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An Impedance Cross Correlation (ICC) device for measuring solids velocity and volume fraction profiles in solids-water flows

Al-Hinai, Sulaiyam and Lucas, Gary (2009) An Impedance Cross Correlation (ICC) device for measuring solids velocity and volume fraction profiles in solids-water flows. In: What, Where, When: Multi-dimensional Advances for Industrial Process Monitoring International Symposium, Tuesday 23 - Wednesday 24 June 2009, Leeds, UK. (Unpublished)

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    Abstract

    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 paper 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 o 30 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 dual-plane electrical resistance tomography
    (ERT).

    Item Type: Conference or Workshop Item (Paper)
    Additional Information: Permission given "as long as it is for internal purpose of the university"
    Subjects: T Technology > TP Chemical technology
    T Technology > TJ Mechanical engineering and machinery
    T Technology > TA Engineering (General). Civil engineering (General)
    Schools: School of Computing and Engineering
    School of Computing and Engineering > High Performance Computing Research Group
    School of Computing and Engineering > Systems Engineering Research Group
    Related URLs:
    Depositing User: Sara Taylor
    Date Deposited: 06 Aug 2009 16:53
    Last Modified: 14 Sep 2011 12:04
    URI: http://eprints.hud.ac.uk/id/eprint/5372

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