• Login
    View Item 
    •   DSpace@RPI Home
    • Rensselaer Libraries
    • RPI Theses Online (Complete)
    • View Item
    •   DSpace@RPI Home
    • Rensselaer Libraries
    • RPI Theses Online (Complete)
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Pressure drops in the pneumatic conveyance of solids by gases

    Author
    Pinkus, Oscar
    View/Open
    179263_thesis.pdf (12.15Mb)
    Other Contributors
    Date Issued
    1951-06
    Subject
    Mechanical engineering
    Degree
    MS;
    Terms of Use
    This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.;
    Metadata
    Show full item record
    URI
    https://hdl.handle.net/20.500.13015/2271
    Abstract
    It was found that the presence of the solid phase causes an appreciable pressure loss in the pipe. This pressure loss is a linear function of both, solid and gas flow rate. This justified the theoretical equations which predicted such a relationship.; Recommendations for further investigation are made.; Following results of this work it would seem desirable to operate pneumatic systems at low gas velocities and high solid rates. However upper and lower limits were found to exist in such an attempt. At very low solids rates instability sets in followed by strong pressure surges. At high solids rates a settling tendency was observed with nonuniformity in the flow; On the basis of this investigation it is concluded that the drag coefficient C is a function of Reynolds number and is independent of the behavior of the fluid. The ratio of solids velocity to the a velocity is 0.5 - 0.6 for the small sand and 0.3 for the large sand.; Experiments vd.th the two sizes of sand showed a higher pressure drop for the larger particles, other conditions being equal. The solids velocity was lower for the larger diameter. These experiments, however, question the validity of using the Fanning equation in its application to a solid phase. The equation holds for a given solid but does not take into account variations in its size. The introduction of the dimensionless group d/D is proposed; With the object of studying the characteristics of the horizontal flow of a mixture of solids and air a theoretical analysis of the flow pattern was attempted. Experiments were performed whose object was, first, to deter.mine the relationship between pressure loss, solids flow rate and air velocity, and secondly to obtain values for frictional constants involved in the analysis. A justification for the developed equations was sought.; A limitation in this work was the inability to measure directly the solids velocity. Equations were developed for this purpose. Two sizes of the same kind of sand were used.;
    Description
    June 1951; School of Engineering
    Department
    Dept. of Mechanical Engineering;
    Publisher
    Rensselaer Polytechnic Institute, Troy, NY
    Relationships
    Rensselaer Theses and Dissertations Online Collection;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
    Collections
    • RPI Theses Online (Complete)

    Browse

    All of DSpace@RPICommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    Login

    DSpace software copyright © 2002-2022  DuraSpace
    Contact Us | Send Feedback
    DSpace Express is a service operated by 
    Atmire NV