Correlations predicting frictional pressure drop and liquid holdup during horizontal gas-liquid pipe flow with a small liquid holdup |
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Authors: | J Hart PJ Hamersma JMH Fortuin |
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Institution: | Laboratorium voor Chemische Technologie, Universiteit van Amsterdam, Nicuwe Achtergracht 166, 1018 WV, Amsterdam, The Netherlands |
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Abstract: | Experimental data and correlations available in the literature for the liquid holdup εL and the pressure gradient ΔPTP/L for gas-liquid pipe flow, generally, do not cover the domain 0 < εL < 0.06. Reliable pressure-drop correlations for this holdup range are important for calculating flow rates of natural gas, containing traces of condensate. In the present paper attention is focused on reliable measurements of εL and ΔPTPIL values and on the development of a phenomenological model for the liquid-holdup range 0 < εL < 0.06. This model is called the “apparent rough surface” model and is referred to as the ARS model. The experimental results presented in this paper refer to air-water and air-water + ethyleneglycol systems with varying transport properties in horizontal straight smooth glass tubes under steady-state conditions. The holdup and pressure gradient values predicted with the ARS model agree satisfactorily with both our experimental results and data obtained from the literature referring to small liquid-holdup values 0 < εL < 0.06. Further, it has been shown that in the domain 38 < < 72 mPa m the interfacial tension of the gas-liquid system has no significant effect on the liquid holdup. The pressure gradient, however, increases slightly with decreasing surface tension values. |
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Keywords: | gas-liquid pipe flow liquid holdup pressure drop small liquid holdup stratified-wavy flow regime annular flow |
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