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Makeev Scientific Research Institute. Translated from Fiziko-tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No.
5, pp. 90–92, September–October, 1990. 相似文献
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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.
Supported by the National Natural Science Foundation of China(50375026) 相似文献
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N. M. Koryakin 《Journal of Mining Science》1989,25(6):583-586
Militarized Mine Rescue Unit, Sverdlovsk. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh,
No. 6, pp. 98–102, November–December, 1989. 相似文献
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V. B. Popov 《Journal of Mining Science》1990,26(6):553-556
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T. P. Stefanov 《Journal of Mining Science》1988,24(4):376-384
Sofia, Bulgaria. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 101–110, July–August,
1988. 相似文献