165045 20251204150239.0 doi 10.1016/j.combustflame.2014.11.034 sideral 91983 ART-2015-91983 eng Dopazo, C. Universidad de Zaragoza (orcid)0000-0002-2267-8598 Strain rates normal to approaching iso-scalar surfaces in a turbulent premixed flame 2015 A Direct Numerical Simulation (DNS) dataset of a turbulent premixed propagating flame with an Arrhenius one-step chemistry in an input–output configuration is examined. Combustion takes place in the ‘corrugated flamelets’ regime. Heat release causes the flow volumetric dilatation rate to be positive over most of the computational domain, with associated positive strain rates normal to iso-scalar surfaces and both positive or negative strain rates tangent to them. The normal propagation of convex and concave iso-surface infinitesimal area elements produces stretching and reduction, respectively, superposed to tangential flow strain rate effects. The normal propagation speed of iso-surfaces increases monotonically from ‘fresh gases’ to ‘hot products’, which draws two adjacent ones closer; this contribution, due to both chemistry and molecular diffusive transport, is much greater than that of the normal flow strain, and enhances mixing and chemical conversion. Many aspects of turbulent premixed flames traditionally explained in terms of tangential strain rates can likely be well understood using the normal ones. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.168 2015 ENERGY & FUELS 16 / 88 = 0.182 2015 Q1 T1 ENGINEERING, CHEMICAL 15 / 135 = 0.111 2015 Q1 T1 ENGINEERING, MULTIDISCIPLINARY 3 / 85 = 0.035 2015 Q1 T1 THERMODYNAMICS 4 / 57 = 0.07 2015 Q1 T1 ENGINEERING, MECHANICAL 3 / 131 = 0.023 2015 Q1 T1 2.807 2015 Chemical Engineering (miscellaneous) 2015 Q1 Chemistry (miscellaneous) 2015 Q1 Physics and Astronomy (miscellaneous) 2015 Q1 Fuel Technology 2015 Q1 Energy Engineering and Power Technology 2015 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Cifuentes, L. Universidad de Zaragoza Martin, J. Universidad de Zaragoza (orcid)0000-0003-3908-0493 Jimenez, C. 5001 600 Universidad de Zaragoza Dpto. Ciencia Tecnol.Mater.Fl. Área Mecánica de Fluidos 162, 5 (2015), 1729-1736 Combust. flame Combustion and Flame 0010-2180 1576275 http://zaguan.unizar.es/record/165045/files/texto_completo.pdf Versión publicada 2755922 http://zaguan.unizar.es/record/165045/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:165045 articulos driver 2025-12-04-14:39:56 ARTICLE