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An Impedance Cross Correlation (ICC) Device For Measuring Solids Velocity And Volume Fraction Profiles In Solid-Water Flows

Al-Hinai, Sulaiyam and Lucas, Gary (2009) An Impedance Cross Correlation (ICC) Device For Measuring Solids Velocity And Volume Fraction Profiles In Solid-Water Flows. In: University of Huddersfield Research Festival, 23rd March - 2nd April 2009, University of Huddersfield. (Unpublished)

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    Multiphase flow is the simultaneous flow of two or more
    phases, in direct contact, in a given system. It is important
    in many fields of chemical and process engineering and in
    the oil industry, e.g. in production wells and in sub-sea
    pipelines. The behavior of the flow will depend on the
    properties of the constituents, the flows and the geometry
    of the system.
    Upward inclined solids-liquid flows are sometimes
    encountered in the process industries for example in water
    treatment processes and in oil well drilling operations.
    Measurements of the local solids volume fraction
    distribution and the local axial solid velocity distribution
    are important, for example, in measuring the solids
    volumetric flow rate.
    This study presents a non-intrusive Impedance Cross-
    Correlation (ICC) device to measure the local solids volume
    fraction distribution and the local axial solids velocity
    distribution in upward inclined solids-water flows in which
    these distributions are highly non-uniform.
    The ICC device comprises a non-conductive pipe section of
    80mm internal diameter fitted with two arrays of electrodes
    at planes, A and B, separated by an axial distance of
    50mm. At each plane, eight electrodes are equispaced over
    the internal circumference of the pipe. A control system
    consisting of a microcontroller and analogue switches is
    used such that, for planes A and B, any of the eight
    electrodes can be configured as an ‘excitation electrode’
    (V+), a ‘virtual earth measurement electrode’ (ve) or an
    ‘earth electrode’ (E) so that different regions of the flow
    cross section can be interrogated. Conductance signals
    from planes A and B are then cross correlated to yield the
    solids velocity in the region of flow under interrogation.
    Experiments were carried out in water-solids flows in a flow
    loop with an 80 mm inner diameter, 1.68m long Perspex
    test section which was inclined at 30o to the vertical. The
    most significant experimental result is that, at the upper
    side of the inclined pipe, the measured solids velocity is
    positive (i.e. in the upward direction), whilst at the lower
    side of the inclined pipe the measured local axial solids
    velocity is negative (i.e. in the downward direction). This
    shows quantitative agreement with previous work carried
    out using intrusive local probes to measure the solids
    velocity profile. The study also shows qualitative agreement
    with high speed film of the flow.
    It is believed that this method of velocity profile
    measurement is much simpler to implement than dualplane
    electrical resistance tomography (ERT).

    Item Type: Conference or Workshop Item (Poster)
    Subjects: T Technology > TA Engineering (General). Civil engineering (General)
    Schools: School of Computing and Engineering
    School of Computing and Engineering > High-Performance Intelligent Computing > High Performance Computing Research Group
    School of Computing and Engineering > Systems Engineering Research Group
    Depositing User: Cherry Edmunds
    Date Deposited: 22 Jul 2009 09:47
    Last Modified: 16 Dec 2010 09:07


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