Negative erosion effect and the emergence of unstable combustion. 1. Analysis of the models

Сабденов, К. О.; Erzada, M.

doi:10.1134/s0010508216010093

Cited by 3 publications

(5 citation statements)

References 4 publications

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Section: Lco2-ptf System and Technologymentioning

confidence: 99%

“…However, compression is one of the most critical properties for gas. The density will change with gas flow, and this causes the pressure to change based on Avogadro's hypothesis as follows (Sabdenov and Erzada, 2016;Singh et al, 2011) PM ¼ qRT (11) Figure 5. Data comparison between experimental pressure and theory value.…”

Section: Ground Blasting Testmentioning

confidence: 99%

“…However, compression is one of the most critical properties for gas. The density will change with gas flow, and this causes the pressure to change based on Avogadro's hypothesis as follows (Sabdenov and Erzada, 2016;Singh et al, 2011) PM ¼ qRT (11) where P is the pressure of the gas, Pa; M is the molar mass of CO 2 , 44 g/mol; q is density, kg/m 3 ; R is the gas constant, 8.314 J Á (K Á mol) À1 ; and T is the temperature, K. According to Avogadro's hypothesis, the releasing CO 2 can be simplified as a structural model with three areas as shown in Figure 7.Here x 1 is the core area, and the pressure remains unchanged; x 2 is the transition area, and the section begins to diverge; and x 3 is the area of complete divergence. Technically, all areas can be measured in the experiment, but the transition area is not easy to locate because of its proximity to the core.…”

Section: 26%mentioning

confidence: 99%

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Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

Yingchun

Qin

Zhou

et al. 2020

Adsorption Science & Technology

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Liquid CO2 phase transition fracturing (LCO2-PTF) is an effective and economical technology used to improve the permeability of rock and coal. In this study, the working mechanisms of LCO2-PTF were analysed and relevant equipment was designed to develop and promote the application of this technology. It utilized phase transition equipment (PTE) consisting of a liquid gas container, control unit for the current and gas volume, heating tube, and other components. LCO2 blasting experiments were conducted in an airtight container to investigate the released energy, pressure, and other technical parameters. The application of LCO2-PTF for enhancing gas drainage in coal mines was then evaluated. The results of a blasting experiment showed a maximum energy of 947.12 kJ and revealed that the releasing pressure could be easily changed by varying the plate and heat tube. The releasing pressure remained unchanged within an initial distance and then decreased exponentially. The blasting products were gaseous CO2 and water vapor, with no sparks or flames. The surface temperature of the PTE ranged from 269.32 to 277.96 K. Application of LCO2-PTF in coal mines with low permeability showed gas drainage 3.38 times higher than that achieved with conventional technologies, with methane concentration increasing from 55 to 89%. The attenuation coefficient of gas emissions dropped by 94% and the gas permeability coefficient of the coal body increased more than 23 times after fracturing. The shockwave of the high-pressure gas promoted the development and extension of cracks. The influence radius of the pre-cracking coal seam was 8.1 m, which is 6.75 times that of the original coal seam. The experimental results and the engineering applications indicate that LCO2-PTF is a safe and effective technology to enhance gas drainage in coal mines.

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Section: Lco2-ptf System and Technologymentioning

confidence: 99%

“…However, compression is one of the most critical properties for gas. The density will change with gas flow, and this causes the pressure to change based on Avogadro's hypothesis as follows (Sabdenov and Erzada, 2016;Singh et al, 2011) PM ¼ qRT (11) Figure 5. Data comparison between experimental pressure and theory value.…”

