Thermal-ignition analysis in boundary-layer flows

Chung King Law, H. K. Law

Research output: Contribution to journalArticle

46 Scopus citations

Abstract

The weakly reactive state leading to the ignition of a steady laminar boundary-layer flow of a combustible mixture over a hot, isothermal, non-permeable, non-catalytic flat plate is studied both numerically and using matched asymptotic analysis in the realistic limit of large activation energy. It is shown that the flow consists of a locally similar diffusive-reactive region next to the plate and a non-similar diffusive-convective region outside it; that the analytic solution obtained reproduces the lower half of the S-shaped ignition-extinction response curve such that ignition is expected to occur when a suitably defined Damköhler number, which increases with the streamwise distance, reaches unity; and that at the point of ignition the heat transfer from the wall vanishes identically. An explicit expression for the minimum distance for ignition to occur is also derived.

Original languageEnglish (US)
Pages (from-to)97-108
Number of pages12
JournalJournal of Fluid Mechanics
Volume92
Issue number1
DOIs
StatePublished - Jan 1 1979
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Mechanics of Materials
  • Condensed Matter Physics
  • Computational Mechanics
  • Physics and Astronomy(all)

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