Numerical simulation of the glowing combustion of moist wood by means of a front-based model

Authors

  • Antonio Galgano,

    1. Istituto di Ricerche sulla Combustione, C.N.R., Napoli, Italy
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  • Colomba Di Blasi,

    Corresponding author
    1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli "Federico II", Napoli, Italy
    • Correspondence to: Colomba Di Blasi, Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, University of Napoli " Federico II" , P.le V. Tecchio, Napoli 80125, Italy.

      E-mail: diblasi@unina.it

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  • Sergio Ritondale,

    1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli "Federico II", Napoli, Italy
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  • Andrea Todisco

    1. Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale, Università degli Studi di Napoli "Federico II", Napoli, Italy
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ABSTRACT

A model is presented for the glowing combustion of thick moist wood samples exposed to fire-level heat fluxes. It includes the description of all the relevant heat and mass transfer phenomena and assumes that the thermally controlled drying, the finite-rate kinetics pyrolysis, and the mixed kinetic-diffusive controlled combustion take place at infinitely thin fronts. The solution, based on the integral method, shows that apart from short initial and final transients, an ablation regime is established given high external heat fluxes and/or high moisture contents, high wood density and thermal conductivity, and low char density. Drying, pyrolysis, and combustion take place simultaneously along a constant-thickness layer that propagates at a constant rate (the same for the three fronts) towards the cold sample side. Good quantitative agreement is obtained between model predictions and measurements. Copyright © 2013 John Wiley & Sons, Ltd.

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