DOI: https://doi.org/10.20535/2305-9001.2013.68.36145

CALCULATION OF TRANSMITTANCES OF SPHERICAL WATER DROPLETS FOR THE TYPICAL SPECTRA OF FIRE THERMAL RADIATION

А. Г. Виноградов

Abstract


Purpose. Development of calculated techniques for thermal radiation shielding by a water curtain and performing numerical calculations of a transmittance of water droplet for the main types of spectra of a fire thermal radiation.
Methodology. According to literary data, in most cases the fire radiation spectra can be considered as the sum of two principal components: 1) black body emission spectrum; 2) molecular emission bands of gaseous products of combustion. For mathematical model operation these spectra are presented in the form of the linear combination of these components, in which the relative contribution of molecular emission bands is set by the ψ parameter. The transmittance of a spherical water droplet for such thermal radiation is calculated by means of earlier developed mathematical model.
Findings. Graphic dependences of a transmittance of water droplet from its diameter for the ψ parameter defined values corresponding to different types of fires are received. As a result of calculations it is found that the droplet transmittance decreases at ψ increase.
Application of results. Determination of optimum parameters of water spray curtain for of the thermal radiation attenuation during fire suppression


Keywords


water curtain; transmittance; fire radiation spectra.

References


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GOST Style Citations


1. Ravigururajan T.S. A Model for Attenuation of Fire Radiation Through Water Droplets / T.S. Ravigururajan, M.R. Beltan // Fire Safety J., 1989. – Vol. 15. – P. 171–181.


2. Coppalle A. Fire protection: water curtains/ A. Coppalle, D. Nedelka, B. Bauer // Fire Safety J., 1993. – Vol. 20. – P. 241–55.


3. Yang W. The interaction of thermal radiation and water mist in fire suppression / W. Yang, T. Parker, H. Ladouceur, R. Kee // Fire Safety J., 2004. – Vol. 39. – P. 41–66.


4. Buchlin J.-M. Thermal shielding by water spray curtain [Электронный ресурс] / J.-M. Buchlin // J. Loss Prev. Process Industries, 2005. – Vol. 18, No. 4-6. – P. 423–432. – URL: http://www.iitk.ac.in/che/jpg/papersb/full%20papers/B-%2071.pdf


5. Collin A. On radiative transfer in water spray curtains using the discrete ordinates method / A. Collin, P. Boulet, D. Lacroix, G. Jeandel // J. Quant. Spectrosc. Radiat. Transfer, 2005. – Vol. 92. – P. 85–110.


6. Boulet P. Heat transfer through a water spray curtain under the effect of a strong radiative source [Электронный ресурс] / P. Boulet, A. Collin, G. Parent // Fire Safety J., 2006. – 41(1). – P. 15–30. – URL: http://hal.archivesouvertes.fr/docs/00/11/37/28/PDF/Boulet2006.pdf


7. Collin A. Water mist and radiation interactions: application to a water curtain used as a radiative shield / A. Collin, S. Lechene, P. Boulet, G. Parent // Numerical Heat Transfer, Part A: Applications, 2010. – Volume 57. – P. 537-553.


8. Benbrik A. Contribution to Fire Protection of the LNG Storage Tank Using Water Curtain / A. Benbrik, M. Cherifi, S. Meftah, M.S. Khelifi, K. Sahnoune// Int. J. of Thermal & Environmental Engineering, 2011. – Volume 2. – No. 2. – P. 91-98.


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11. Виноградов А.Г. Экранирование теплового излучения полидисперсными водяными завесами / А.Г. Виноградов // Пожаровзрывобезопасность. – 2013.– Т. 22.


12. Виноградов А.Г. Поглощение лучистого теплового потока в распыленной водяной струе / А.Г. Виноградов // Вісник Національного технічного університету України «Київський політехнічний інститут», сер. Машинобудування. – 2012. – №65. – С. 145-152.


13. Försth M. Absorption of heat radiation in liquid droplets / M. Försth, K. Möller // SP Report 2011:75. Boras SE: Fire Technology, SP Technical Research Institute of Sweden. – 57 p. – URL: http://wwwv2. sp.se/publ/ViewDocument.aspx?RapportId=13090


14. Modest M.F. Radiative Heat Transfer / M.F. Modest. – Academic Press, 2003. – 822 p.


15. Buckius R.O. Infrared Flame Radiation / R.O. Buckius, C.L. Tien // International Journal of Heat and Mass Transfer, 1977. vol. 20, no. 2. – P. 93-106.


16. Hertzberg M. The infrared radiance and the optical detection of fires and explosions / M. Hertzberg, C.D. Litton, W.F. Donaldson, D. Burgess // Symposium (International) on Combustion, 1975. – vol. 15, no. 1. – P. 137-144.


17. Parent G. Measurement of infrared radiation emitted by the flame of a vegetation fire / G. Parent, Z. Acem, S. Lechêne, P. Boulet // International Journal of Thermal Sciences, 2010. – vol. 49. – P. 555-562. ISSN 2305-9001. Вісник НТУУ «КПІ». Серiя машинобудування №2 (68). 2013 115


18. Parent G. Radiative flux emitted by a burning PMMA slab / G. Parent, Z. Acem, A. Collin, R. Berfroi, P. Boulet, Y. Pizzo, P. Mindykowski, A. Kaiss, B. Porterie // Journal of Physics: Conference Series, 2012. – vol. 395. – P. 012153. – URL: http://iopscience.iop.org/1742-6596/395/1/012153/pdf/1742-6596_395_1_012153.pdf


19. Parent G. Radiative properties in the frame of forest fires / G. Parent, Z. Acem, A. Collin, P. Boulet // Proc. 6th International Symposium on Radiative Transfer, 2010. – URL: http://perso.ensem.inplnancy.fr/Anthony.Collin/Conferences/Conference2010A.pdf


20. Hägglund B. The heat radiation from petroleum fires / B. Hägglund, L.E. Persson // FOA Report, C20126-D6 (A3), Forsvarets Forskningsanstalt, Stockholm, 1976.


21. Klassen M. Structure and radiation properties of pool fires / M. Klassen, J.P. Gore // NIST, 1994. – NIST-GCR-94-651. – 153р.


22. Hale G. M. Optical Constants of Water in the 200 nm to 200 mm Wavelength Region / G. M. Hale, M. P. Querry // Appl. Optics, 1973. – Vol. 12, No. 3. – P. 555–563.





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