Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Two-phase virtual flow rate meter: experimental evaluation under intermittent flow
Submission Author:
Sergio de Paula Pellegrini , SP
Co-Authors:
Sergio de Paula Pellegrini, Aluisio do Nascimento Wrasse, Marco Jose Da Silva, Jorge Luis Baliño
Presenter: Sergio de Paula Pellegrini
doi://10.26678/ABCM.ENCIT2020.CIT20-0123
Abstract
Different calibration formulas exist for two-phase flow rate measurement with a Venturi tube. Although these can provide good results for wet gas, their extension to other flow conditions is not obvious. The current work analyzes the accuracy of a virtual flow meter strategy on intermittent flow. This metering framework is derived from one-dimensional analysis of incompressible flow with constant slip in the Venturi tube and uses Chisholm correlation for slip. The analysis is performed with experimental data for air-water flow with Lockhart-Martinelli parameter varying between 0.6 and 2370, corresponding mostly to slug flow. It results that the total mass flow rate is predicted with a root-mean-square deviation of 2.65% and 2.77% for flows in 1” and 2” pipes, respectively, denoting good accuracy. This is a great improvement as compared to the homogeneous model, with equivalent deviations of 12.75% and 12.09%. The applicability of virtual metering techniques is limited, as a precise measurement of mass quality (after separation) is required. Nevertheless, the current results encourage the use of this calibration formula for real two-phase flow rate measurement.
Keywords
Virtual flow rate meter, Two-phase Flow, Venturi, Intermittent flow
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