Section: Ground Blasting Testmentioning

confidence: 99%

“…However, compression is one of the most critical properties for gas. The density will change with gas flow, and this causes the pressure to change based on Avogadro's hypothesis as follows (Sabdenov and Erzada, 2016;Singh et al, 2011) PM ¼ qRT (11) where P is the pressure of the gas, Pa; M is the molar mass of CO 2 , 44 g/mol; q is density, kg/m 3 ; R is the gas constant, 8.314 J Á (K Á mol) À1 ; and T is the temperature, K. According to Avogadro's hypothesis, the releasing CO 2 can be simplified as a structural model with three areas as shown in Figure 7.Here x 1 is the core area, and the pressure remains unchanged; x 2 is the transition area, and the section begins to diverge; and x 3 is the area of complete divergence. Technically, all areas can be measured in the experiment, but the transition area is not easy to locate because of its proximity to the core.…”

Section: 26%mentioning

confidence: 99%

See 1 more Smart Citation

Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

Yingchun

Qin

Zhou

et al. 2020

Adsorption Science & Technology

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“…This effect is that under certain conditions, the burning rate decreases when the burning surface of fuel is blown in a parallel flow. Various attempts to describe and explain the Vilyunov -Dvoryashin effect in more detail [26][27][28] led to the need of studying the problem of hydrodynamic stability in the zone of solid fuel gasification [24].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…i. e. in the case of a very thin film, which is the most important from the viewpoint of erosive effect [22][23][24][25][26][27][28], the conclusion about the absolute instability of the combustion process remains valid.…”

Section: Analysis Of the Characteristic Equationmentioning

confidence: 99%

A theoretical study of stability of solid fuel burning with a twophase gasification area

Волков

Makoyed

Loboda

et al. 2020

EEJET

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Theoretically, the combustion stability of solid fuel, which during the combustion process is decomposed according to the "solid phase-liquid phase-gas" scheme, is investigated. The physical and mathematical models for the propagation of small perturbations of combustion are constructed. The medium in all areas of combustion and in combustion products is assumed to be incompressible, and the viscosity of the fuel in the liquid phase is taken into account. Thus, perturbations of hydrodynamic parameters are considered not only in the two-phase gasification zone, but also in the combustion products area and the geometric perturbation of the instantaneous combustion front (flame), distorting the shape of its surface, is also specified. That is the characteristic feature of the presented physical model. The mathematical eigenvalue problem is set and solved. This problem is reduced to an algebraic characteristic equation for a dimensionless complex eigenvalue, which positivity determines the instability. It is proved that in the limiting case of the absence of a liquid phase, absolute instability takes place. At the other limiting case-for perturbations with infinite wavelength-a transition to stability takes place. The latter fact indicates that the presence of a viscous liquid film and changes in the length of the gasification zone under the influence of perturbations have a significant stabilizing effect on solid fuel combustion. In the general case, a sufficient condition for the instability of the roots of the characteristic equation is analytically determined. The physical interpretation of the mathematical results explains the processes of autoturbulization of solid fuel combustion and the possible transition of combustion to deflagration explosion or detonation. The results of the study are in qualitative agreement with experimental data and can additionally be used for theoretical analysis of the stability of the liquid fuel combustion process in the combustion chamber

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Anomalous Effect of Turbulence on the Combustion Rate of a High-Energy Solid Material

Сабденов

Erzada

2018

Russ. J. Phys. Chem. B

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Negative erosion effect and the emergence of unstable combustion. 1. Analysis of the models

Cited by 3 publications

References 4 publications

Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

A theoretical study of stability of solid fuel burning with a twophase gasification area

Anomalous Effect of Turbulence on the Combustion Rate of a High-Energy Solid Material

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Negative erosion effect and the emergence of unstable combustion. 1. Analysis of the models

Cited by 3 publications

References 4 publications

Liquid CO2 phase transition fracturing technology and its application in enhancing gas drainage of coal mines

Liquid CO2 phase transition fracturing technology and its application in enhancing gas drainage of coal mines

A theoretical study of stability of solid fuel burning with a two­phase gasification area

Anomalous Effect of Turbulence on the Combustion Rate of a High-Energy Solid Material

Contact Info

Product

Resources

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Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

Liquid CO₂ phase transition fracturing technology and its application in enhancing gas drainage of coal mines

A theoretical study of stability of solid fuel burning with a twophase gasification area