Effects of gravity on structure and entropy generation of confined laminar diffusion flames

Datta, Amitava

doi:10.1016/j.ijthermalsci.2004.10.003

Cited by 48 publications

(28 citation statements)

References 22 publications

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“…The early reports on entropy generation during combustion process have indicated that the entropy generation due to body forces is negligible [27,30]. However, in order to quantitatively predict the order of magnitude of the entropy generation rates due to viscous dissipation and body force, contours of the same have been presented in a few cases.…”

Section: Numerical Modelmentioning

confidence: 99%

“…Effect of oxygen mass fraction on local entropy generation rate in a methane-air burner has been numerically studied by Yapici et al [29]. Recently, effects of gravity on structure and entropy generation of confined laminar diffusion flames has been investigated by Datta [30], where it has been shown that the entropy generation due to heat transfer increases with the strength of the gravitational field and the entropy generation due to the chemical reaction and mass transfer remains unaltered.…”

Section: Introductionmentioning

confidence: 99%

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Entropy generation during the quasi-steady burning of spherical fuel particles

Raghavan

Gogos

Babu

et al. 2007

International Journal of Thermal Sciences

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Section: Numerical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Entropy generation during the quasi-steady burning of spherical fuel particles

Raghavan

Gogos

Babu

et al. 2007

International Journal of Thermal Sciences

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“…Nishida et al [26] considered premixed and diffusion flames and identified important entropy generation and exergy loss mechanisms. Datta [27] studied the effect of gravity on the structure and generation of entropy in confined laminar diffusion flames. Shuja et al [28] studied the influence of inlet velocity profile on the efficiency of heat transfer in a laminar jet.…”

Section: Introductionmentioning

confidence: 99%

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Safari

Hadi

Sheikhi

2014

Entropy

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An overview is presented of the recent developments in the application of large eddy simulation (LES) for prediction and analysis of local entropy generation in turbulent reacting flows. A challenging issue in such LES is subgrid-scale (SGS) modeling of filtered entropy generation terms. An effective closure strategy, recently developed, is based on the filtered density function (FDF) methodology with inclusion of entropy variations. This methodology, titled entropy FDF (En-FDF), is the main focus of this article. The En-FDF has been introduced as the joint velocity-scalar-turbulent frequency-entropy FDF and the marginal scalar-entropy FDF. Both formulations contain the chemical reaction and its entropy generation effects in closed forms. The former constitutes the most comprehensive form of the En-FDF and provides closure for all of the unclosed terms in LES transport equations. The latter is the marginal En-FDF and accounts for entropy generation effects, as well as scalar-entropy statistics. The En-FDF methodologies are described, and some of their recent predictions of entropy statistics and entropy generation in turbulent shear flows are presented.

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“…A comprehensive review of thermodynamic irreversibilities and exergy analysis associated with the combustion of gaseous, liquid and solid fuels has been presented by Datta and Som [3]. Datta [4] has also studied the effects of gravity on structure and entropy production of a confined, co-flowing, laminar jet diffusion flame. In order to clarify the reasons for large exergy destruction during combustion processes, Nishida et al [5] have evaluated the local entropy production and exergy loss for premixed and diffusion flames.…”

Section: Introductionmentioning

confidence: 99%

Entropy production analysis of swirling diffusion combustion processes

Makhanlall

2009

Front. Energy Power Eng. China

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A critical factor in the design of combustion systems for optimum fuel economy and emission performance lies in adequately predicting thermodynamic irreversibilities associated with transport and chemical processes. The objective of this study is to map these irreversibilities in terms of entropy production for methane combustion. The numerical solution of the combustion process is conducted with the help of a Fluent 6.1.22 computer code, and the volumetric entropy production rate due to chemical reaction, viscous dissipation, and mass and heat transfer are calculated as post-processed quantities with the computed data of the reaction rates, fluid velocity, temperature and radiative intensity. This paper shows that radiative heat transfer, which is an important source of entropy production, cannot be omitted for combustion systems. The study is extended by conducting a parametric investigation to include the effects of wall emissivity, optical thickness, swirl number, and Boltzmann number on entropy production. Global entropy production rates decrease with the increase in swirl velocity, wall emissivity and optical thickness. Introducing swirling air into the combustion system and operations with the appropriate Boltzmann number reduces the irreversibility affected regions and improves energy utilization efficiency.

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Effects of gravity on structure and entropy generation of confined laminar diffusion flames

Cited by 48 publications

References 22 publications

Entropy generation during the quasi-steady burning of spherical fuel particles

Entropy generation during the quasi-steady burning of spherical fuel particles

Progress in the Prediction of Entropy Generation in Turbulent Reacting Flows Using Large Eddy Simulation

Entropy production analysis of swirling diffusion combustion processes

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