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Assessment of Radiation Solvers for Fire Simulation Models Using RADNNET-ZM

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The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology (AOSFST 2018)

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Abstract

The paper presents a neural-network-based zonal method (RADNNET-ZM) for the analysis of radiative heat transfer in an arbitrary Cartesian enclosure with an isothermal, homogeneous, non-gray medium. The model accounts for the non-gray effect of absorbing species in a combustion environment and the geometric effect of any three-dimensional enclosures. The model is verified against benchmark solutions. Maximum local error is observed to be less than 4%. Prediction accuracy of an existing zonal radiation solver is assessed. Results demonstrate that RADNNET-ZM can provide a substantial improvement to zone fire simulation models for the prediction of radiative heat transfer without a significant increase in computation cost.

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Abbreviations

a λ :

Local absorption coefficient

A i :

Elemental area i

D :

Grid size of discretization

e λb :

Planck function

f v :

Soot volume fraction

F ij :

View factor between Ai and Aj

F ss,xx :

Generic exchange factor (xx = pd, pp)

L ij,xx :

Center-to-center distance between Ai and Aj (xx = pd, pp)

L pd,x :

Mean beam length between two perpendicular elemental areas (x = soot, gas)

L pp :

Mean beam length between two parallel elemental areas

nx, ny, nz:

Dimensionless distances for Aj relative to Ai

\(P_{{{\text{CO}}_{2} }}\) :

Partial pressure of CO2

\(P_{{{\text{H}}_{2}{\text{O}} }}\) :

Partial pressure of H2O

P g :

Total pressure of an N2/H2O/CO2 mixture

\(\dot{q}_{\text{g}}^{\prime \prime }\) :

Incident heat flux due to emission of mixture medium

\(\dot{q}_{\text{w}}^{\prime \prime }\) :

Incident heat flux due to emission of wall

ss:

Surface–surface exchange factor

SS:

Total surface–surface exchange factor

T g :

Gas temperature

T w :

Wall temperature

\(X_{{{\text{CO}}_{2} }}\) :

Mole fraction of CO2

X, Y, Z:

Dimensions of an enclosure

α :

Total absorptivity (sum of soot and gas absorptivity)

α s :

Soot absorptivity

Δα:

Gas absorptivity

β xx :

Normalized mean beam length (xx = pd, pp)

λ :

Wavelength

ε :

Emissivity of gas mixture

σ :

Stefan–Boltzmann constant

pd:

Perpendicular

pp:

Parallel

References

  1. Hottel, H. C., & Sarofim, A. F. (1967). Radiative transfer. McGraw-Hill.

    Google Scholar 

  2. Fiveland, W. A. (1987). Discrete ordinate methods for radiative heat transfer in isotropically and anisotropically scattering media. Journal of Heat Transfer, 109(3), 809–812.

    Article  Google Scholar 

  3. Carvalho, M., Farias, T., & Fontes, P. (1991). Predicting radiative heat transfer in absorbing, emitting, and scattering media using the discrete transfer method. Fundamentals of radiation heat transfer, 160(1), 17–26.

    Google Scholar 

  4. Grosshandler, W. L. (1993). RADCAL: A narrow-band model for radiation calculations in a combustion environment. Gaithersburg, MD: National Institute of Standards and Technology.

    Google Scholar 

  5. Mazumder, S., & Modest, M. F. (2002). Application of the full spectrum correlated-k distribution approach to modeling non-gray radiation in combustion gases. Combustion and Flame, 129(4), 416–438.

    Article  Google Scholar 

  6. Cumber, P. S., Fairweather, M., & Ledin, H. S. (1998). Application of wide band radiation models to non-homogeneous combustion systems. International Journal of Heat and Mass Transfer, 41(11), 1573–1584.

    Article  Google Scholar 

  7. Choi, C. E., & Baek, S. W. (1996). Numerical analysis of a spray combustion with nongray radiation using weighted sum of gray gases model. Combustion Science and Technology, 115(4–6), 297–315.

