Similarity solutions and applications to turbulent upward flame spread on non-charring materials

Michael A. Delichatsios, Mary Delichatsios, Y. Chen, Yuji Hasemi

研究成果: Conference contribution

1 引用 (Scopus)

抄録

Turbulent upward flame spread on non-charring materials (for pyrolysis lengths less than 1.8 m) is shown to be directly predicted by using measurable flammability parameters. The controlling parameters are: a combustion related length scale which is proportional to (dq″net ΔHc/ΔHv)2, a pyrolysis or ignition time τp, and a transient pyrolysis parameter: λ = L/c ΔTp = ratio of the latent heat to the sensible heat of the pyrolysis temperature of the material. In the length scale parameter, dq″net is the total net heat flux from the flames to the wall (i.e. total heat flux minus reradiation losses), ΔHc is the heat of combustion and ΔHv is an effective heat of gasification for the material. The pyrolysis or ignition time depends (for thermally thick conditions) on the material thermal inertia, the pyrolysis temperature and the total heat flux from the flames to the wall, dq″fw. The controlling parameters were developed by using a numerical simulation, developed earlier, and new exact similarity solutions which complement existing similarity solutions. The predictions of the analysis are validated by comparison with upward flame spread experiments on PMMA. The present results are directly applicable for pyrolysis lengths less than 1.8 m over which experiments in practical materials show that the total (radiative and convective) heat flux to the wall from the flames is constant and nearly uniform over the flame length. As the pyrolysis length increases (>approx. 1.8 m), radiation dominates and a different total wall heat flux distribution applies.

元の言語English
ホスト出版物のタイトルAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
出版場所New York, NY, United States
出版者Publ by ASME
ページ21-28
ページ数8
223
ISBN(印刷物)0791810682
出版物ステータスPublished - 1992
外部発表Yes
イベントWinter Annual Meeting of the American Society of Mechanical Engineers - Anaheim, CA, USA
継続期間: 1992 11 81992 11 13

Other

OtherWinter Annual Meeting of the American Society of Mechanical Engineers
Anaheim, CA, USA
期間92/11/892/11/13

Fingerprint

Pyrolysis
Heat flux
Ignition
Enthalpy
Latent heat
Flammability
Polymethyl Methacrylate
Gasification
Experiments
Radiation
Temperature
Hot Temperature
Computer simulation

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering

これを引用

Delichatsios, M. A., Delichatsios, M., Chen, Y., & Hasemi, Y. (1992). Similarity solutions and applications to turbulent upward flame spread on non-charring materials. : American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD (巻 223, pp. 21-28). New York, NY, United States: Publ by ASME.

Similarity solutions and applications to turbulent upward flame spread on non-charring materials. / Delichatsios, Michael A.; Delichatsios, Mary; Chen, Y.; Hasemi, Yuji.

American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. 巻 223 New York, NY, United States : Publ by ASME, 1992. p. 21-28.

研究成果: Conference contribution

Delichatsios, MA, Delichatsios, M, Chen, Y & Hasemi, Y 1992, Similarity solutions and applications to turbulent upward flame spread on non-charring materials. : American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. 巻. 223, Publ by ASME, New York, NY, United States, pp. 21-28, Winter Annual Meeting of the American Society of Mechanical Engineers, Anaheim, CA, USA, 92/11/8.
Delichatsios MA, Delichatsios M, Chen Y, Hasemi Y. Similarity solutions and applications to turbulent upward flame spread on non-charring materials. : American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. 巻 223. New York, NY, United States: Publ by ASME. 1992. p. 21-28
Delichatsios, Michael A. ; Delichatsios, Mary ; Chen, Y. ; Hasemi, Yuji. / Similarity solutions and applications to turbulent upward flame spread on non-charring materials. American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD. 巻 223 New York, NY, United States : Publ by ASME, 1992. pp. 21-28
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