ridge structure is employed to enhance the electric field, thereby increasing the power-loss density in the thin film. Firstly, a double-ridged waveguide, in which the electric field strength can be about 2.5 times that of the conventional waveguide, was designed based on the transverse resonance method and the electromagnetic field simulation. Then, a multiphysics model was built to analyze the heating performance of the ridged waveguide, in which the electromagnetic field and heat transfer are coupled. The simulation results show that the heating performance of the proposed waveguide will be 35.0 times that of the conventional waveguide. An experiment was carried out to verify the proposed model, showing that the experimental results are in accordance with the simulation results. Finally, the influences of the thickness of the film, the permittivity, the distance between two ridges, and the working state on heating performance and heating uniformity were also discussed.

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

Cited by 9 publications

References 19 publications

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

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

Continuous flow-microwave reactor: Where are we?

Efficient Microwave Processing of Thin Films Based on Double-Ridged Waveguide

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