    Article  Google Scholar 

  8. Yuen, W. W., Tam, W. C., & Chow, W. K. (2014). Assessment of radiative heat transfer characteristics of a combustion mixture in a three-dimensional enclosure using RAD-NETT (with application to a fire resistance test furnace). International Journal of Heat and Mass Transfer, 68, 383–390.

    Article  Google Scholar 

  9. Yuen, W. W. (2009). RAD-NNET, a neural network based correlation developed for a realistic simulation of the non-gray radiative heat transfer effect in three-dimensional gas-particle mixtures. International Journal of Heat and Mass Transfer, 52(13), 3159–3168.

    Article  Google Scholar 

  10. Tam, W. C. (2013). Analysis of heat transfer in a building structure accounting for the realistic effect of thermal radiation heat transfer (Ph.D. thesis). The Hong Kong Polytechnic University, Hong Kong, China.

    Google Scholar 

  11. Peacock, R. D., McGrattan, K. B., Forney, G. P., & Reneke, P. A. (2015). CFAST—Consolidated fire and smoke transport (version 7). Volume 1: Technical reference guide. Technical Note, NIST, Gaithersburg, Maryland, 1, pp. 69–71.

    Google Scholar 

  12. McGrattan, K., Hostikka, S., McDermott, R., Floyd, J., Weinschenk, C., & Overholt, K. (2013). Fire dynamics simulator technical reference guide volume 1: mathematical model. NIST Special Publication, 1018(1), 175.

    Google Scholar 

  13. Fluent, A. N. S. Y. S. (2011). Ansys fluent theory guide. ANSYS Inc., USA, 15317, pp. 724–746.

    Google Scholar 

  14. Yuen, W. W., & Takara, E. E. (1997). The zonal method: A practical solution method for radiative transfer in nonisothermal inhomogeneous media. Annual Review of Heat Transfer 8(8).

    Google Scholar 

  15. Yuen, W. W., & Tam, W. C. (In preparation). RADNNET-ZM—The generalized zonal method for radiative transfer in multi-dimensional non-gray media.

    Google Scholar 

  16. Liu, F. (1999). Numerical solutions of three-dimensional non-gray gas radiative transfer using the statistical narrow-band model. Journal of Heat Transfer, 121(1), 200–203.

    Article  Google Scholar 

  17. Coelho, P. J. (2002). Numerical simulation of radiative heat transfer from non-gray gases in three-dimensional enclosures. Journal of Quantitative Spectroscopy and Radiative Transfer, 74(3), 307–328.

    Article  Google Scholar 

  18. Yuen, W. W. (2014). Development of the concept of mean temperatures in the analysis of radiative heat transfer in an inhomogeneous non-isothermal non-gray medium. International Journal of Heat and Mass Transfer, 68, 259–268.

    Article  Google Scholar 

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Acknowledgements

The authors would like to thank Kevin B. McGrattan for his constructive comments and valuable suggestions to this manuscript.

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Authors and Affiliations

  1. Fire Research Division, National Institute of Standards and Technology, Gaithersburg, MD, USA

    Wai Cheong Tam

  2. Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, CA, USA

    Walter W. Yuen

Authors
  1. Wai Cheong Tam
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  2. Walter W. Yuen
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Corresponding author

Correspondence to Wai Cheong Tam .

Editor information

Editors and Affiliations

  1. Department of Fire Science, Central Police University, Taoyuan City, Taiwan

    Guan-Yuan Wu

  2. National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan

    Kuang-Chung Tsai

  3. Hong Kong Polytechnic University, Hong Kong, China

    W. K. Chow

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Tam, W.C., Yuen, W.W. (2020). Assessment of Radiation Solvers for Fire Simulation Models Using RADNNET-ZM. In: Wu, GY., Tsai, KC., Chow, W.K. (eds) The Proceedings of 11th Asia-Oceania Symposium on Fire Science and Technology. AOSFST 2018. Springer, Singapore. https://doi.org/10.1007/978-981-32-9139-3_10

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  • DOI: https://doi.org/10.1007/978-981-32-9139-3_10

  • Publisher Name: Springer, Singapore

  • Print ISBN: 978-981-32-9138-6

  • Online ISBN: 978-981-32-9139-3

  • eBook Packages: EngineeringEngineering (R0)

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