Experimental characterization of boiling two-phase flow structures under BWR core operating conditions

Abstract Liquid-assisted gas-lift (LAGL) is a recently developed concept to unload wells using a gas–liquid fluid mixture. The success deployment of the LAGL technology is related to the behavior of two-phase flow through gas-lift valves. For this reason, this work presents an experimental and numerical study on two-phase flow through orifice gas-lift valves used in liquid-assisted gas-lift unloading. To the knowledge of the authors, there is no investigation in the literature on experimental characterization of two-phase flow through gas-lift valves. Experimental data are presented for methane-water flow through gas-lift valves with different orifice port sizes: 12.7 and 17.5 mm. The experiments were performed for pressures ranging from 1.00 to 9.00 MPa, gas flow rates from 0 to 4.71 m3/h, and water flow rate from 0 to 0.68 m3/min. The experimental results are compared to numerical models published in the literature for two-phase flow through restrictions and to commercial multiphase flow simulators. It is observed that some models developed for two-phase flow through restrictions could successfully characterize two-phase flow thorough gas-lift valves with errors lower than 10%. However, it is first necessary to experimentally determine the discharge coefficient (CD) for each gas-lift valve. The commercial flow simulators showed a similar performance as the models available in the literature.

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Experimental characterization of two-phase flow patterns in a slit microchannel

Experimental Thermal and Fluid Science ◽

10.1016/j.expthermflusci.2019.01.022 ◽

2019 ◽

Vol 103 ◽

pp. 262-273 ◽

Cited By ~ 7

Author(s):

Fedor Ronshin ◽

Evgeny Chinnov

Keyword(s):

Two Phase Flow ◽

Flow Patterns ◽

Phase Flow ◽

Experimental Characterization ◽

Two Phase

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Characterization of the Non-Reacting Two-Phase Flow Downstream of an Aero-Engine Combustor Dome Operating at Realistic Conditions

Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations ◽

10.1115/94-gt-263 ◽

1994 ◽

Cited By ~ 6

Author(s):

Vincent G. McDonell ◽

Jason E. Seay ◽

Scott Samuelsen

Keyword(s):

Two Phase Flow ◽

General Structure ◽

Basic Structure ◽

Operating Conditions ◽

Inlet Temperature ◽

Phase Flow ◽

Two Phase ◽

Temperature Changes ◽

Phase Doppler Interferometry

The structure of the two-phase flow produced by a SNECMA/GEAE CFM-56 swirl cup is characterized using flow visualization and phase Doppler interferometry. Three operating conditions are examined, corresponding to 3.5, 7, and 15% power levels for the engine. Detailed measurements are obtained for the 3.5 and 7% power conditions. The results obtained are contrasted to previous results obtained in an idealized environment with the goal of assessing the relevance of such data to practical conditions. The results reveal that the increase in power has little impact upon the general structure of the flow and that even the atmospheric results provide the basic structure associated with the actual conditions. This is attributed to the similarity in pressure drop for each of the cases considered. Increasing power does lead to a systematic reduction in drop size despite exceeding crossover points for the duplex atomizer used. This difference is attributed primarily to inlet temperature changes.

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