Journal ArticleDOI
Multiphase Flow-Enhanced Corrosion Mechanisms in Horizontal Pipelines
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In this paper, mass transfer measurements under multiphase slug and annular flows using the limiting current density technique were carried out in a 10-cm-dia pipe using a 001-M potassium ferro/ferricyanide solution in 13 N sodium hydroxide for the liquid phase and nitrogen in the gas phase.Abstract:
Previous work has demonstrated the mechanism of enhanced corrosion in slug flow due to entrained pulses of gas bubbles (Gopal et al, 1997) Corrosion rate measurements have been made at pressures up to 079 MPa and temperatures up to 90°C, and it has been shown that the effect of these pulses of bubbles increases with pressure and Froude number This paper describes mass transfer measurements under multiphase slug and annular flows using the limiting current density technique The experiments are carried out in a 10-cm-dia pipe using a 001-M potassium ferro/ferricyanide solution in 13 N sodium hydroxide for the liquid phase and nitrogen in the gas phase Froude numbers of 4, 6, and 9 in slug flow have been studied, while gas velocities up to 10 m/s are investigated in annular flows The results show instantaneous peaks in the mass transfer rates corresponding to the pulses of bubbles in slug flow Instantaneous increases of 10–100 times the average values in multiphase flow are seen Peaks are also seen in instantaneous mass transfer rates in some annular flowsread more
Citations
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Journal ArticleDOI
EIS measurement for corrosion monitoring under multiphase flow conditions
Y Chen,W.P Jepson +1 more
TL;DR: In this paper, the electrochemical behavior of carbon steel in ASTM saltwater saturated with carbon dioxide (CO2) with/without an imidazoline based inhibitor under different flow conditions was studied using Electrochemical Impedance Spectroscopy (EIS).
Journal Article
Comparison Of Ecn And Eis Measurement For Corrosion Monitoring Under Multiphase Flow Conditions
TL;DR: In this paper, Electrochemical Noise (ECN) and Electrochemical Impedance Spectroscope (EIS) measurements were made simultaneously in a 75 mm I.D., 10 m long acrylic pipeline using salt-water/carbon dioxide mixtures.
Journal ArticleDOI
Corrosion behavior of oil tube steels under conditions of multiphase flow saturated with super-critical carbon dioxide
TL;DR: In this article, a 34.4MPa rotary autoclave was used to evaluate the corrosion behavior of J55, N80 and P110 pipe steels under the conditions of multiphase flow saturated supercritical carbon dioxide (SC-CO 2 ).
Journal ArticleDOI
Investigation into the evolution of corrosion product layer (CPL) of 1018 C-steel exposed to multiphase environment using FIB and EIS techniques
TL;DR: In this paper, focused ion beam technique was used to measure the thickness of the corrosion product layer (CPL), in contrast to the conventional techniques used to observe the cross-section of specimens.
Journal ArticleDOI
An investigation on near wall transport characteristics in an adiabatic upward gas–liquid two-phase slug flow
Donghong Zheng,Defu Che +1 more
TL;DR: Based on the hydrodynamic characteristics of an upward slug unit, the near wall transport characteristics, including mass transfer coefficient and wall shear stress, which have a great effect on gas-liquid two-phase flow induced internal corrosion of low alloy pipelines in vertical upward oil and gas mixing transport, have been both mechanistically and experimentally investigated.
References
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Proceedings ArticleDOI
Slug Flow Characteristics and Their Effect on Corrosion Rates in Horizontal Oil and Gas Pipelines
Jyi-Yu Sun,W.P. Jepson +1 more
TL;DR: In this paper, the wall shear stress and turbulent intensity at seven different axial and three circumferential locations were measured using flush mounted TSI hot f1lm anemometer probes.
Journal ArticleDOI
Development of digital image analysis techniques for the study of velocity and void profiles in slug flow
M. Gopal,W.P. Jepson +1 more
TL;DR: In this article, a nonintrusive flow visualization method for the quantitative study of the dynamic velocity and void profiles across the pipe cross section in slug flow is presented, which utilizes novel digital image analysis and computer graphics techniques.
Journal ArticleDOI
Relation of turbulent mass transfer to a wall at high Schmidt numbers to the velocity field
TL;DR: In this article, the root-mean-square fluctuating mass transfer coefficient and the frequency spectrum of the fluctuating Mass Transfer coefficient for a Schmidt number of about 2300 were measured.
Journal ArticleDOI
Fluctuations in the local rate of turbulent mass transfer to a pipe wall
Paul Van Shaw,Thomas J. Hanratty +1 more
Journal ArticleDOI
Turbulent velocity fluctuations that control mass transfer to a solid boundary
TL;DR: In this paper, the relation between velocity and concentration fields for a fully developed turbulent flow which transfers mass to a pipe wall at large Schmidt numbers has been studied, and the results provide additional support for the notion that mass transfer to a boundary at high Schmidt numbers in controlled by low frequency velocity fluctuations which contain only a small fraction of the total turbulent energy.
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