Using computational fluid dynamics in combating erosion–corrosion

Nešić, Srdjan

doi:10.1016/j.ces.2006.01.052

Cited by 20 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it should be considered a reasonable approximation rather the correct representation because our model does not feature turbulence, which is likely to be established at the out-flow region. The build-up of turbulence caused by a rapidly turning flow was shown by Nešić to result in greater degree of erosion-corrosion degradation [105].…”

Section: Validity Of the Numerical Resultsmentioning

confidence: 99%

On a multiphysics approach to modelling the erosion–enhanced corrosion of low–alloy carbon steel in chloride containing environments

2020

View full text Add to dashboard Cite

To be written at the end The effects of erosion-enhanced corrosion of low-alloys carbon steel have been studied experimentally by measuring polarization curves in an impinging jet configuration and a multiphysics algorithm has been develop to describe the erosion-corrosion interactions. The aims of the research are to improve the longevity of transporation processes for Copper mining in Chiles. In this study an electrode of API 5L X65 steel was exposed to electrolyte jet of different chloride content (0.005, 0.05 or 0.5 M NaCa) containing silica particles (250-350 m). The simulated polarization curves were obtained by adopting a coupled electrochemical-transportreaction model. The effect of erosion on the reactions was found to be well described as a proportionality factor of the electrochemical reaction' kinetics determined for the cases with, and without, the erodent. It is thought that the presence of chloride contributes mostly through increased conductivity of the electrolyte.

show abstract

Section: Validity Of the Numerical Resultsmentioning

confidence: 99%

On a multiphysics approach to modelling the erosion–enhanced corrosion of low–alloy carbon steel in chloride containing environments

2020

View full text Add to dashboard Cite

show abstract

“…It can often be assumed that corrosion is controlled by adjusting the mass transfer while erosion is under the flow of a particulate second phase. This is a credible assumption as corrosion films are brittle-like materials and therefore are eroded easily by impacting particles [ 1 , 2 ]. This phenomenon has been investigated experimentally in a number of pioneering studies; see [ 3 – 7 ], for instance.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model

Safaei

Mahian

Garoosi

et al. 2014

The Scientific World Journal

113

View full text Add to dashboard Cite

This paper addresses erosion prediction in 3-D, 90° elbow for two-phase (solid and liquid) turbulent flow with low volume fraction of copper. For a range of particle sizes from 10 nm to 100 microns and particle volume fractions from 0.00 to 0.04, the simulations were performed for the velocity range of 5–20 m/s. The 3-D governing differential equations were discretized using finite volume method. The influences of size and concentration of micro- and nanoparticles, shear forces, and turbulence on erosion behavior of fluid flow were studied. The model predictions are compared with the earlier studies and a good agreement is found. The results indicate that the erosion rate is directly dependent on particles' size and volume fraction as well as flow velocity. It has been observed that the maximum pressure has direct relationship with the particle volume fraction and velocity but has a reverse relationship with the particle diameter. It also has been noted that there is a threshold velocity as well as a threshold particle size, beyond which significant erosion effects kick in. The average friction factor is independent of the particle size and volume fraction at a given fluid velocity but increases with the increase of inlet velocities.

show abstract

“…2 (Elvery and Bremhorst, 1996). Few predictive models exist for the electrochemical processes (Nešić, 2006) thus leaving the most promising line of enquiry to be the search for flow arrangements that lead to flow angles into tubes being as near to axial as possible . Flow modifiers proposed by these authors have had extensive testing in the plant environment with dramatic improvement in tube life provided that flow angles relative to the tube axis were kept below 30.…”

Section: Introductionmentioning

confidence: 99%

“…The area of concern for the present study is the inlet header as already discussed above in the context of the studies by Bremhorst and Lai (1979) and Lai and Bremhorst (1979). Advances in computational resources since the 1970s and the development of reliable turbulence models has allowed the replacement of experimental work in the search for ideal flow patterns applying to this particular geometry of heat exchanger (Bremhorst and Flint, 1988, 1989Nešić, 2006;López del Prá et al, 2010). The modelling approaches used by Bremhorst and Flint (1988, 1989 arose from the early limitations of computational resources necessitating the representation of the tube bundle by a porous plug with a resistance given by Darcy's law and use of symmetry to reduce the number of computational nodes.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Shell and Tube Heat Exchanger Tube Inlet Wear by Computational Fluid Dynamics

Bremhorst¹,

Brennan

2011

Engineering Applications of Computational Fluid Mechanics

View full text Add to dashboard Cite

Computational fluid mechanics is still a developing art in the prediction of erosion/corrosion often due to lack of suitable mathematical models to represent physical processes. In the present work, new flow modelling strategies have been developed for flow simulation in the inlet header of side entry shell and tube heat exchangers used in alumina plants and minerals processing plants for heat recovery. The traditional approach of treating the tube bundle as a porous plug observing Darcy's friction law has been replaced by modelling of all tubes individually and application of an inertial model for flow resistance. This better reflects the much higher velocities for the approach into the tube bundle as only about one third of the tube sheet is open area. It also includes the effect of flow separation within the inlet to some tubes which is a flow feature not able to be simulated with the porous plug approach. The traditional use of symmetry for the inlet geometry has been found to suppress the inherent asymmetry found in this flow associated with the large flow expansion from the inlet nozzle to the inlet header space. The results indicate that tube inlet wear is spread across the tube sheet more extensively than indicated by porous plug modelling. The asymmetry of flow uncovered by the new modelling technique leads to less regular wear patterns which may help to explain the difficulty of recognizing clear cut patterns of wear in processing plants. Areas of high angle of flow into tubes, variations of mass flow distributions across tube sheets and a flow component across the geometrical symmetry plane are identified. High flow angles have been found to correlate well with flow separation inside tube entrances where previous studies have shown excessive tube wear to occur. Regions where flow separation within tubes occurs have also been found to correlate well with low static pressure within the tubes downstream of the tube entrances.

show abstract

Using computational fluid dynamics in combating erosion–corrosion

Cited by 20 publications

References 6 publications

On a multiphysics approach to modelling the erosion–enhanced corrosion of low–alloy carbon steel in chloride containing environments

On a multiphysics approach to modelling the erosion–enhanced corrosion of low–alloy carbon steel in chloride containing environments

Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model

Investigation of Shell and Tube Heat Exchanger Tube Inlet Wear by Computational Fluid Dynamics

Contact Info

Product

Resources

About