Gorobei M.S. Theoretical research of dynamics of dust flows in underground workings and de-velopment of a physical model for interaction between dispersed liquids and carbon-containing dustsuspended in the air
- Details
- Parent Category: Geo-Technical Mechanics, 2018
- Category: Collection of scientific papers «Geotekhnicheskaya Mekhanika» Issue 141
Geoteh. meh. 2018, 141, 184-189
https://doi.org/10.15407/geotm2018.141.184
THEORETICAL RESEARCH OF DYNAMICS OF DUST FLOWS IN UNDERGROUND WORKINGS AND DEVELOPMENT OF A PHYSICAL MODEL FOR INTERACTION BETWEEN DISPERSED LIQUIDS AND CARBON-CONTAINING DUSTSUSPENDED IN THE AIR
1Gorobei M.S.
1State Environmental Academy of Postgraduate Education and Management
UDC 504.054:622.807.2
Language: Ukrainian
Annotation.
The environmental risk of carbon-containing dust emissions necessitates undertaking measures for dedusting the mine ventilation air streams and reducing dust emissions to the atmosphere. An analysis of the reviewed professional literature sources has shown that today, there is no theoretical works covering mechanism of capturing suspended carbon-containing dust by the dispersed water jets. There is also no physical model of this process. Research of mechanism of capturing carbon-containing dust suspended in air and dispersed liquid in the ventilation flow is an important scientific and practical task, which can not be solved without considering dynamics of dust and dispersed water flows. Taking the known theoretical and experimental data on interaction between dispersed liquid and carbon-containing dust suspended in air as a bsse, mechanism for capturing suspended coal dust by liquid droplets in the ventilation stream is now undaerstood more exactly: dust particles do not have to be wetted and immersed in a droplet liquid, for example, in case of natural and forced charge of dust and dispersed water flows. Having occurred in the area uinder the effect of electrostatic forces, particles move to dropletss until falling on the roadway soil and before being coagulated. When the particles of carbon-containing dust get the wet soil, effect of the ventilation flow dedustinf starts. It is proved that motion of dust particles and liquid droplets passes from the turbulent regime to the laminar one and partially captures the transition regime. Therefore, consideration of laminar regime only by the Stokes law, as it is in the works of predecessors, can lead to gross errors. Researchs have shown that the Stokes law can be used for estimating vertical speed of motion only in case of particle or droplet diameters smaller than 200 microns. Moreover, one cannot use the Stokes law for the longitudinal velocity in the core of the torch, where the local Reynolds numbers can amount several thousand. The results obtained allow revealling mechanism of interaction between the atomized liquid and coal dust and can be used in designing of new effective means for removing suppression carbon-containing dust.
Keywords:
carbon dust, dust suppression, dispersed water flows, laminar regime, turbulent regime
References
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https://doi.org/10.15407/mining09.04.443
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About the author
Gorobeі Maryna Serhiivna, Master of Science, Senior Researcher at Scientific Park Chornobyl State Institution State Environmental Academy of Postgraduate Education and Management, Kyiv, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.