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Thread: Conveying of Moist powders & water droplets

  1. #1
    doctorsundar Guest

    Conveying of Moist powders & water droplets

    Glad I discovered this forum. We build a grinder that also dries, without any heat input. From the grinding chamber, the powder is conveyed to a cyclone through a 3 meter long inclined and curved 0.4 m diameter duct. We pulverize and dry wood chips (hog fuel) among other things. The moisture content may reduce from 20 % wb to 10 % wb while being ground. (wb stands for wet basis).

    What formula would I use to estimate the carrying velocity needed? I have seen a few formulas but they all require the density of a PARTICLE of wood.

    1. How would I measure that density? Are there any formulas that use bulk density instead? Or is there a way to relate bulk density to the density of a particle?

    2. How will the carrying velocity change as a function of the moisture content of the wood powder?

    Thanks.

    Sundar Narayan

  2. #2
    Mark Kilfoil Guest
    Greetings

    1. Surely the density of a wood particle equals the density of solid wood, at the correct moisture content ?

    2. The influence of moisture content is through its effect on particle density.

    Hope this helps.

    Regards
    Mark Kilfoil

    Mechancial Engineering
    Technikon Witwatersrand
    Phone + 27 11 406 2300
    E-mail : mkilfoil@mail.twr.ac.za

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