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Application of a Pair of Conical Narrowing Devices to Define Flow Rates of Horizontal Two-Phase Water-Gas Flows in Separationless Flow-Meter

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Abstract

The article offers two methods to find mass flow rates of two-phase water-air flows by means of conical narrowing devices (ND) that is a particular operation case of a three-phase flowmeter oil-water-gas based on a dual-isotope gamma-densitometer and ND. One of the methods considers pressure losses due to friction and a possible crisis of hydraulic resistance in the ND, revealed in [2, 3]. This method is based on a model in which the void fraction φ is defined using the proposed approach to find the averaged slip ratio values in the ND. The peculiarity of the other method is the substantiated possibility to use a quasi-homogeneous model. In this case, the relationship of flow rates, pressure drops across the ND, thermophysical properties of components, volumetric gas contents β and friction factors is considered. Influence of a geometric parameter for the pair of the conical ND with diameters of 98/70 mm and 70/50 mm, is analyzed on the basis of the experimental data and calculation technique. For the real flow-meter with the nominal diameter DN 100, it is recommended to use the ND with diameters of 70/50 mm, and the relationship between the values of φ and β, φ = Cβ , C < 1, is justified for this ND. The experimental data were obtained at the State standard of multiphase flows GET195-2011 in Kazan for volumetric water flow rates from 24 to 56 m3/h and volumetric gas contents from 0 to 70% at the temperature of about 20°C. The second method is preferable, and it allows one to define the flow rates of the two-phase flow with maximum relative deviations about ±2%. This is quite optimistic for the conditions under consideration. The possibility of existence or absence of the hydraulic resistance crisis in both ND is discussed.

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Authors and Affiliations

  1. National Research University Moscow Power Engineering Institute, 111250, Moscow, Russia

    A. Yu. Filippov

  2. Joint Institute for Nuclear Research, 141980, Dubna, Russia

    Yu. P. Filippov

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  1. A. Yu. Filippov
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  2. Yu. P. Filippov
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Correspondence to A. Yu. Filippov or Yu. P. Filippov.

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Filippov, A.Y., Filippov, Y.P. Application of a Pair of Conical Narrowing Devices to Define Flow Rates of Horizontal Two-Phase Water-Gas Flows in Separationless Flow-Meter. Therm. Eng. 69, 326–335 (2022). https://doi.org/10.1134/S0040601522050019

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