Asymptotic structure of laminar diffusion flames at high pressure

Document Type

Article

Publication Date

9-17-2012

Abstract

We analyze the structure of laminar diffusion flames at high pressure in the limit of large activation energy for the particular configuration of a steady flame in counterflow. We consider a dense fluid in which normal Fickian diffusion of the fuel is limitedthermal diffusion, i.e., the Soret effect, is the dominant mechanism for fuel mass transport. Temperature and species profiles, as well as flame temperature and location, are determined as a function of Damköhler number and Soret diffusion coefficient. In particular, we find that oxidant is entirely consumed by the flame, while some fuel leaks through. For light fuels, the fuel profile is found to have a local peak on the oxidant side as a result of thermal diffusion. Our analysis includes a description of extinction phenomena, including explicit criteria in terms of the Soret diffusion coefficient, ratio of temperature of the two streamsthe Damköhler number at extinction. © 2012 American Institute of Physics.

Identifier

84867121945 (Scopus)

Publication Title

Physics of Fluids

External Full Text Location

https://doi.org/10.1063/1.4748344

ISSN

10706631

Issue

9

Volume

24

Grant

DMS-0807340

Fund Ref

National Science Foundation

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