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Thread: Air Intake Quantity for efficient conveying in Vacuum Pneumatic Conveyor

  1. Air Intake Quantity for efficient conveying in Vacuum Pneumatic Conveyor

    Dear Sirs/Madams

    I need information about the correct (optimum) quantity of Air at the intake of Vacuum Pneumatic Conveying Systems and the methods (design) for such.

    Also do the Intake Nozzles have to be placed at an low angle (inclined). What would be correct design of such intake nozzles ?

    Would be glad to recieve your comments and feedback in this regard.
    My Email ID is

    Thanking you in advance...

    Best Regards
    Shrinivas Deshpande

  2. #2
    Author Guest
    Dear Mr. Deshpande,

    Thanks for your mail. My paper on Pneumatic Conveying Drying was published
    quite early .

    Chand, P. (1973) "A theoretical model of the pneumatic conveying- drying
    system", Proc. 2nd Int. Conf. on the pneumatic transport of solids in pipes,
    BHRA, Guildford,England,pp C2-15 - C2-27

    But I consider still the right way to proceed for that kind of problem. My
    recent work- expected to be presented at Montreal on 18th July ( ASME
    Forum ) is in fact an extension of this work.

    Regarding your other problem- feeding material into the piping, I think you
    must be having a metering device in the form of a well designed Star Feeder
    / Nozzle/ Screw Feeder at the intake to have smooth flow of material.


    Dr. Prem Chand

  3. #3
    Air intake quantity must be such that it results in the required pick-up velocity at the solids' feed point. In vacuum systems, this means that the vacuum blower must be sized for providing this velocity.

    The orientation of air intake whether inclined or horizontal does not have much effect on the pick-up velocity. This is because the resulting pressure drop is very low.


    Amrit Agarwal (Tim)
    Pneumatic Conveying Consultants

  4. If I have understood your question correctly, you are referring to the use of inclined pick-up nozzles to entrain the material into the conveying line? If this is indeed the case, then there will be a marked drop off in entrainment performance as the nozzle moves away from the vertical. The design of the inner/outer tube relationship will also be critical in obtaining the required feedrate into the system.

    If you e-mail me your full postal contact details, I will put some technical papers that have resulted from our research on this topic in the mail to you.


    Richard Farnish
    Consulting Engineer

    The Wolfson Centre for Bulk Solids Handling Technology
    University of Greenwich, London


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