Fundamentals and applications of microwave energy in rock and concrete processing – A review

Wei, Wei; Shao, Zhushan; Zhang, Yuanyuan; Qiao, Rujia; Jie-pu, Gao

doi:10.1016/j.applthermaleng.2019.113751

Cited by 148 publications

(26 citation statements)

References 104 publications

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“…Four different kinds of polarization phenomena can occur in materials: electronic, atomic, ion, and orientation polarization [34]. The first one occurs in neutral atoms when an electric field displaces the nucleus with respect to the electrons that surround it, resulting in a dipole moment that responds to the applied field, whereas atomic polarization results from nuclei displacement of different atoms in a molecule [35]. The orientation polarization exists only in polar materials and consists of the re-orientation of permanent dipoles caused by the electromagnetic field [36].…”

Section: Elements Of Dielectric Theorymentioning

confidence: 99%

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

et al. 2020

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Microwave heating offers a lot of advantages compared to conventional heating methods in the chemical reactions field due to its positive effects on reaction time and selectivity. Dielectric properties, and in particular permittivity, of substances and mixtures, are important for the optimization of microwave heating processes; notwithstanding this, specific databases are poor and far from being complete, and in the scientific literature very little data regarding these properties can be found. In this work, impedance measurements were carried out using a specially designed system to get the real and imaginary parts of the dielectric constant. The apparatus was tested in the estimation of permittivity of water–ethanol and water–NaCl mixtures, varying their composition to obtain a wide range of permittivity values. The results were compared to literature data and fitted with available literature models to verify the correspondence between them, finding that permittivity dependence on mixture composition can be effectively described by the models.

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Section: Elements Of Dielectric Theorymentioning

confidence: 99%

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

et al. 2020

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“…Microwave is an electromagnetic radiation with frequencies varies from 300MHz to 300GHz, which showed great potential in industrial and scientific practical applications [1][2][3][4][5]. Due to its potential for significant process benefit, the recent interest in microwave processing of materials is highlighted by many research groups all over the world.…”

Section: Introductionmentioning

confidence: 99%

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

Wei

Shao

Chen³

et al. 2021

IEEE Access

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“…In the view of micromechanics, the strain localization is caused by the accumulation and coalescence of distributed microcracks. The micromechanical phenomena were experimentally observed by acoustic emission and scanning electron microscopic techniques (Amitrano and Schmittbuhl, 2002; Menéndez et al., 1996; Oda et al., 2004; Wei et al., 2019; Wibberley et al., 2000). Furthermore, many micromechanics-based models of stress–strain relationship were proposed (Krajcinovic et al., 1991; Li and Wu, 2018; Li and Shao, 2016; Li et al., 2018a, 2018b, 2019; Yang and Misra, 2012; Zhang et al., 2019; Zhou et al., 2008), and the effects of micromechanical parameters on stress–strain curves were studied.…”

Section: Introductionmentioning

confidence: 99%

An analytical model of multi-stress drops triggered by localized microcrack damage in brittle rocks during progressive failure

et al. 2020

International Journal of Damage Mechanics

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Stress drops in stress–strain constitutive curves of intact brittle rocks under high confining pressure have great significance for evaluating the earthquake mechanism and the safety of deep underground engineering. Microcrack growth in intact rock strongly influences the stress drops. However, the theoretical model of microcrack growth-dependent multi-stress drops rarely is proposed in stress–strain curves of intact rocks. In this study, a constitutive model depending on the damage variable relating to microcrack growth and strain increment is proposed to explain the multi-stress drops in stress–strain curves including strain hardening and softening phases of intact rocks. This model is formulated by combining the wing crack growth model, the suggested relationship between axial strain and wing crack growth, and the stepping function of damage relating to axial strain. This stepping function of damage relating to axial strain approximately is used to simulate the developing process of the small individual shear bands caused by the local microcrack accumulation and coalescence. The effects of parameters in the suggested stepping function of damage on the stress–strain curves containing stress drops are discussed. The theoretical model qualitatively explains the experimental phenomena of multi-stress drops in the stress–strain curves, which provides an important implication for evaluating the earthquake mechanism and the safety of deep underground engineering.

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Fundamentals and applications of microwave energy in rock and concrete processing – A review

Cited by 148 publications

References 104 publications

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

Microwave Heating Improvement: Permittivity Characterization of Water–Ethanol and Water–NaCl Binary Mixtures

A Fully Coupled Electromagnetic Irradiation, Heat and Mass Transfer Model of Microwave Heating on Concrete

An analytical model of multi-stress drops triggered by localized microcrack damage in brittle rocks during progressive failure

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