Effect of the Concentration of Sand in a Mixture of Water and Sand Flowing through PP and PVC Elbows on the Minor Head Loss Coefficient

Wichowski, Piotr; Siwiec, Tadeusz; Kalenik, M.

doi:10.20944/preprints201902.0230.v1

Cited by 5 publications

(3 citation statements)

References 24 publications

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“…At the same time, it is indicated that the roughness of steel and copper pipes increases during operation, and in metal-plastic pipes this indicator remains unchanged for the entire service period [7]. [16][17][18][19]. Currently, researchers are most often engaged in mathematical modeling of current structures using numerical models [20][21][22][23][24].…”

Section: Tables Of Reference Bookmentioning

confidence: 99%

Experimental Evaluation of Hydraulic Resistance of Pipelines from Modern Polymer Materials

Paliivets¹

2022

Preprint

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The aim of the studies was to test the hydraulic pressure losses along the length, local pressure losses, absolute and relative roughness values of the pipeline walls made of modern polymer material. The article presents the results of the experimental studies of hydraulic resistance of pipelines from modern polymer materials, the method of theoretical determination of resistance coefficients in the VALTEC ISO 21003 metal polymer pipeline, the classification and method of determining the values of local hydraulic resistance coefficients of T-Junctions are given, the dependence for determining the Darcy λ hydraulic friction coefficient associated with the value of the equivalent hydraulic roughness coefficient of the inner surface of pipes and the Reynolds number. The experimental data of the hydraulic coefficient of friction Darcy λ was compared with the known theoretical relationships of A.D. Altschul, Colbrooke for smooth pipes, Colbrooke and White, an alternative to the Colbrooke-White, Offengenden equation for low-shear pipes and pipes from polymer materials with Reynolds numbers Re>10^4. Dependence of hydraulic coefficient of friction on relative equivalent roughness of pipeline walls and Reynolds number, specific energy loss per one linear meter on total flow rate in system of hydraulically short pipeline is obtained. The empirical dependence of values of coefficients of local resistance ζ=f(Q2/Q3) from a ratio of the divided expenses of Q2/Q3 of the equal-pass T-Junction α=90 the pipeline to a branch up, on pass in the direct T-Junction and division of streams at various internal pipeline diameters of VALTEC.

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Section: Tables Of Reference Bookmentioning

confidence: 99%

Experimental Evaluation of Hydraulic Resistance of Pipelines from Modern Polymer Materials

Paliivets¹

2022

Preprint

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“…In literature, the large number of experimental investigations on erosive wear has been performed on the domain of multiphase flow in the last decades such as studies done by Sedrez et al [ 11 ], Zahedi et al [ 12 ], Vieira et al [ 13 ], Parsi et al [ 14 ], and Owen et al [ 15 ]. However, experimental investigations, with all the recent developments, were not triumphant in precipitating results with acceptable accuracy in multiphase flow ascribed to the involvement of the highly turbulent liquid and solid particle interactions [ 16 ]. Postlethwaite and Nesic [ 17 ] mentioned that the turbulent flow, pressure impact, solid particle impaction, and suspended liquid droplets impaction are the sources of mechanical forces that cause erosion-corrosion in multiphase flow.…”

Section: Introductionmentioning

confidence: 99%

“…However, in all the available studies of elbow configurations, only a single level of particle concentration was used to simulate the amount of erodent in carrier phase which does not provide the whole detail about the influence of sand concentration on erosion-corrosion rate and extent of erosion. Moreover, sand fines transport at lower flow velocities and low concentration levels can cause the formation of a deposition layer that enhances erosion and corrosion problems [ 16 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Sand Fines Concentration on the Erosion-Corrosion Mechanism of Carbon Steel 90° Elbow Pipe in Slug Flow

Khan

Pao

et al. 2020

Materials

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Erosion-corrosion of elbow configurations has recently been a momentous concern in hydrocarbon processing and transportation industries. The carbon steel 90° elbows are susceptible to the erosion-corrosion during the multiphase flow, peculiarly for erosive slug flows. This paper studies the erosion-corrosion performance of 90° elbows at slug flow conditions for impact with 2, 5, and 10 wt.% sand fines concentrations on AISI 1018 carbon steel exploiting quantitative and qualitative analyses. The worn surface analyses were effectuated by using laser confocal and scanning electron microscopy. The experiment was conducted under air and water slug flow containing sand fines of 50 µm average size circulated in the closed flow loop. The results manifest that with the increase of concentration level, the erosion-corrosion magnitude increases remarkably. Sand fines instigate the development of perforation sites in the form of circular, elongated, and coalescence pits at the elbow downstream and the corrosion attack is much more obvious with the increase of sand fines concentration. Another congruent finding is that cutting and pitting corrosion as the primitive causes of material degradation, the 10 wt.% sand fines concentration in carrier phase increases the erosion-corrosion rate of carbon steel up to 93% relative to the 2 wt.% sand fines concentration in slug flow.

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Multicomponent Water Effects on Rotating Machines Disk Erosion

Yang

Hou

et al. 2020

Water

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When sand particles are entrained into carrier flow, such as liquid, a strong interaction occurs with the surface of the metallic material, resulting in serious erosion damage. However, the effect of the physical properties of particles and materials on erosion characteristics has not been well studied. In this paper, the erosion-wear behavior of a rotating disc surface under the action of solid–liquid two-phase flow was studied by using the discrete particle model (DPM). The wear effects on the surface of sample due to particle diameter (d = 0.1 mm, d = 0.2 mm, d = 0.3 mm, d = 0.4 mm), particle volume fraction (CV = 2%, CV = 3%, CV = 4%, CV = 5%), and particle inlet velocity (v = 1.05 m/s, v = 2.05 m/s, v = 3.05 m/s, v = 4.05 m/s) were analyzed using representative values of operating conditions of rotating machines. The results show that the wear amount increases exponentially with the radius, whilst the maximum wear amount increases faster than the average wear amount with the particle volume fraction. The surface wear grows inversely with the particle diameter but slightly with the particle inlet velocity. A case study of stainless steel samples at different radius positions on the surface of rotating disc is carried out using a mixed velocity of sand and water of 2.05 m/s, an average particle size of 0.1 mm, and a concentration of CV = 2.5%. The experiments show the wear amount increases with the radius on the surface of the rotating disc, just as predicted by the numerical simulation. Two important findings emerge from the study: (1) the wear morphology of the specimen surface develops from two to three regions; (2) when the basal body is rotating at high speed, the wear degree is influenced more by the circumferential than particle inlet velocity. The wear morphology was observed by using a scanning electron microscope (SEM). It exhibited a mixture of fine and coarse scratches and pits, and the distribution of these varied according to the radial distance of the disc.

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Effect of the Concentration of Sand in a Mixture of Water and Sand Flowing through PP and PVC Elbows on the Minor Head Loss Coefficient

Cited by 5 publications

References 24 publications

Experimental Evaluation of Hydraulic Resistance of Pipelines from Modern Polymer Materials

Experimental Evaluation of Hydraulic Resistance of Pipelines from Modern Polymer Materials

Effect of Sand Fines Concentration on the Erosion-Corrosion Mechanism of Carbon Steel 90° Elbow Pipe in Slug Flow

Multicomponent Water Effects on Rotating Machines Disk Erosion

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