Transient conduction with counter mass flow in wood Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/np193d788

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  • This paper deals with the thermal decompositon of wood slabs under fire conditions. The partial differential equation is solved numerically by the use of an implicit finite difference method. Wood is treated as two components, Lignin and Hemicellulose on one side, and Cellulose on the other side. The chemical reactions are assumed to have Arrhenius type kinetics. The pyrolysis is represented by three first order reactions from which two are exothermic and one is endothermic. The temperature dependence of the properties is approximated by first and second order equations. The gas mixture is treated as an ideal gas mixture. Two boundary conditions are considered: constant heat flux and convection. Temperature and density profiles are computed for both. From this, the ablating velocity of the wood/char surface is determined. For high incident heat fluxes the ablating velocity is found to be nearly constant while for lower heat sources the velocity is time dependent. It is also found that under fire condition the reaction only takes place in a thin layer at the surface (1-3 mm). The thickness is dependent on the conductivity and the heat source.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2013-08-01T14:23:02Z (GMT) No. of bitstreams: 1 PfeifferNikolaus1984.pdf: 842861 bytes, checksum: c5e31916a89c771734ac5f045b142250 (MD5)
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