A model for a gas-polydispersed particle flow in a pipeline is presented. The chaotically moving particles of different sizes are represented as sets of granular gases having different granular temperatures. The latter are generated due to partial momentum loss of particle-wall collisions as well as due to collisions of particles of different sizes with each other, and dissipated because of partially inelastic particle-particle collisions and also due to the particle-gas viscous friction. The model developed has been validated by comparison of the calculated pressure losses with the experimental data. The granular temperatures calculated by the model have been compared to those computed by the molecular dynamics code. A comparison is also made on the effect of polydispersity on pressure losses. An engineering model for the polydispersed gas-solids flows in a pipeline was developed. The model was validated against experimental data for pressure losses as well as against pressure gradients and granular temperature calculated using a numerical code for a discrete system. The analysis showed that the model developed can be used for engineering calculations. The numerical study of polydispersed gas-particle flows in different flow regimes was also performed. It showed the impact of solids polydispersity on flow parameters is significant and should be taken into account in engineering calculations. The strongest effect of flow polydispersity is revealed along a section of the flow acceleration where the granular temperature generation due to collisions of collisions of particles of different sizes with each other exceeds the generation caused by particle collisions with the wall.


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    Title :

    An engineering model of dilute polydisperse pneumatic conveying


    Additional title:

    Ein Konstruktionsmodell einer verdünnten, polydispersen, pneumatischen Förderung


    Contributors:
    Eskin, D. (author) / Leonenko, Y. (author) / Vinogradov, O. (author)

    Published in:

    Publication date :

    2007


    Size :

    10 Seiten, 9 Bilder, 1 Tabelle, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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