Uncertainty analysis for multiphase flow: a case study for horizontal air-water flow experiments.

Abstract:

This work describes the procedure used to define the measurements uncertainties of experiments in horizontal air-water two-phase flow performed in order to identify influences due to pipe diameter. These experiments were performed with 4 different pipe diameters, always using the same test section length, therefore varying the length-by-diameter (L/D) ratio. Several parameters were measured, such as fluid flow, pressure, temperature and pressure drop; other parameters were calculated, such as the superficial velocities of each fluid, as well as their respective properties. The main parameters studied were the flow patterns for different velocity configurations and the two-phase pressure drop to be used for model improvement, thus the importance of uncertainties analysis. The sources of uncertainty were defined, detailed, systematically studied and quantified. The flow maps with its uncertainties could show the regions a pattern can be defined, and the plots of two-phase pressure drop variation with diameter validated the homogeneous model as a good approach to calculate pressure drop.


Reference:
SILVA, Felipe Jaloretto; CASTRO, Marcelo Souza de. Uncertainty analysis for multiphase flow: a case study for horizontal air-water flow experiments. In: INTERNATIONAL FLOW MEASUREMENT CONFERENCE, FLOMEKO, 18., Lisboa, 2019. Proceedings… 7 p.

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