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Modeling of a homogenous gas-water two phase flow through a Venturi and vertical pipe (A prediction of pressure drop sign change in two phase flow)

Hasan, Abbas and Lucas, Gary (2007) Modeling of a homogenous gas-water two phase flow through a Venturi and vertical pipe (A prediction of pressure drop sign change in two phase flow). In: Proceedings of Computing and Engineering Annual Researchers' Conference 2007: CEARC’07. University of Huddersfield, Huddersfield, pp. 1-6.

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    Abstract

    In two phase flow, differential pressures technique can be used to measure the volume fraction of the gas phase. In the
    case where no restriction is available in the pipeline, the differential pressure technique can be used only in vertical or
    inclined pipelines. Two phase air-water pressure drop across a Venturi meter may change its sign from positive to negative
    due to change in the compressibility of the gas phase. In other words, the inlet of the venturi (upstream section) is not
    always positive as in a single phase flow. A new model to predict the sign change of the two phase pressure drop across a
    Venturi was developed and checked against data recently obtained from an air-water flow rig at the University of
    Huddersfield. The predication of a two phase pressure drop through a vertical pipe was also investigated and compared with
    experimental data. Four sets of data were investigated. In each set the water volumetric flow rate was fixed while the gas
    volumetric flow rate was varied (see table-1). It was inferred from the model proposed in this paper and the experimental
    data that the sign of the differential pressure drop across Venturi meter and parallel pipe for homogenous air-water flow
    depends mainly on the parameters C1, C2, Uh and K. Therefore, if C1 > C2 then, the differential pressure drop across Venturi
    tends to be negative and if Uh
    2 > K then the differential pressure drop across a 1m long Perspex pipe will be negative.

    Item Type: Book Chapter
    Uncontrolled Keywords: pressure drop, Venturi meter, Bernoulli’s equation, friction factor, homogenous flow
    Subjects: T Technology > T Technology (General)
    T Technology > TA Engineering (General). Civil engineering (General)
    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 09:37
    Last Modified: 16 Dec 2010 09:31
    URI: http://eprints.hud.ac.uk/id/eprint/3787

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