Thermal radiative study of counterflow combustion of porous particles

Moghadasi, Hesam; Malekian, Navid; Poorfar, Alireza Khoeini; Bidabadi, Mehdi

doi:10.1016/j.cep.2018.10.018

Cited by 10 publications

(4 citation statements)

References 20 publications

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“…The protection can be provided by venting and suppression systems. [6][7][8][9][10][11] Considering the increased combustion efficiency and high burning rate of aluminum powder, it has attracted the attentions to be used in several applications. [12][13][14] Recently, combustion of organic and inorganic particles has been studied in some investigations.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Flame Propagation Speed in a System of Random Discrete Sources for Spherical Particles in a Three-Dimensional Space

Sadeghi

Moghadasi

Malekian

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Realistic estimation of combustion phenomenon can be achieved by considering a random distribution for the particles instead of uniform distribution. Hence, in this study, theoretical investigation of aluminum particles combustion is studied three dimensionally with the consideration of random dispersion for discrete sources. Moreover, flame propagation speed is predicted through a proposed thermal model in a reaction medium. In addition, it is inferred that the propagation speed of the flame is a function of concentration and diameter of aluminum dust; while the minimum ignition energy is a function of particle diameter and equivalence ratio. A suitable prediction of the model is concluded by comparing the obtained results with the experimental and analytical data.

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Section: Introductionmentioning

confidence: 99%

Evaluation of Flame Propagation Speed in a System of Random Discrete Sources for Spherical Particles in a Three-Dimensional Space

Sadeghi

Moghadasi

Malekian

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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“…Also, with an increase in equivalence ratio from

1.1

1.5

, the flame temperature enhances. Moghadasi et al 20 analytically examined a counterflow nonpremixed combustion of porous biomass particles considering the thermal radiation effects. Their results revealed that the rise of dust concentration from

67

to 83 g/cm 3 , decline of particles radius from

60

to 30 μm, and porosity from

0 %

6 %

would lead to a rise in the flame temperature.…”

Section: Introductionmentioning

confidence: 99%

Analysis of nonpremixed multiregion laminar flames through biofuel porous particles considering the effect of heat recirculation

et al. 2020

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In this study, a comprehensive analysis is conducted to evaluate the effects of heat recirculation and particle porosity on combustion characteristics of multizone counterflow nonpremixed flames fed with porous biofuel particles. For this purpose, the structure of flame contains preheat, postvaporization, and oxidizer zones. Additionally, Lycopodium is considered as the volatile biofuel, especially due to its appreciable flammability and dispensability. Dimensionalized and nondimensionalized forms of mass and energy conservation equations are scrutinized in each zone. To explore of the thermal recirculation effect, a specific term is included in the energy conservation equation. The variation of several parameters, including flame temperature, particle radius, mass fraction of the gaseous fuel and oxidizer, mass particle content, equivalence ratio, and particle porosity, is studied in this work considering and ignoring the thermal recirculation impact. As a result, increasing heat recirculation coefficient from k = 0 to 1 will rise the flame temperature and shift the flame position to the left side (fuel nozzle). Furthermore, consideration of the thermal heat recirculation will improve the gaseous fuel production in the preheat and postvaporization zones. Additionally, an increase in mass concentration and reduction of particles radius and porosity would lead to a rise in the flame temperature.

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“…In another study, Rockwell and Rangwala [17] scrutinized a premixed dust-air flame in existence of a homogeneous gas-phase reaction front. Moghadasi et al [18] studied combustion of organic particles in a counterflow arrangement considering porosity and thermal radiation effects.…”

Section: Introductionmentioning

confidence: 99%

Analytical Model of Recirculation Influence on Premixed Combustion of Lycopodium Dust Particle: Studying Thermal Resistance and Random Distribution of particles

2019

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In the present study, a comprehensive analytical method is developed to model the flame propagation through organic particles with air as a two-phase mixture, considering random distribution and particles thermal resistance. For this purpose, the structure of flame contains a preheat-vaporization zone, a reaction zone where vaporization and convection rates of particles are negligible and a post flame zone where diffusive terms are negligible in comparison of other terms zone. In order to enhance the combustion efficiency, the exhausted heat from the post flame zone is recirculated back to the preheat zone. Since this stream consists of high temperature gaseous mixture, it can enhance the temperature of the initial two-phase mixture entering the combustion chamber. A reasonable agreement between the results of the analytical approach and the experimental findings was obtained. Apart from the randomness distribution of particles and heat recirculation phenomena, the effect of thermal resistance on the combustion properties such as burning velocity and flame temperature is studied through non-zero Biot numbers in this model. Additionally, the variation of several parameters including equivalence ratio, particle diameter and Lewis number are studied in this research.

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Thermal radiative study of counterflow combustion of porous particles

Cited by 10 publications

References 20 publications

Evaluation of Flame Propagation Speed in a System of Random Discrete Sources for Spherical Particles in a Three-Dimensional Space

Evaluation of Flame Propagation Speed in a System of Random Discrete Sources for Spherical Particles in a Three-Dimensional Space

Analysis of nonpremixed multiregion laminar flames through biofuel porous particles considering the effect of heat recirculation

Analytical Model of Recirculation Influence on Premixed Combustion of Lycopodium Dust Particle: Studying Thermal Resistance and Random Distribution of particles

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