A combined CFD-experimental method for abrasive erosion testing of concrete

Messa, Gianandrea Vittorio; Branco, Renan de Lima; Filho, José Gilberto Dalfré; Malavasi, Stefano

doi:10.1515/johh-2017-0042

Cited by 11 publications

(6 citation statements)

References 27 publications

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“…Layered models are based on principles formulated originally by Wilson (1976) and are expressed as force balances applied to layers of stratified flow. The layered models exist in different versions for fully or partially stratified flows and some have been adapted to inclined flows (Doron, et al 1997;Matousek, 1996;Matousek et al, 2018a;Messa et al, 2018;Shook and Roco, 1991;Wilson et al, 2006). Wilson used his early version of the two-layer model for horizontal fully stratified flow to calculate the deposition velocity from the force balance on the bed at the slip point (i.e.…”

Section: Introductionmentioning

confidence: 99%

Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

Vlasák

Matoušek

Chára

et al. 2020

Journal of Hydrology and Hydromechanics

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Sand-water slurry was investigated on an experimental pipe loop of inner diameter D = 100 mm with the horizontal, inclined, and vertical smooth pipe sections. A narrow particle size distribution silica sand of mean diameter 0.87 mm was used. The experimental investigation focused on the effects of pipe inclination, overall slurry concentration, and mean velocity on concentration distribution and deposition limit velocity. The measured concentration profiles showed different degrees of stratification for the positive and negative pipe inclinations. The degree of stratification depended on the pipe inclination and on overall slurry concentration and velocity. The ascending flow was less stratified than the corresponding descending flow, the difference increasing from horizontal flow up to an inclination angle of about +30°. The deposition limit velocity was sensitive to the pipe inclination, reaching higher values in the ascending than in the horizontal pipe. The maximum deposition limit value was reached for an inclination angle of about +25°, and the limit remained practically constant in value, about 1.25 times higher than that in the horizontal pipe. Conversely, in the descending pipe, the deposition limit decreased significantly with the negative slopes and tended to be zero for an inclination angle of about −30°, where no stationary bed was observed.

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Section: Introductionmentioning

confidence: 99%

Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

Vlasák

Matoušek

Chára

et al. 2020

Journal of Hydrology and Hydromechanics

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“…The operational velocity is velocity at which the system should operate safe and without a danger of pipe blockage, and of course with acceptable energy consumption. Usually it is the velocity slightly above the so called a deposition limit velocity, Vdl, which is defined as slurry velocity at which conveyed particles stop moving and start to form deposit at the bottom of a pipe [1,2,3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of pipe inclination on flow behaviour of fine-grained settling slurry

et al. 2019

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The effect of flow parameters of fine-grained settling slurry on the pressure drop-velocity relationship, deposition limit velocity and local concentration distribution was studied in an experimental pipe loop of inner diameter D = 100 mm with inclinable pipe sections for pipe inclination ranging from – 45° to +45°. The slurry consisted from water and narrow particle size distribution glass beads of mean diameter d50 = 0.18 mm. The concentration distribution was studied with application of a gamma-ray densitometry. The deposition velocity was defined as the flow velocity at which stationary deposit started to be formed at the pipe invert. The study revealed the stratified flow pattern of the studied slurry in inclined pipe sections, for slurry velocities below to the deposition limit sliding or stationary bed were created in ascending pipe sections. For low pipe inclination (α < ± 25°) the effect of inclination on local concentration distribution was not significant. Mean transport concentration for descending flow was lower than that for the ascending flow Deposition limit in inclined pipe was slightly lower than that in horizontal pipe. Frictional pressure drops in ascending pipe were higher than that in descending pipe, the difference decreased with increasing velocity and inclination.

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“…The design of the tank used in this work is based on the device used by Messa et al [28] in the study of the erosion-abrasion of a waterborne particle on submerged concrete. Figure 2 shows the experimental setup, which consists of a steel cylindrical tank filled with water.…”

Section: Validation Of the Cfd Modelmentioning

confidence: 99%

“…In addition, the dimensions of the specimens (305 mm radius and 102 mm high cylinders) make handling difficult. Various authors have tried to develop alternative tests to ASTM C1138 [28][29][30][31][32][33]. Their results differ from one another depending on how they simulate actual service conditions.…”

Section: Introductionmentioning

confidence: 99%

Erosive Degradation Study of Concrete Augmented by Mussel Shells for Marine Construction

Camba

Mier

Carral

et al. 2021

JMSE

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This work proposes a green material for artificial reefs to be placed in Galicia (northwest Spain) taking into account the principles of circular economy and sustainability of the ecosystem. New concrete formulations for marine applications, based on cement and/or sand replacement by mussel shells, are analyzed in terms of resistance to abrasion. The interest lies in the importance of the canning industry of Galicia, which generates important quantities of shell residues with negative environmental consequences. Currently, the tests to determine the abrasion erosion resistance of concrete on hydraulic structures involve large and complex devices. According to this, an experimental test has been proposed to estimate and compare the wear resistance of these concretes and, consequently, to analyze the environmental performance of these structures. First, a numerical analysis validated with experimental data was conducted to design the test. Subsequently, experimental tests were performed using a slurry tank in which samples with conventional cement and sand were partially replaced by mussel shell. The abrasive erosion effect of concrete components was analyzed by monitoring the mass loss. It shows an asymptotic trend with respect to time that has been modeled by Generalized Additive Model (GAM) and nonlinear regression models. The results were compared to concrete containing only conventional cement and sand. Replacing sand and/or cement by different proportions of mussel shells has not significantly reduced the resistance of concrete against erosive degradation, except for the case where a high amount of sand (20 wt.%) is replaced. Its resistance against the erosive abrasion is increased, losing between 0.1072 and 0.0310 wt.% lower than common concrete. In all the remaining cases (replacements of the 5–10 wt.% of sand and cement), the effect of mussel replacement on erosive degradation is not significant. These results encourage the use of mussel shells in the composition of concrete, taking into account that we obtain the same degradation properties, even more so considering an important residue in the canning industry (and part of the seabed) that can be valorized.

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A combined CFD-experimental method for abrasive erosion testing of concrete

Cited by 11 publications

References 27 publications

Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

Concentration distribution and deposition limit of medium-coarse sand-water slurry in inclined pipe

Effect of pipe inclination on flow behaviour of fine-grained settling slurry

Erosive Degradation Study of Concrete Augmented by Mussel Shells for Marine Construction

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