Predicting charring rate of woods exposed to time-increasing and constant heat fluxes

✍ Scribed by Yang Lizhong; Zhou Yupeng; Wang Yafei; Guo Zaifu

• Book ID: 104019487
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 292 KB
• Volume: 81
• Category: Article
• ISSN: 0165-2370
• DOI: 10.1016/j.jaap.2007.06.006

✦ Synopsis

This paper describes an investigation of the charring of wood exposed to a time-increasing heat flux and constant heat fluxes by using a modified partial differential equation (PDE) model, whose calculated result is validated by experimental result under time-increasing heat fluxes. It is assumed that the base of the char layer can be defined by the temperature of 300 8C. The results have shown that the rate of increase of heat flux and the density of woods significantly affect the charring rate and the charring rate of woods under time-increasing heat fluxes is smaller than that exposed to a constant heat flux. Linear regression conducted on the predictions of charring depth with time as the dependent time-increasing was suitable for time-increasing heat fluxes, while power regression was more suitable for constant heat flux. A successful experiential expression, which describing the relationship among char rate of woods and the increasing rate of heat fluxes and density of wood, has been suggested under time-increasing heat fluxes.