Microwave-induced high-energy sites and targeted energy transition promising for efficient energy deployment

doi:10.1007/s11708-021-0771-y

Front. Energy

2022, Vol. 16

Issue (6) : 931-942 https://doi.org/10.1007/s11708-021-0771-y

RESEARCH ARTICLE

Microwave-induced high-energy sites and targeted energy transition promising for efficient energy deployment

Jing SUN¹, Guanqun YU¹, Kui AN¹, Wenlong WANG¹(

), Biao WANG¹, Zhenyu JIANG¹, Chenggong SUN², Yanpeng MAO¹, Xiqiang ZHAO¹, Zhanlong SONG¹

¹. National Engineering Laboratory for Reducing Emissions from Coal Combustion, Engineering Research Center of Environmental Thermal Technology (Ministry of Education), Shandong Key Laboratory of Energy Carbon Reduction and Resource Utilization, School of Energy and Power Engineering, Shandong University, Jinan 250061, China
². Faculty of Engineering, University of Nottingham, Nottingham NG7 2RD, UK

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Abstract

Diverse interactions between microwaves and irradiated media provide a solid foundation for identifying novel organization pathways for energy flow. In this study, a high-energy-site phenomenon and targeted-energy transition mechanism were identified in a particular microwave heating (MH) process. Intense discharges were observed when microwaves were imposed on irregularly sized SiC particles, producing tremendous heat that was 8-fold the amount generated in the discharge-free case. Energy efficiency was thereby greatly improved in the electricity-microwaves-effective heat transition. Meanwhile, the dispersed microwave field energy concentrated in small sites, where local temperatures could reach 2000°C– 4000°C, with the energy density reaching up to 4.0 × 10⁵ W/kg. This can be called a high-energy site phenomenon which could induce further processes or reactions enhancement by coupling effects of heat, light, and plasma. The whole process, including microwave energy concentration and intense site-energy release, shapes a targeted-energy transition mechanism that can be optimized in a controlled manner through morphology design. In particular, the discharge intensity, frequency, and high-energy sites were strengthened through the fabrication of sharp nano/microstructures, conferring twice the energy efficiency of untreated metal wires. The microwave-induced high-energy sites and targeted energy transition provide an important pathway for high-efficiency energy deployment and may lead to promising applications.

Keywords microwave discharge high-energy sites targeted-energy transition morphology design energy efficiency

Corresponding Author(s): Wenlong WANG

Online First Date: 11 October 2021 Issue Date: 17 January 2023

Cite this article:

Jing SUN,Guanqun YU,Kui AN, et al. Microwave-induced high-energy sites and targeted energy transition promising for efficient energy deployment[J]. Front. Energy, 2022, 16(6): 931-942.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-021-0771-y
https://academic.hep.com.cn/fie/EN/Y2022/V16/I6/931

Tab.1 Properties of SiC particles and dispersion media

Fig.1 Experimental setup.

Fig.2 Selected photographs of single discharge cycles for different target materials.

Fig.3 Heat generated in 1 min from SiC target materials of different particle sizes and aggregations.

Fig.4 Heating effect of SiC target materials during 1 min for the cases.

Fig.5 Temperature increases at high-energy sites in SiC targets caused by retained heat resulting from microwave discharge effects.

Fig.6 Comparison of SEM images.

Fig.7 Comparison of discharge heating effects of different treatments.

Fig.8 SEM images of copper-wire surfaces immersed in n-tetradecanoic acid.

Fig.9 Comparison of discharge light intensity of copper wires subjected to n-tetradecanoic acid treatment for different immersion times and the untreated copper wires.

Fig.10 Schematic illustration of microwave-metal discharge process.

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