Soviet Mining

, Volume 5, Issue 5, pp 552–556 | Cite as

Controlling ventilation currents to prevent layered methane accumulations in mines

  • K. Z. Ushakov
  • L. A. Puchkov
  • G. I. Chizhikov
Mine Aerodynamics
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Conclusions

  1. 1.

    The authors have studied the shaping effect of grids on the velocity field and turbulent characteristics of air streams in mine workings.

     
  2. 2.

    The dependence of the diffusion coefficient of methane in an air stream on the distance to the grid in the case of complete coverage of the roadway cross section has been established. The degree of the effect of the increase of the diffusion coefficient in the area immediately beneath the roof, with partial coverage of the roadway cross section by a grid, has been determined.

     
  3. 3.

    The effectiveness of reducing the concentration of layered methane accumulations by shaping the air steam parameters by grids has been determined in mines. It has been established that the use of a single grid with a mesh size of 0.5–1 mm enables us to reduce greatly the methane concentration beneath the roof at a distance of up to 20–25 roadway diameters.

     

Keywords

Diffusion Coefficient Methane Concentration Mine Working Complete Coverage Pulsation Velocity 

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Literature Cited

  1. 1.
    K. Z. Ushakov, “A dynamic method of calculating the ventilation of collieries,” in: Technology of Underground Mining of Coal [in Russian], No. 2, Nedra, Moscow (1967).Google Scholar
  2. 2.
    Pai Shih-i, Turbulent Flow of Liquids and Gases [Russian translation], IL, Moscow (1962).Google Scholar
  3. 3.
    A. I. Ksenofontova and K. Z. Ushakov, “Turbulent characteristics of air streams in mine roadways,” Izv. Vuzov. Gorn. Zh., No. 4 (1966).Google Scholar
  4. 4.
    D. K. Batchelor, Theory of Homogeneous Turbulence [Russian translation], IL, Moscow (1955).Google Scholar
  5. 5.
    W. L. Towl and T. K. Sherwood. “Mass transfer in the central portion of a turbulent air stream,”Ind. and Eng. Chem.,31, No. 4 (1939).Google Scholar

Copyright information

© Consultants Bureau 1970

Authors and Affiliations

  • K. Z. Ushakov
  • L. A. Puchkov
  • G. I. Chizhikov

There are no affiliations available

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