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    Investigation of granular impact using positron emission particle tracking

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    Type
    Article
    Authors
    Marston, Jeremy O.
    Thoroddsen, Sigurdur T cc
    KAUST Department
    High-Speed Fluids Imaging Laboratory
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    KAUST Grant Number
    7000000024
    Date
    2015-04
    Permanent link to this record
    http://hdl.handle.net/10754/564117
    
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    Abstract
    We present results from an experimental study of granular impact using a combination of high-speed video and positron emission particle tracking (PEPT). The PEPT technique exploits the annihilation of photons from positron decay to determine the position of tracer particles either inside a small granular bed or attached to the object which impacts the bed. We use dense spheres as impactors and the granular beds are comprised of glass beads which are fluidised to achieve a range of different initial packing states. For the first time, we have simultaneously investigated both the trajectory of the sphere, the motion of particles in a 3-D granular bed and particles which jump into the resultant jet, which arises from the collapse of the cavity formed by the impacting sphere.
    Sponsors
    This work was partially supported by an Academic Excellence Alliance grant awarded by the KAUST Office of Competitive Research Funds number 7000000024. The experimental work was conducted whilst J.O.M. was on a research visit to the University of Birmingham. The authors thank Andy Ingram for the assistance and advice with the experimental setup, and Thomas Leadbeater, Joseph Gargiuli and Dave Parker for assisting with the experiments and analysis.
    Publisher
    Elsevier BV
    Journal
    Powder Technology
    DOI
    10.1016/j.powtec.2015.01.033
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.powtec.2015.01.033
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program

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