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Sensitivity analysis for a 4-sensor probe used for bubble velocity vector measurement

Pradhan, Suman, Lucas, Gary and Panayotopoulos, Nikolaos (2006) Sensitivity analysis for a 4-sensor probe used for bubble velocity vector measurement. In: Proceedings of Computing and Engineering Annual Researchers' Conference 2006: CEARC’06. University of Huddersfield, Huddersfield, pp. 1-6.

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    Abstract

    In recent years, there has been an increase in the level of interest shown in making flow rate
    measurements in multiphase flow. This in part has been brought about by the metering requirements
    of the oil and natural gas industries. Measuring the volumetric flow rate of each of the flowing
    components is often required and this is particularly true in production logging applications, where it
    may be necessary to measure the flow rates of oil and water down hole in vertical and inclined oil
    wells. Within the University of Huddersfield [1], work has been undertaken on the study of vertical and
    inclined multiphase flow. Previous work was based on the use of local, dual-sensor conductance
    probes to obtain the local axial velocity and volume fraction of the bubbles in multiphase flows [1]. The
    purpose of this research presented in this paper is to investigate the sensitivity of 4-sensor-probes,
    used for bubble velocity vector measurement to dimensional measurement errors of the probe and to
    errors in measuring the time intervals between the surfaces of the bubble contacting the sensors in the
    probe.

    The probe was manufactured from 0.3mm diameter stainless steel acupuncture needles due to their
    high level of rigidity. The acupuncture needles were mounted inside a stainless steel tube with an
    outer diameter of 4mm [2]. A procedure was carried out whereby an error on a specific probe
    dimension was introduced (errors in the range of -10 % to +10% of the true value of the dimension
    were used). The error in the measured bubble velocity vector was then investigated. A similar
    procedure was used to investigate the effect of measurement errors in the probe ‘time intervals’δt11 ,
    22 δt and 33 δt on the measured bubble velocity vector. NB:The bubble velocity vector is quantified in
    terms of a polar angle α an azimuthal angle β and a velocity magnitude v .
    Results demonstrate that it is crucial to measure probe dimensions precisely (within the range of ±1%)
    as small errors in the probe dimensions or measured time intervals can give rise to large errors in the
    values ofα , β and v .

    Item Type: Book Chapter
    Subjects: Q Science > Q Science (General)
    T Technology > T Technology (General)
    Q Science > QC Physics
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Computing and Engineering Annual Researchers' Conference (CEARC)
    School of Computing and Engineering > Systems Engineering Research Group
    School of Computing and Engineering > High Performance Computing Research Group
    Related URLs:
    Depositing User: Graham Stone
    Date Deposited: 03 Apr 2009 12:08
    Last Modified: 16 Dec 2010 09:34
    URI: http://eprints.hud.ac.uk/id/eprint/3806

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