Evaluation of radiative entropy generation in a high temperature system including H2O, CO2 and soot with non-gray wall

Zhang, Zhongnong; Lou, Chun; Li, Zhi; Long, Yan

doi:10.1016/j.jqsrt.2020.107175

Cited by 23 publications

(8 citation statements)

References 33 publications

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“…Considering the occurrence of three-atom gases (CO 2 and H 2 O) and soot particles in the hydrocarbon diffusion flame, both of them contribute to the local volumetric entropy generation rate due to thermal radiation and chemistry reactions.

, and

can be calculated by Equations (2)–(5), respectively [ 16 , 24 ]:

where

is the absorption coefficient of the gas;

is the absorption coefficient of the soot particle;

is the spectral radiative intensity;

is the spectral radiative temperature;

is the conductivity coefficient of the medium;

is the mass diffusion coefficient of the k th species;

and

are the mole fraction and mass fraction of the k th species, respectively;

is the total number of chemical species,

= 723, and

= 6 is the total number of reactions in the DLR gas reaction mechanism and the HACA-based soot surface growth oxidation model,

…”

Section: Methodsmentioning

confidence: 99%

“…Shan et al [ 13 ] calculated and analyzed spectral radiative exergy distribution characteristics in one-dimensional (1-D) furnace cases. Furthermore, the effects of non-gray characteristics of three-atom gases (CO 2 and H 2 O), soot particles, and boundary walls on radiation entropy generation were evaluated [ 14 , 15 , 16 ]. Consequently, the relationships between flame temperature, soot formation, local entropy generation, and thermodynamic irreversibility in flames have been quantitatively analyzed [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamics Irreversibilities Analysis of Oxy-Fuel Diffusion Flames: The Effect of Oxygen Concentration

Yan

Tang

Wang

et al. 2022

Entropy

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In studies on the combustion process, thermodynamic analysis can be used to evaluate the irreversibility of the combustion process and improve energy utilization efficiency. In this paper, the combustion process of a laminar oxy-fuel diffusion flame was simulated, and the entropy generation due to the irreversibilities of the radiation process, the heat conduction and heat convection process, the mass diffusion process, and the chemical reaction process was calculated. The effect of the oxygen concentration in the oxidizer on the entropy generation was analyzed. The results indicated that, as the oxygen concentration in the oxidizer increases, the radiative entropy generation first increases and then decreases, and the convective and conductive entropy generation, the mass diffusion entropy generation, the chemical entropy generation, and the total entropy generation gradually increase.

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, and

can be calculated by Equations (2)–(5), respectively [ 16 , 24 ]:

where

is the absorption coefficient of the gas;

is the absorption coefficient of the soot particle;

is the spectral radiative intensity;

is the spectral radiative temperature;

is the conductivity coefficient of the medium;

is the mass diffusion coefficient of the k th species;

and

are the mole fraction and mass fraction of the k th species, respectively;

is the total number of chemical species,

= 723, and

= 6 is the total number of reactions in the DLR gas reaction mechanism and the HACA-based soot surface growth oxidation model,

…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermodynamics Irreversibilities Analysis of Oxy-Fuel Diffusion Flames: The Effect of Oxygen Concentration

Yan

Tang

Wang

et al. 2022

Entropy

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“…Numerical outcomes of heat transfer analysis in hybrid (silver-water) nanoliquid with entropy rate in an annulus fin are investigated by Shahsavar et al 29 Few studies about entropy optimization have been discussed by Refs. [30][31][32][33][34][35][36][37][38][39][40] This investigation examines flow of Titanium oxide and Graphene oxide nanoparticles (TiO2 À GO) base fluid flow with irreversibility. Heat transfer associated to viscous dissipation and thermal radiation is examined.…”

Section: Introductionmentioning

confidence: 99%

Computational treatment of statistical declaration probable error for flow of nanomaterials with irreversibility

Hayat

Ahmad

Khan

et al. 2022

Advances in Mechanical Engineering

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The current investigation deals with entropy analysis for radiative flow of nanomaterials between two heated rotating disks. Titanium ([Formula: see text] and [Formula: see text]) and Graphene oxides are taken as nanoparticles. Water ([Formula: see text]) is used as a conventional base liquid. Dissipation and radiation effects are incorporated in energy equation. Rotating disks have different angular velocities. Both disks have different stretching rates. Attention is focused for statistical declaration and probable error. Physical feature of entropy analysis is studied through thermodynamics second law. Nonlinear partial system (PDEs) is reduced to ordinary one (ODEs). Homotopy analysis technique (HAM) is used for convergent series solution. Features of sundry variables on entropy optimization, temperature, Bejan number, and velocity are discussed for both nanoparticles ([Formula: see text] and [Formula: see text]). Computational outcomes for velocity gradient and Nusselt number are addressed through tabulated values. For larger Reynold number the radial and axial velocities are decreased. Temperature is augmented for against higher Eckert number and radiation parameter. Bejan number and entropy rate are augmented versus radiation parameter. Bejan number and Entropy rate have opposite trend via Reynold number. Statistical declaration and probable error are deliberated via Tables.

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“…Datta [ 17 , 18 ] calculated the entropy generation in a laminar jet diffusion flame, and he analyzed the effect of gravity on the rate of entropy generation. Meanwhile, Lou et al [ 19 , 20 , 21 , 22 , 23 ] calculated the radiative entropy generation in flames, and they also investigated the effects of soot and temperature on entropy generation in hydrocarbon flames. Recently, the thermodynamics second-law analysis of the combustion process of hydrogen has received extensive attention.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Exergy Loss of Ammonia Addition in Hydrocarbon Diffusion Flames

Sun

Zhang

Sun

et al. 2022

Entropy

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In this paper, a theoretical numerical analysis of the thermodynamics second law in ammonia/ethylene counter-flow diffusion flames is carried out. The combustion process, which includes heat and mass transfer, as well as a chemical reaction, is simulated based on a detailed chemical reaction model. Entropy generation and exergy loss due to various reasons in ammonia/ethylene and argon/ethylene flames are calculated. The effects of ammonia addition on the thermodynamics efficiency of combustion are investigated. Based on thermodynamics analysis, a parameter, the lowest emission of pollutant (LEP), is proposed to establish a relationship between the available work and pollutant emissions produced during the combustion process. Chemical reaction paths are also analyzed by combining the chemical entropy generation, and some important chemical reactions and substances are identified. The numerical results reveal that ammonia addition has a significant enhancement on heat transfer and chemical reaction in the flames, and the total exergy loss rate increases slightly at first and then decreases with an increase in ammonia concentration. Considering the factors of thermodynamic efficiency, the emissions of CO2 and NOx reach a maximum when ammonia concentration is near 10% and 30%, respectively. In terms of the chemical reaction path analysis, ammonia pyrolysis and nitrogen production increase significantly, while ethylene pyrolysis and carbon monoxide production decrease when ammonia is added to hydrocarbon diffusion flames.

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Evaluation of radiative entropy generation in a high temperature system including H2O, CO2 and soot with non-gray wall

Cited by 23 publications

References 33 publications

Thermodynamics Irreversibilities Analysis of Oxy-Fuel Diffusion Flames: The Effect of Oxygen Concentration

Thermodynamics Irreversibilities Analysis of Oxy-Fuel Diffusion Flames: The Effect of Oxygen Concentration

Computational treatment of statistical declaration probable error for flow of nanomaterials with irreversibility

Numerical Investigation of Exergy Loss of Ammonia Addition in Hydrocarbon Diffusion Flames

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