지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2013.1
- 수록면
- 183 - 189 (7page)
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초록· 키워드
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Turbulent diffusion coefficients were estimated using sulfur hexafloride (SF6) as a tracer gas in an underground limestone mine with large cross-sectional area driven by the room-and-pillar mining method. In the case of a large underground airway showing very low air velocity of ,0.1 m/s, turbulent diffusion is more influential than convective diffusion. This suggests that turbulent diffusion has to be understood prior to estimating the concentration of distribution of contaminants in the working area. SF6 concentrations were measured at a point downstream of the release point and turbulent diffusion coefficients were determined along with the average air velocity from the measured concentration profiles including multiple modes. The well-known Taylor equation was found to be inappropriate as the estimation method for turbulent diffusion coefficient in underground mines. A curve-fitting method assuming the existence of multiple modes associated with individual concentration distributions was used to estimate the diffusion coefficients. The study results show that the turbulent diffusion coefficients range from 0.01 to 1.80m2/s in the airway with large cross-sectional area of 84m2 and low velocity of ,1.0 m/s.
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