Abstract
The effective diffusion coefficients in mine ventilation-flows had been obtained as 4 to 200 m2/s by matching the measured concentration-time curves with the advection-diffusion equation. The turbulent diffusion coefficients in the simple airways have good agreement with the equation proposed by Taylor. However, for complex airways in operating mines, the evaluated effective diffusion coefficients in the mines show higher values than that calculated by the Taylor’s equation. A numerical simulation model using with movements of discrete particles dosed into ventilation flows has been developed to simulate diffusion phenomena of gas or dust in mine airways. Numerical simulations had been conducted on distribution of tracers in single airways with ordinary profiles of mean velocity, velocity fluctuations and Reynolds stress. As one of results, long band of diffused particles is obtained at the single airway of 600 m in length, and large effective diffusion coefficient is evaluated as 20 m2/s.
Similar content being viewed by others
References
Hardcastle S G, Klinowski G, Mchaina D. Remedial mine ventilation planning-tracer gas definition of leakage routes[A]. Innovative Mine Design for the 21st Century[C]. Rotterdam: Balkema, 1993: 689–697.
Sasaki K, Dindiwe C. An integrated mine ventilation simulator “MIVENA Ver.6” with application[A]. Proceedings of the North American 9th US Mine Ventilation Symposium[C]. Canada, 2002: 181.
Taylor G I. Dispersion of soluble matter in solvent flowing slowly trough a tube[J]. Proc. R. Soc., 1953, 219: 186–203.
Taylor G I. The dispersion of matter in turbulent flow through a pipe[J]. Proc. R. Soc. 1954, 233: 446–468.
Pope S B. Consistency conditions for random-walk method of turbulent dispersion[J]. Phys. Fluids, 1987, 30(8): 2 374–2 379.
Widodo N P. Study on tracer gas method for mine ventilation measurement and evaluation of gas diffusion coefficient[D]. Fu Ruoka: Kyushu University, 2007.
Innova AirTech Instruments, Ventilation measurement and other tracer-gas applications[EB/OL]. http://www.innova.dk/Booklets.60.0.html, 2006.
Laufer J. The structure of turbulence in fully developed pipe flow[R]. N.A.C.A., 2001.
Rouse H. Advanced mechanics of fluids[M]. John Wiley and Sons, 1959.
Bear J. Dynamics of fluids in porous media[M]. Dover Publications, Inc., 1972.
Author information
Authors and Affiliations
Corresponding author
Additional information
Supported by the National Natural Science Foundation of China(50375026)
Rights and permissions
About this article
Cite this article
Arpa, G., Widiatmojo, A., Widodo, N.P. et al. Tracer gas measurement and simulation of turbulent diffusion in mine ventilation airways. J Coal Sci Eng China 14, 523–529 (2008). https://doi.org/10.1007/s12404-008-0401-x
Published:
Issue Date:
DOI: https://doi.org/10.1007/s12404-008-0401-x