Investigation over the recirculation influence on the combustion of micro organic dust particles

Bidabadi, Mehdi; Fanaee, A.; Rahbari, Alireza

doi:10.1007/s10483-010-1303-7

Cited by 13 publications

(8 citation statements)

References 18 publications

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“…The governing equations were solved in these zones using the required boundary and matching conditions, which are achieved from non-asymptotic or asymptotic approach. However, the solutions of similar problems [6] showed the applicability of non-asymptotic and asymptotic approaches for such problems. Furthermore, the results proved that by increasing the length of preheat zone, the normalized temperature was also increased while this issue was conversely occurred in the post-flame zone.…”

Section: Introductionmentioning

confidence: 99%

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Fanaee

Esfahani

2015

Meccanica

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This paper investigates the combustion phenomenon in catalytic micro-combustor by using a twodimensional model. In solution of energy and mass equations, the temperature and mass dependant reaction rates are considered with an iterative procedure where the series matching conditions are exerted between neighbor zones. The reaction zone thickness is considered as a variable parameter and predicted by the solution results of the present study. The study of main parameters effects such as normalized wall temperature, Peclet number and equivalence ratio is also attained. The limitations of low and high Peclet number are determined where at high Peclet numbers the maximum temperature is decreased and the trend is inversed at low Peclet numbers. In order to validate this model the results are compared with published experimental data, showing an acceptable agreement and confirming the accuracy of the predicted data.

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Section: Introductionmentioning

confidence: 99%

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Fanaee

Esfahani

2015

Meccanica

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“…The heat recirculation in a biphasic mixture was scrutinized by adding a linear term to the energy conservation equation. The heat recirculation can be then expressed as 25

Q_{normalR} = h (T - T_{normal∞}) \cdot Sign (X - X_{normalf}) .

…”

Section: Analytical Investigationmentioning

confidence: 99%

“…This stream can preheat the fuel input to the combustion chamber due to its high temperature gaseous content. Bidabadi et al 25 comprehensively addressed this effect by extending a model, which was considered in dust particles combustion. In their results, the remarkable impacts of recirculation and nonunity Lewis number on the combustion characteristics of the organic dust particles, such as burning velocity and temperature profiles for different particle radii, were obtained.…”

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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“…The aim of this analysis is to estimate the effect of the Lewis number, heat recirculation and random distribution of particles along the wall temperature variation on the combustion behavior and flame structure of the organic dust particles. 15…”

Section: 12mentioning

confidence: 99%

“…Until 2009, there was no research addressing the recirculation effect in dust particles. Bidabadi et al [15] analyzed this importance in a comprehensive manner. They developed a model to consider this effect in dust particles.…”

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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Investigation over the recirculation influence on the combustion of micro organic dust particles

Cited by 13 publications

References 18 publications

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

Analytical two-dimensional modeling of hydrogen–air mixture in catalytic micro-combustor

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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