New Advances in Microwave Technologies and Its Applications

A special issue of Technologies (ISSN 2227-7080). This special issue belongs to the section "Innovations in Materials Processing".

Deadline for manuscript submissions: closed (20 December 2022) | Viewed by 5732

Special Issue Editors


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Guest Editor
Enzo Ferrari Department of Engineering, University of Modena and Reggio Emilia, Via P. Vivarelli 10, 41125 Modena, Italy
Interests: metallurgy; thermal applications of microwaves to metals; electromagnetic modeling; composite materials and refractory materials
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Guest Editor
Microwave Technologies Consulting, Lyon, France
Interests: microwaves; scale-up; microwave plasma; microwave-assisted synthesis; microwave drying; microwave-assisted extraction; sterilization; pasteurization
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Special Issue Information

Dear Colleagues,

Microwave-assisted processes are currently undergoing investigation for applications in a number of fields where the advantages of microwave energy may lead to significant savings in energy consumption, process time, and environmental remediation. Design limitations dictated by the operation of magnetron microwave generators have to be taken into consideration when working with applicators/reactors based on such generators, especially in the context of continuous manufacturing, for which the industry is adopting rigorous and robust measures to minimize risks and avoid batch failures. As such, there is a necessity to explore new reactor concepts by emphasizing on dedicated designs that assure controllability and monitoring of the process conditions. The recent advent of high power microwave solid state generators as well as the opening of new opportunities for processing materials has the potential to address these issues especially at lab scale and implicitly, in resulting industrial applications. This Special Issue is intended to present an update on emerging fields of applications of microwave technology, as well as on consolidated applications which are now benefiting from the use of the microwave technology. The Special Issue is focused on technologies, and hence, papers addressing microwave sources and applicators, modelling of microwave processing of materials, control and improvement of heating homogeneity, optimization of energy efficiency, achievement of unique products, and scale-up of research results are particularly welcome.

Prof. Dr. Paolo Veronesi
Dr. Marilena Radoiu
Guest Editors

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Keywords

  • microwave processing
  • solid state generators
  • scale-up
  • modelling
  • heating homogeneity
  • energy efficiency
  • bioresources
  • environment
  • cosmetics
  • chemistry
  • biochemistry
  • food
  • agriculture
  • materials
  • plasma

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Published Papers (2 papers)

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Research

14 pages, 5154 KiB  
Article
Improvement in Wear Resistance of Grade 37 Titanium by Microwave Plasma Oxy-Carburizing
by Paolo Veronesi, Alessio Balestri and Elena Colombini
Technologies 2023, 11(1), 13; https://doi.org/10.3390/technologies11010013 - 12 Jan 2023
Cited by 2 | Viewed by 1710
Abstract
Grade 37 titanium is widely used in racing applications thanks to its oxidation resistance up to 650 °C, but it suffers from poor wear and fretting resistance, especially at high temperature. In this paper, different surface modification techniques, namely, carburizing, coating by PVD-ZrO [...] Read more.
Grade 37 titanium is widely used in racing applications thanks to its oxidation resistance up to 650 °C, but it suffers from poor wear and fretting resistance, especially at high temperature. In this paper, different surface modification techniques, namely, carburizing, coating by PVD-ZrO2 and a novel microwave plasma oxy-carburizing treatment, are investigated in terms of hardness, wear resistance and scratch hardness, compared to the untreated substrate. Numerical simulation allowed optimization of the design of the microwave plasma source, which operated at 2.45 GHz at atmospheric pressure. The proposed microwave plasma oxy-carburizing treatment is localized and can serve to improve the tribological properties of selected regions of the sample; compared to untreated Grade 37 titanium, the oxy-carburized layer presents a decrease in the wear rate at 450 °C against alumina of 54% and an increase in scratch hardness of more than three times. Full article
(This article belongs to the Special Issue New Advances in Microwave Technologies and Its Applications)
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23 pages, 27759 KiB  
Article
Numerical Simulation and Optimization of Microwave Heating Effect on Coal Seam Permeability Enhancement
by Ali Jebelli, Arezoo Mahabadi and Rafiq Ahmad
Technologies 2022, 10(3), 70; https://doi.org/10.3390/technologies10030070 - 6 Jun 2022
Cited by 5 | Viewed by 2439
Abstract
In coal mining operations, coalbed methane is one of the potential hazards that must be extracted to prevent an explosion of the accumulated gas and environmental pollution. One of the mechanisms is using microwave irradiation so that the thermal stress caused by microwave [...] Read more.
In coal mining operations, coalbed methane is one of the potential hazards that must be extracted to prevent an explosion of the accumulated gas and environmental pollution. One of the mechanisms is using microwave irradiation so that the thermal stress caused by microwave heating generates fractures. In this research, we investigated the most important parameters affecting the electric and thermal fields’ distribution in coal in order to identify the effective parameters that achieve the highest temperature increase rate and to reach the highest impact and efficiency of the system with the least amount of consumed energy. In this paper, using Maxwell equations, heat transfer, mass transfer and coupling them by COMSOL, we have simulated the radiation of electromagnetic field and heat in the cavity and coal, and we have also shown the temperature dispersion inside the coal. The parameters studied included the amount of coal moisture (type of coal), operating frequency, input power and heating time, location of the waveguide, the size of the waveguide and the location of the coal, and finally the parameters were re-examined in a secondary standard cavity to separate the parameters related to the size of the environment and the cavity from the independent parameters. The results of this study show that the most effective parameter on the electric and thermal fields’ distribution within coal is the size of the resonance chamber. Additionally, the results show that the moisture of 5%, the highest input power and cutoff frequency close to the operating frequency cause the highest average temperature inside the coal, but many parameters such as operating frequency, waveguide location and coal location should be selected depending on the chamber size. Full article
(This article belongs to the Special Issue New Advances in Microwave Technologies and Its Applications)
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