The modeling of the mean entropy generation rate due to combined actions of viscous dissipation, irreversible chemical reaction, thermal conduction and mass diffusion (i.e., , and ) in the context of Reynolds averaged Navier–Stokes (RANS) simulations has been analyzed in detail based on a direct numerical simulation (DNS) database with a range of different values of heat release parameter , global Lewis number Le, and turbulent Reynolds number spanning both the corrugated flamelets (CF) and thin reaction zones (TRZ) regimes of premixed turbulent combustion. It has been found that the entropy generation due to viscous dissipation remains negligible in comparison to the other mechanisms of entropy generation (i.e., , and ) within the flame for all cases considered here. A detailed scaling analysis has been used to explain the relative contributions of , and on the overall volumetric entropy generation rate in turbulent premixed flames. This scaling analysis is further utilized to propose models for , and in the context of RANS simulations. It has been demonstrated that the new proposed models satisfactorily predict , and for all cases considered here. The accuracies of the models for , and have been demonstrated to be closely linked to the modeling of dissipation rate of turbulent kinetic energy and scalar dissipation rates (SDRs) in turbulent premixed flames.
Modeling of Entropy Generation in Turbulent Premixed Flames for Reynolds Averaged Navier–Stokes Simulations: A Direct Numerical Simulation Analysis
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 31, 2014; final manuscript received September 9, 2014; published online October 21, 2014. Assoc. Editor: Reza H. Sheikhi.
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Chakraborty, N. (October 21, 2014). "Modeling of Entropy Generation in Turbulent Premixed Flames for Reynolds Averaged Navier–Stokes Simulations: A Direct Numerical Simulation Analysis." ASME. J. Energy Resour. Technol. May 2015; 137(3): 032201. https://doi.org/10.1115/1.4028693
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