The effect of Lewis and Damköhler numbers on the flame propagation through micro-organic dust particles

Bidabadi, Mehdi; Haghiri, Ali; Rahbari, Alireza

doi:10.1016/j.ijthermalsci.2009.10.002

Cited by 57 publications

(31 citation statements)

References 19 publications

(39 reference statements)

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“…In this study, the Lewis number is assumed to be unity [16,25]. In this article, it is assumed that a reaction occurs in a thin zone O(1/Ze), whereas preheat and postflame zones are quite large.…”

Section: Theoretical Modelmentioning

confidence: 99%

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A parametric study of lycopodium dust flame

Bidabadi

Dizaji

et al. 2015

J Eng Math

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Dust flames are associated with two-phase combustion phenomena where flame characteristics depend on interactions between solid and gas phases. Since organic dust particles can be effectively utilized in energy production systems, investigation of this phenomenon is essential. In this study, an analytical model is presented to simulate the combustion process of moist organic dust. The flame structure is divided into three zones: preheat zone, reaction zone, and postflame zone. To determine the effects of moisture content and volatile evaporation, the preheat zone is also divided into four subzones: first heating subzone and drying subzone, second heating subzone, and volatile evaporation subzone. The results obtained from the presented model are in reasonable agreement with experimental data for lycopodium particles. An increase in moisture content causes a reduction in burning velocity owing to moisture evaporation resistance. Consequently, the effects of some important parameters, like volatilization temperature, volatilization Damköhler number and drying Damköhler number are investigated. In special cases, like high moisture content, low volatilization temperature, and high drying resistance, the second heating subzone is omitted.

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Section: Theoretical Modelmentioning

confidence: 99%

“…The moisture content changes the flame structure, burning velocity, and flame temperature. Our last model [25] was developed to investigate the effect of moisture content. Also in this article, the effects of the Damköhler numbers (Da vap and Da dry ) on the combustion phenomena of organic dust particles are studied.…”

mentioning

confidence: 99%

A parametric study of lycopodium dust flame

Bidabadi

Dizaji

et al. 2015

J Eng Math

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“…In this research, it is presumed that the fuel particles vaporize to form a known gaseous compound which is then oxidized [18][19] . The kinetics of vaporization is assumed to be represented by the following expression,…”

Section: Governing Equationsmentioning

confidence: 99%

“…(4) is the combined heat capacity of the gas C p and of the particles C s , and can be evaluated from the following expression [18][19] :…”

Section: Governing Equationsmentioning

confidence: 99%

“…They explored the flame structure mechanism and the effect of temperature difference between gas and particle on the combustion characteristics of micro organic dust particles. Furthermore, in the recent study [19] , the aspects of flame propagation and the structure of combustion zone have been analytically investigated in order to clarify the mechanisms of flame propagation through organic dust cloud. In the present study, the aspects of flame propagation and the structure of combustion zone with the role of heat recirculation and non-unity Lewis number are analytically investigated in order to clarify the mechanisms of flame propagation through dust clouds.…”

Section: Introductionmentioning

confidence: 99%

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

Bidabadi

Fanaee

Rahbari

2010

Appl. Math. Mech.-Engl. Ed.

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This paper investigates the role of recirculation and non-unity Lewis number on the combustion of organic dust particles. Since recirculation effect is more noticeable in micro-combustors, it is necessary to propose a modeling approach of this phenomenon to better simulate the performance of micro-combustors. In this research, in order to model the combustion of organic dust particles, it is assumed that the dust particles vaporize first to yield a known chemical structure which is oxidized in the gas phase, and the chemical structure of this gaseous fuel is assumed methane. To study the flame structure and solve the governing equations, it is considered that the flame structure consists of three zones titled the preheat-vaporization zone, the narrow reaction zone and finally the post flame zone. The recirculation phenomenon is evaluated by entering the exhausted heat from the post flame zone into the preheat zone. The solution is based on the following approach. First, the governing equations in each zone are nondimensionalized. Then the needed boundary and matching conditions are applied in each zone. After that, these equations and the required boundary and matching conditions are simultaneously solved with the analytical model. Consequently, the remarkable effects 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 are obtained. The results show reasonable agreement with published experimental data.

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