Numerical model of upward flame spread on practical wall materials

Abstract The focus of this paper is the development of a thermal, finite difference numerical model to describe one-dimensional upward flame spread on practical wall materials. Practical materials include composite materials and those that char, in addition to clean burning, homogeneous materials. A set of equations used in the model is developed and the methods for obtaining necessary “fire properties” are discussed. Some of the particular features of the model include the use of a correlation for flame heat feedback and the use of an experimentally measured mass loss rate to incorporate the burning characteristics of practical materials. A comparison of the numerical predictions with the experimental results for flame heights and temperatures are shown for Douglas fir particle board. The model correctly predicts trends but underpredicts the flame heights and pyrolysis height in the cases tested. Two additional cases are shown for materials for which experimentally measured heat release rate data are used in place of the mass loss rate data. The flame and pyrolysis height predictions are in much better agreement for these cases. Further efforts to obtain material property data that is appropriate for flame spread modeling is indicated by this work.

[1]  Ellen G. Brehob,et al.  Experimental measurements of upward flame spread on a vertical wall with external radiation , 1998 .

[2]  William Parker,et al.  Prediction Of The Heat Release Rate Of Wood , 1986 .

[3]  K. Saito,et al.  Effect Of External Radiant Heat Flux On Upward Fire Spread: Measurements On Plywood And Numerical Predictions , 1994 .

[4]  H. Mitler.  Predicting the spread rates of fires on vertical surfaces , 1991 .

[5]  J. G. Quintiere,et al.  A Framework For Utilizing Fire Property Tests , 1991 .

[6]  Patrick J. Pagni,et al.  Fire safety science : proceedings of the first international symposium , 1986 .

[7]  Forman A. Williams,et al.  Upward Turbulent Flame Spread on Wood Under External Radiation , 1985 .

[8]  Forman A. Williams,et al.  Upward Turbulent Flame Spread , 1986 .

[9]  J. Quintiere,et al.  Wall Flames and Implications for Upward Flame Spread , 1986 .

[10]  A. Kulkarni,et al.  Heat Loss to the Interior of a Free Burning Vertical Wall and its Influence on Estimation of Effective Heat of Gasification , 1990 .

[11]  Yuji Hasemi,et al.  Upward Flame Spread Along A Vertical Solid For Transient Local Heat Release Rate , 1994 .

[12]  W. J. Parker,et al.  Upward Flame Spread On Wooden Surface Products: Experiments And Numerical Modelling , 1997 .

[13]  Ellen G. Brehob,et al.  Time‐dependent mass loss rate behavior of wall materials under external radiation , 1993 .

[14]  Yuji Hasemi.  THERMAL MODELING OF UPWARD WALL FLAME SPREAD. , 1986 .

[15]  A. C. Fernandez-Pello,et al.  Upward Laminar Flame Spread Under the Influence of Externally Applied Thermal Radiation , 1977 .

[16]  Philip Thomas,et al.  On upward flame spread on thick fuels , 1990 .

[17]  F. Incropera,et al.  Fundamentals of Heat Transfer , 1981 .

[18]  Craig Beyler,et al.  A Computer Model Of Upward Flame Spread On Vertical Surfaces , 1997 .

[19]  G. H. Markstein,et al.  Upward turbulent fire spread and burning of fuel surface , 1975 .

[20]  M. Sibulkin,et al.  The Dependence of Flame Propagation on Surface Heat Transfer II. Upward Burning , 1976 .

[21]  G. Cox,et al.  Fire safety science : proceedings of the third international symposium , 1991 .

[22]  Thomas G. Cleary,et al.  Upward flame spread on composite materials , 1999 .