Liquid fuel combustion within silicon-carbide coated carbon foam

Vijaykant, S.; Agrawal, Ajay K.

doi:10.1016/j.expthermflusci.2007.02.006

Cited by 47 publications

(14 citation statements)

References 14 publications

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“…Considerable research effort has also been expended in devising stacked-up porous media to obtain flame stability for both liquid and gaseous fuels. Kerosene fuel combustion using silicone-carbide-coated carbon-carbon (C-C) foam was comprehensively tested by Periasamy et al [11], Vijaykant and Agrawal [12], and Periasamy and Gollahalli [13]. Jugjai and Polmart [14] made use of alumina spheres for kerosene fuel evaporation enhancement in two-section porous burner.…”

Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of Butane Porous Burner for Thermoelectric Power Generation

Mustafa

Abdullah

et al. 2015

Journal of Combustion

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The present study explores the utilization of a porous burner for thermoelectric power generation. The porous burner was tested with butane gas using two sets of configurations: single layer porcelain and a stacked-up double layer alumina and porcelain. Six PbSnTe thermoelectric (TE) modules with a total area of 54 cm2were attached to the wall of the burner. Fins were also added to the cold side of the TE modules. Fuel-air equivalence ratio was varied between the blowoff and flashback limit and the corresponding temperature, current-voltage, and emissions were recorded. The stacked-up double layer negatively affected the combustion efficiency at an equivalence ratio of 0.20 to 0.42, but single layer porcelain shows diminishing trend in the equivalence ratio of 0.60 to 0.90. The surface temperature of a stacked-up porous media is considerably higher than the single layer. Carbon monoxide emission is independent for both porous media configurations, but moderate reduction was recorded for single layer porcelain at lean fuel-air equivalence ratio. Nitrogen oxides is insensitive in the lean fuel-air equivalence ratio for both configurations, even though slight reduction was observed in the rich region for single layer porcelain. Power output was found to be highly dependent on the temperature gradient.

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Section: Introductionmentioning

confidence: 99%

Combustion Characteristics of Butane Porous Burner for Thermoelectric Power Generation

Mustafa

Abdullah

et al. 2015

Journal of Combustion

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“…Coating of carbon foams with reinforcing material can potentially eliminate cracking and achieve high structural strength in PMBs. Studies using coated carbon foams have successfully achieved combustion without incurring material degradation [12,29].…”

Section: Durability Testingmentioning

confidence: 99%

“…The energy released during chemical reactions is coupled with the conjugate heat transfer inside the porous structure, which results from strong heat exchange in the reaction zone. Although a detailed understanding of the underlying processes at the pore-scale is largely incomplete at the current state [7], both experimental and numerical studies have demonstrated advantages in flame stability, pollutant emissions, and lean flammability in PMBs both at atmospheric conditions and elevated pressures [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Lean Combustion Stability, Pressure Drop, and Material Durability in Porous Media Burners

Sobhani

Haley²,

Bartz³

et al. 2017

Volume 5C: Heat Transfer

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The operational stability and thermal durability of combustion in two-zone porous media burners (PMBs) is examined experimentally and computationally. Long-term material durability tests at constant and cycled on-off conditions are performed, along with a characterization of combustion stability, pressure drop and pollutant emissions for a range of equivalence ratios, mass flow rates, and burner setups. Experimental thermocouple temperature measurements and pressure drop data are presented and compared to results obtained from one-dimensional volume-averaged simulations. Experimental and model results show good agreement for temperature profiles and pressure drop evaluated using the Darcy-Forchheimer equation with Ergun's relations. Enhanced flame stability is observed for burners with Yttria-stabilized Zirconia Alumina (YZA) upstream and Silicon Carbide (SiC) in the downstream combustion zone. Measurements of product gas concentrations illustrate highest emissions of CO at conditions close to flash-back and, as expected, higher NO x emissions with increasing equivalence ratios.

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“…The idea of using porous media in the flame zone of a premixed flame to obtain internal heat recirculation was introduced by Takeno et al [27]. These early attempts are followed by more experimental works [5,13,16,17,28,29].…”

Section: Introductionmentioning

confidence: 98%

Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

et al. 2012

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In this paper, we perform a numerical analysis of a two-dimensional axisymmetric problem arising in premixed combustion in a porous burner with integrated heat exchanger. The physical domain consists of two zones, porous and heat exchanger zones. Two dimensional Navier-Stokes equations, gas and solid energy equations, and chemical species transport equations are solved and heat release is described by a multistep kinetics mechanism. The solid matrix is modeled as a gray medium, and the finite volume method is used to solve the radiative transfer equation to calculate the local radiation source/sink in the solid phase energy equation. Special attention is given to model heat transfer between the hot gas and the heat exchanger tube. Thus, the corresponding terms are added to the energy equations of the flow and the solid matrix. Gas and solid temperature profiles and species mole fractions on the burner centerline, predicted 2D temperature fields, species concentrations and streamlines are presented. Calculated results for temperature profiles are compared to experimental data. It is shown that there is good agreement between the numerical solutions and the experimental data and it is concluded that the developed numerical program is an excellent tool to investigate combustion in porous burner. List of symbols c pSpecific heat of the fluid (J kgof reactions N s Number of chemical species N T Number of particles per unit volume (m -3 ) Nu Nusselt number (-) p Pressure (N m -2 ) Pr Prandtl number (-) q Radiant heat flux (W m -2 ) R Universal gas constant (J kg -1 K -1 ) R i Rate of reaction i R contact Thermal contact resistance (m 2 K W -1 ) R t Total thermal resistance (m 2 K W -1 ) Re Reynolds number, /qVd p l -1 r Radial coordinate (m) r i Inside tube diameter (m) r o Outside tube diameter (m) s Radiative geometry path length (m) s Unit vector (-) T Temperature (K) u Axial velocity (m s -1 ) V Velocity vector (m/s) v Radial velocity (m s -1 ) W Molecular weight (kg kmole -1 )

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Liquid fuel combustion within silicon-carbide coated carbon foam

Cited by 47 publications

References 14 publications

Combustion Characteristics of Butane Porous Burner for Thermoelectric Power Generation

Combustion Characteristics of Butane Porous Burner for Thermoelectric Power Generation

Investigation of Lean Combustion Stability, Pressure Drop, and Material Durability in Porous Media Burners

Numerical investigation of premixed combustion in a porous burner with integrated heat exchanger

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