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What significance does brownian motion has to do with coal explosion?

  1. Apr 12, 2013 #1
    Apparently :

    What significance does brownian motion has to do with coal explosion?[Brownian motion or pedesis is the presumably random moving of particles suspended in a fluid (a liquid or a gas) resulting from their bombardment by the fast-moving atoms or molecules in the gas or liquid.]

    Now I wish to know if This movement has anything to do with gas explosion?(Underground mining)
    And does this motion happens under pressure in a coal seam?...briefly:

    does gas show same property underground?(pressure,fluid,heat)And what techniques could speed it up?

    Cheers,
    SON
     
    Last edited: Apr 12, 2013
  2. jcsd
  3. Apr 12, 2013 #2

    CWatters

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    Brownian motion is a small scale effect, typically you need a microscope to observe it. I suspect movement of coal dust is likely to be dominated by larger scale effects such as ventilation or convestion?
     
  4. Apr 12, 2013 #3
    http://en.wikipedia.org/wiki/Coal_dust_explosion

    has some interesting discussion but no mention of Brownian motion....

     
  5. Apr 13, 2013 #4

    Thanks
    Just wondering how small?(in scale) with coal seam under hydrostatic pressure what could be changed ?imagine a 10 meters thickness of coal (in a range of 10 kilometers) 400 meters under surface, what could we expect to see when many things ,including hydrostatic pressure changes ?and gas(ch4)starts to flow?

    Cheers
     
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