A comparison of experimental results of soot production in laminar premixed flames

Caetano, Nattan Roberto; Soares, Diego; Nunes, Roger Pizzato; Pereira, Fernando M.; Schneider, Paulo Smith; Vielmo, Horácio A.; Laan, Flávio Tadeu van der

doi:10.1515/eng-2015-0016

Cited by 18 publications

(12 citation statements)

References 13 publications

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“…However, the variation of maximum values in these fields was negligible when TI was changed. The same displacement was observed for the soot field as the turbulator was intensified, but soot amount was increased (peak soot volume fraction increased from 0.17 ppm to 0.33 ppm when comparing the weakest and the strongest turbulator, which is in the range of soot production presented in [33]). Table 1(a) presents the results obtained for the convective and radiative heat transfer rates on the cylindrical wall of the combustion chamber.…”

Section: The Impact Of Turbulators On the Combustor Thermal Behaviorsupporting

confidence: 65%

Numerical assessment of the effect of inflow turbulators on the thermal behavior of a combustion chamber

Barcelos

Centeno

2021

THERM SCI

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This work numerically investigates the effects of turbulators at the air and fuel (methane) inlets on the thermal behavior of a combustion chamber. Conservation equations for mass, momentum, energy, gaseous chemical species, soot, and temperature fluctuation variance in cylindrical axysimmetric coordinates were solved using the finite volume method. Chemical reaction rates were computed through the Arrhenius-Magnussen model, with two-step combustion reaction. The turbulence closure model, to compute the turbulent viscosity, was the standard κ-ε. The modeling of turbulence-radiation interactions (TRI) considered the absorption coefficient-temperature correlation and the temperature self-correlation. The radiative heat source was calculated using the discrete ordinates method, considering the weighted-sum-of-gray-gases (WSGG) model with the superposition method to compute the radiation from the gaseous species and soot. The effect of inlet turbulators was studied by varying the turbulence intensity of both inlet streams (air and fuel), encompassing mild to severe turbulators (TI = 3%, 6%, 15%, 20%). The results showed that temperature and radiative heat source fields, and heat transfer rates on the chamber wall and radiative fraction were importantly affected by the different turbulators intensities (e.g. radiative fraction was increased from 20.6% to 32.8% when the turbulence intensity was varied from 3% to 20%). Comparisons of results obtained when TRI modeling was neglected in relation to results obtained when TRI modeling was computed showed that TRI influenced the thermal field (temperature and radiative exchange) in a similar way independently of the turbulator intensity (e.g. radiative fraction decreased 20% when TRI modeling was neglected, for both turbulators intensities).

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Section: The Impact Of Turbulators On the Combustor Thermal Behaviorsupporting

confidence: 65%

Numerical assessment of the effect of inflow turbulators on the thermal behavior of a combustion chamber

Barcelos

Centeno

2021

THERM SCI

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“…The bench consists of air and fuel supply systems, thermal radiation measurement system, data acquisition system, and the porous media burner. The radiation source is positioned in the center, the device facilitates the precise positioning of the radiometer at different reading angles, ranging from 0 to 180°, as well as in different radial positions, ranging from 50 to 500 mm [8].…”

Section: Methodsmentioning

confidence: 99%

“…According to data from the International Energy Agency, the world demand for energy grows by 56% by 2040 [5][6][7]. Carbon emissions, associated with energy generation and consumption worldwide, are expected to increase by 46% over the next 30 years [8][9][10][11]. In this scenario, there is a growing need for processes that improve efficiency and reduce the emission of air pollutants [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Experimental Assessment of Thermal Radiation Behavior Emitted by Solid Porous Material

Caetano¹,

Lorenzini²,

Lhamby³

et al. 2020

IJHT

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Porous media burners have been the focus of many studies due to the advantage in different applications in industry, which exhibit a directional emission of thermal radiation and low emission of pollutants. Indeed, these characteristics yields benefits regarding productivity by an environment friendly process. Thus, this work analyzes the behavior of radiation heat flux emitted by materials of different linear densities and porosities, varying the rate of air/fuel mixture and the flame power. In this way, was constructed an experimental setup that consists in a supply system of air/fuel, data acquisition, burner support for the radiation sensor, and the radiometer. This structure enables the displacement from 0°C to 90°C allowing the analysis of radiation in the area of a semisphere. The results shown that the silicon carbide has higher radiation efficiency than zirconia, due the higher thermal conductivity and emissivity. However, the silicon carbide degraded in one of the measurements. The ZrO2 media has proved challenging to stabilize for equivalence ratios below 0.6. Regarding the porosity, it is concluded that the higher the porosity, the greater the radiation efficiency, the expected result because there is a larger contact area for the reaction to occur within the pores.

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“…The synthesized zeolites can be used for the adsorption of carbon dioxide (CO 2 ) to mitigate the environmental impacts caused by greenhouse gas emissions [20][21][22][23][24]. The wide application of zeolites for CO 2 adsorption is enabled due to larger pore cavities compared to the molecular diameter of carbon dioxide [25][26][27][28][29]. The aim of the present work is to compare and diagnose the additions of an external source of aluminium (ESA) for synthesis of zeolite from RHA.…”

Section: Introductionmentioning

confidence: 99%

Comparative study using different external sources of aluminum on the zeolites synthesis from rice husk ash

Klunk

Das

Dasgupta

et al. 2020

Mater. Res. Express

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Rice husk is considered as a waste in the rice industry but is proficient in manufacturing different materials, such as zeolites, which is produced in large quantities all over the world, for example in Brazil. Zeolite is an adsorbent support material, which can be synthesized from rice husk ash (RHA) with external sources of aluminium (ESA). The scientific community has been conducting several measures to minimize the environmental impacts caused by greenhouse gases. Several mitigation processes are presently investigated, which includes carbon dioxide injections into adsorbent materials (e.g. zeolites). The efficiency of this technology involves a zeolitic material with high crystallinity and high concentrations of SiO 2 and Al 2 O 3 (aluminosilicates). In the present work, zeolites have been synthesized from rice husk ash (SiO 2 source) and external aluminium sources (Al 2 O 3 -alumina, gibbsite and metakaolin) to fulfill that purpose. With the aid of XRF, XRD, SEM/ EDS and FTIR techniques, the zeolitic material was characterized in two distinct crystalline phases: Mordenite and ZSM-5. The synthesis was carried out by the ideal addition of ESA (2.5 g) to RHA. According to the literature, the zeolitic materials formed by the mixture of Mordenite and ZSM-5 can be availed for gas separation and greenhouse gas storage.

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A comparison of experimental results of soot production in laminar premixed flames

Cited by 18 publications

References 13 publications

Numerical assessment of the effect of inflow turbulators on the thermal behavior of a combustion chamber

Numerical assessment of the effect of inflow turbulators on the thermal behavior of a combustion chamber

Experimental Assessment of Thermal Radiation Behavior Emitted by Solid Porous Material

Comparative study using different external sources of aluminum on the zeolites synthesis from rice husk ash

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