Computational study of microwave heating for rock fragmentation; model development and validation

Ahmadihosseini, Adel; Shadi, Amin; Rabiei, Moeed; Samea, Parham; Hassani, Ferri; Sasmito, Agus P.

doi:10.1016/j.ijthermalsci.2022.107746

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…The interior and exterior boundaries' heat transfer coefficients were considered equal to 20 W/m 2 K and 350-450 W/m 2 K, respectively [43]. Heat loss through radiation was not triggered and hence was neglected due to relatively low surface temperatures (see also [24]).…”

Section: Property Valuementioning

confidence: 99%

“…A complete exposition of the recent contributions to the application of numerical methods in microwave heating of rocks is undoubtedly beyond the scope of this study. Interested readers can refer to [9,[23][24][25][26] for more comprehensive accounts of these investigations. In most of these studies, the contribution of the electromagnetic field in the cavity was either neglected or accounted for by imposing constant electric and magnetic boundary conditions [27,28].…”

Section: Introductionmentioning

confidence: 99%

“…In most of these studies, the contribution of the electromagnetic field in the cavity was either neglected or accounted for by imposing constant electric and magnetic boundary conditions [27,28]. Ahmadihosseini et al [24] also reported that using the time-harmonic form of Maxwell's equation [29][30][31] could lead to unrealistic energy absorption estimates.…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

et al. 2023

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The interaction between electromagnetic waves and heat transfer phenomena due to microwave treatment is of utmost importance for an energy-efficient microwave-integrated grinding circuit. In this study, the effect of microwave irradiations on the heat absorptions of crushed particles is carried out by developing a numerical model. Crushed particles are simulated as diced-shaped geometries with different sitting arrangements but similar size distributions. The energy efficiency of the microwave treatment process is studied by introducing temperature-dependent dielectric properties and accounting for the convective heat loss from the particle boundaries to the surrounding environment. The simulations are quantitatively validated with the experimental results for heat over microwave efficiency. Heat absorption of larger particles is found to be significantly higher, and the arrangement of particles exerts a negligible effect on overall energy absorption. It is also found that ores with a larger average diameter can yield higher energy efficiencies, and the maximum absorption can be achieved by placing the particles at certain distances from the waveguide of the microwave.

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Section: Property Valuementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

et al. 2023

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“…The numerical model was the same size as the rock sample, as shown in Figure 9. The selected physical and mechanical parameters were derived from the existing literature [29,30]. The 11 contour lines were imported into MATLAB to extract the data points and then imported into COMSOL5.6 to generate an equiscale model.…”

Section: Modellingmentioning

confidence: 99%

The Law and Mechanism of the Effect of Surface Roughness on Microwave-Assisted Rock Breaking

Chen,

Li,

Zhang

et al. 2023

Applied Sciences

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In physical engineering, a rock surface, whether naturally or artificially formed, is rough. When irradiating rocks, microwaves produce reflections and diffractions on the surface of rough rocks, which significantly affect the absorption of microwave energy by rocks, thus influencing the result of microwave irradiation. In order to explore the influence of rough rock surfaces on the effect of microwave-assisted rock breaking, microwave irradiation tests were carried out on basalt samples with different values of roughness to test the temperature and P-wave velocity of the samples before and after microwave irradiation. Numerical test methods were used to systematically study the influence of rough rock surfaces on microwave irradiation. The results show that, under the same microwave irradiation conditions, the effect of microwave irradiation on rough surface basalt is more significant than that of flat surface basalt. The surface temperature distribution range of flat surface specimens is narrow, the surface temperature range of rough surface specimens is wider and more inhomogeneous, and the maximum surface temperatures of rough surface specimens are much higher than those of flat surface specimens. After irradiation, new macroscopic cracks were generated on the surface of the samples, and the crack propagation of the rough surface samples was more obvious. The decrease in P-wave velocity before and after the irradiation of flat surface samples is small, and that of rough surface samples is larger. The main factors affecting the effect of microwave irradiation on the rough surface are the refraction and reflection of electromagnetic waves, heat conduction, and stress concentration on the surface.

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“…Ahmadihosseini et al [49] , Hassani et al [50] , Teimoori et al [51] , and Shadi et al [52] analyzed the effect of microwave radiation by varying the distance between the microwave waveguide and the rock and showed that there are different optimum distances between the waveguide and different types of rocks, mainly related to the real part of the rock dielectric constant; Gao et al…”

Section: Introductionmentioning

confidence: 99%

Study on Microwave-assisted TBM Double-edged Cutter Rock-breaking Efficiency and its Positional Relationship

Wen,

Du,

Kong

et al. 2024

Eksploatacja i Niezawodność – Maintenance and Reliability

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In this study, based on a microwave test, the discrete element program (PFC) is used to establish a microwave-assisted disc cutter rock-breaking model and explore the influence law of the positional relationship between microwave radiation and disc cutter penetration on rock-breaking efficiency, and the results show that: The improvement of the positional relationship has a significant effect on improving the rock-breaking efficiency, and the double-edged cutter reaches and minimum rock-breaking specific energy when breaking the rock in the center position with a waveguide spacing of 90 mm and in the inner and outer positions with a waveguide spacing of 150 mm; When the waveguide spacing is 150mm, the double-edged cutter with cutter spacing of 110mm, 130mm, and 190mm have their advantages in rock-breaking efficiency and economic benefits, which should be selected according to the actual needs of the project. The follow-up research should also fully consider the rock type, microwave parameters, cutter profile, engineering environment, and other factors for in-depth investigation.

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Computational study of microwave heating for rock fragmentation; model development and validation

Cited by 13 publications

References 35 publications

Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

Energy Efficiency of Microwave-Induced Heating of Crushed Rocks/Ores

The Law and Mechanism of the Effect of Surface Roughness on Microwave-Assisted Rock Breaking

Study on Microwave-assisted TBM Double-edged Cutter Rock-breaking Efficiency and its Positional Relationship

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