Title: TWO-PHASE ANNULAR FLOW IN A VERTICALLY MOUNTED VENTURI FLOW METER
Abstract:In the present research work, the experimental inve stigation of a vertical upward annular two-phase flow in a Ventu ri Flow Meter (VFM) is performed. The pressure drops between the inlet and throat s...In the present research work, the experimental inve stigation of a vertical upward annular two-phase flow in a Ventu ri Flow Meter (VFM) is performed. The pressure drops between the inlet and throat section and between inlet and outl et (irreversible pressure drops) are measured and anal yzed. The flow meter is characterized by an inlet diamete r of 80 mm and a throat diameter of 40 mm ( β=0.5), with equal convergent and divergent angles (θ=21°). The instrument has been tested in a test section, having an internal diameter ( Di) of 80 mm and a total length ( L) of about 4 m, with air-water two-phase flow at ambient pressure. The air superficial velocity rang ed between 14 and 18 m/s while the water superficial velocity ranged between 0.0008 and 0.005 m/s, so that the flow patt ern was annular and the corresponding void fraction was hig her than 0.97, while the flow quality ranged between 0.78 an d 0.96. The dependency of the pressure drops on the phases velocities has been analyzed and modeled as a function of the superficial velocities of the phases. In addition the possibility to derive the mass flow rate of the two-phases from the sensor signals, when the flow p attern does not change, has been analyzed. The developed model allows the evaluation of the flow quality of the mixture with an accuracy of 5% and the estimation of the mass flow rate of a ir and water with an accuracy of 2% and 30% respectively.Read More
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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