A New Multicomponent Diffusion Formulation for the Finite-Volume Method: Application to Convective Droplet Combustion

Pope, Daniel N.; Gogos, George

doi:10.1080/10407790590959807

Cited by 19 publications

(18 citation statements)

References 33 publications

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“…The implications to the overall droplet vaporization behavior are also discussed. Pope and Gogos [27] have developed a new multicomponent diffusion formulation for the finite-volume method and have applied the same to convective droplet combustion. Recently, Zhang and Gogos [28] carried out numerical research on a vaporizing droplet in a forced convective environment.…”

Section: Introductionmentioning

confidence: 99%

Subcritical and supercritical droplet evaporation within a zero-gravity environment: Low Weber number relative motion

Zhang

Raghavan

Gogos

2008

International Communications in Heat and Mass Transfer

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A validated comprehensive axisymmetric numerical model, which includes the high pressure transient effects, variable thermo-physical properties and inert species solubility in the liquid phase, has been employed to study the evaporation of moving n-heptane droplets within a zero-gravity nitrogen environment, for a wide range of ambient pressures and initial freestream velocities. At the high ambient temperature considered (1000 K), the evaporation constant increases with the ambient pressure. At low ambient pressure, the evaporation constant becomes almost a constant during the end of the lifetime. At high ambient pressures, the transient behavior is present throughout the droplet lifetime. The final penetration distance of a moving droplet decreases exponentially with increasing ambient pressure. The average evaporation constant increases with ambient pressure. The variation is almost linear for reduced ambient pressures smaller than approximately 2. For higher values, depending on the initial freestream velocity, the average evaporation constant either becomes a constant (at low initial freestream velocities) or it non-linearly increases (at high initial freestream velocities) with the ambient pressure. Droplet lifetime decreases with increasing ambient pressure and/or increasing initial freestream velocity.

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Section: Introductionmentioning

confidence: 99%

Subcritical and supercritical droplet evaporation within a zero-gravity environment: Low Weber number relative motion

Zhang

Raghavan

Gogos

2008

International Communications in Heat and Mass Transfer

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“…Indeed, engineering power generation combustion systems operate at elevated ambient pressure and temperature conditions coupled with forced convective (laminar or/and turbulent) flow. The effect of forced flow/convection on hydrocarbon droplet combustion has been studied quite extensively under laminar flow conditions and therefore there is a wealth of knowledge (see, e.g., recent references [1][2][3][4][5][6][7][8][9][10], and references cited therein, M. Birouk ( ) · S. L. Toth Department of Mechanical Engineering, University of Manitoba, Winnipeg, MB R3T 5V6, Canada e-mail: madjid.birouk@umanitoba.ca to cite only a few). However, studies reporting on the effect of a turbulent or an acoustic field are quite limited (e.g., [11][12][13][14][15][16][17]).…”

Section: Introductionmentioning

confidence: 99%

Hydrocarbon Droplet Turbulent Combustion in an Elevated Pressure Environment

Birouk

Toth

2015

Flow Turbulence Combust

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New experimental data on the effect of turbulence on the combustion of nheptane and n-decane droplet at elevated pressure are reported. Turbulent flow field in the central volume of a spherical vessel was generated by a set of eight axial fans. Flow characterization demonstrated that turbulence is isotropic and homogeneous within the 40 mm central volume of the vessel. The combustion of n-heptane and n-decane droplet was examined by varying turbulence intensity via the fans rotational speed and ambient pressure and temperature inside the vessel/chamber. Results showed that droplet burning rate becomes sensitive to turbulence only at elevated ambient pressure. Droplet flame extinction was found to depend on the heat loss from the droplet envelop flame, which increases with turbulence intensity.

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“…The subscripts f, s, and i, represent fuel, particle surface, and any other species, respectively. The diffusion velocities, which depend upon the concentration and temperature gradients for all N species, are solved according to the method presented by Pope and Gogos [26]. Conservation of energy at the interface, which represents a balance between the heat conducted from ambient to the droplet surface and the heat required for phase change, is given by…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Modeling of Steady Burning Characteristics of Spherical Ethanol Particles in a Spray Environment

Sahu

Raghavan

Pope

et al. 2011

Journal of Heat Transfer

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A numerical study of steady burning of spherical ethanol particles in a spray environment is presented. A spray environment is modeled as a high temperature oxidizer stream where the major products of combustion such as carbon dioxide and water vapor will be present along with reduced amounts of oxygen and nitrogen. The numerical model, which employs variable thermophysical properties, a global single-step reaction mechanism, and an optically thin radiation model, has been first validated against published experimental results for quasi-steady combustion of spherical ethanol particles. The validated model has been employed to predict the burning behavior of the ethanol particle in high temperature modified oxidizer environment. Results show that based on the amount of oxygen present in the oxidizer the burning rate constant is affected. The ambient temperature affects the burning rate constant only after a sufficient decrease in the oxygen content occurs. In pure air stream, ambient temperature variation does not affect the evaporation constant. Results in terms of burning rates, maximum temperature around the particle, and the evaporation rate constants are presented for all the cases. The variation of normalized Damköhler number is also presented to show the cases where combustion or pure evaporation would occur.

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A New Multicomponent Diffusion Formulation for the Finite-Volume Method: Application to Convective Droplet Combustion

Cited by 19 publications

References 33 publications

Subcritical and supercritical droplet evaporation within a zero-gravity environment: Low Weber number relative motion

Subcritical and supercritical droplet evaporation within a zero-gravity environment: Low Weber number relative motion

Hydrocarbon Droplet Turbulent Combustion in an Elevated Pressure Environment

Numerical Modeling of Steady Burning Characteristics of Spherical Ethanol Particles in a Spray Environment

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