Graduate Thesis Or Dissertation
 

Transient conduction with counter mass flow in wood

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/np193d788

Descriptions

Attribute NameValues
Creator
Abstract
  • 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.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome) using ScandAll PRO 1.8.1 on a Fi-6670 in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details PfeifferNikolaus1984.pdf 2017-08-23 Public Download