A continuum-mechanical derivation of the conservation equations for the pyrolysis and combustion of wood

Indrek Wichman

Research output: Book/ReportReport

1 Citation (Scopus)

Abstract

The equations for conservation of mass, species and energy for both the gas and solid phases are averaged over a characteristic wood volume element during pyrolysis or combustion. The presence of a pure liquid phase in wood is neglected in this study. The wood sample is assumed to obey the continuum hypothesis once phase averaging is completed. Heat conduction, adsorption (and desorption) and chemical reaction occur at the interface between gas and solid. Overall conservation equations are written for mass and energy; the species equations for the two phases are kept separate. Integration of the momentum for the gas phase produces an expression for the velocity field in the sample. Simplified equations are written for two limiting cases of significant practical interest.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages46
ISBN (Print)951-38-3373-9
Publication statusPublished - 1989
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Volume591
ISSN0358-5077

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Keywords

  • wood
  • combustion
  • pyrolysis
  • equations
  • theories

Cite this

Wichman, I. (1989). A continuum-mechanical derivation of the conservation equations for the pyrolysis and combustion of wood. VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, Vol.. 591