Gamma-ray-based measurement of concentration distribution in pipe flow of settling slurry: vertical profiles and tomographic maps

Krupička, Jan; Matoušek, Václav

doi:10.2478/johh-2014-0012

Cited by 27 publications

(13 citation statements)

References 9 publications

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“…6 the effect of the angle of inclination on the shape of experimental chord-averaged concentration profiles, c v (y), is illustrated for three different slurry velocities V and pipe inclination from horizontal to +45° or -45° at constant transport concentration C d = 0.25. The concentration profiles confirmed the stratified flow pattern in inclined pipe sections (Krupicka and Matousek, 2014;Vlasak et al, 2016Vlasak et al, , 2017. The concentration profiles showed different degrees of stratification for the positive and negative slope of the flow.…”

Section: Local Concentration Distributionsupporting

confidence: 65%

Experimental investigation of fine-grained settling slurry flow behaviour in inclined pipe sections

Vlasák

Chára

Matoušek

et al. 2019

Journal of Hydrology and Hydromechanics

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For the safe and economical design and operation of freight pipelines it is necessary to know slurry flow behaviour in inclined pipe sections, which often form significant part of pipelines transporting solids. Fine-grained settling slurry was investigated on an experimental pipe loop of inner diameter D = 100 mm with the horizontal and inclined pipe sections for pipe slopes ranging from −45° to +45°. The slurry consisted of water and glass beads with a narrow particle size distribution and mean diameter d50 = 180 µm. The effect of pipe inclination, mean transport volumetric concentration, and slurry velocity on flow behaviour, pressure drops, deposition limit velocity, and concentration distribution was studied. The study revealed a stratified flow pattern of the studied slurry in inclined pipe sections. Frictional pressure drops in the ascending pipe were higher than that in the descending pipe, the difference decreased with increasing velocity and inclination. For inclination less than about 25° the effect of pipe inclinations on deposition limit velocity and local concentration distribution was not significant. For descending pipe section with inclinations over −25° no bed deposit was observed.

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Section: Local Concentration Distributionsupporting

confidence: 65%

Experimental investigation of fine-grained settling slurry flow behaviour in inclined pipe sections

Vlasák

Chára

Matoušek

et al. 2019

Journal of Hydrology and Hydromechanics

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“…6-8, the chord-averaged concentration profiles, c v (y), are illustrated for different pipe inclinations α and slurry velocities V close to deposition limit V D . The concentration profiles showed different degrees of stratification for the positive and negative pipe inclination (Krupicka and Matousek, 2014;Vlasak et al, 2016Vlasak et al, , 2017Vlasak et al, , 2018a. The degree of stratification varied with the pipe inclination, decreasing with increasing pipe inclination and slurry velocity for both the ascending and descending pipe sections.…”

Section: Concentration Distributionmentioning

confidence: 95%

“…A multi-channel digital analyzer enabled the evaluation of the energy spectrum of the detected signal. The measuring time period of 16 seconds was used to sense the local concentration at each position (Krupicka and Matousek, 2014;Vlasak et al, 2014).…”

Section: Experimental Equipment and Materialsmentioning

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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“…In order to evaluate our predictive modelling approach, we carried out experimental measurements with fraction of medium to coarse sand in 100mm pipe loop at Institute of Hydrodynamics of the Czech Academy of Sciences in summer of 2017 and 2018. The experimental set-up, methods and results are described in [3,4] The pipe loop contains a tilting section, which can be inclined to an arbitrary slope between horizontal and vertical. The tests were carried out in various slopes from 0 to -45 degrees.…”

Section: Experimental Modelling Of Sand Slurry Flowmentioning

confidence: 99%

Settling slurry flow near deposition velocity in inclined pipe of negative slope

2019

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Pipe flow of sand-water slurry (settling slurry) is sensitive to pipe inclination. The effect of the angle to which the partially stratified flow is inclined from the horizontal has been subject to investigation in numerous studies. However, almost all of them focus on ascending flows, i.e. flows inclined to positive angles of inclination. It is well known that settling slurry flows inclined to negative slopes (descending flows) differ from those inclined to positive slopes, particularly at velocities near the deposition limit. The deposition limit velocity is the flow velocity at which stationary deposit starts to be formed at the bottom of the pipe. We investigate the effect of the negative slope on pipe flow near deposition limit velocity in the broad range of inclination angles. Besides the deposition limit, we focus on the distribution of solids across the pipe cross section. We combine experimental approach with mathematical modelling. Our new experiments with medium-to-coarse sand (mass-medium grain size 0.87 mm) in a 100-mm pipe inclined from 0 to -45 degree provide suitable data for a validation of predictions of our layered model for partially stratified flows in inclined pipes.

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Gamma-ray-based measurement of concentration distribution in pipe flow of settling slurry: vertical profiles and tomographic maps

Cited by 27 publications

References 9 publications

Experimental investigation of fine-grained settling slurry flow behaviour in inclined pipe sections

Experimental investigation of fine-grained settling slurry flow behaviour in inclined pipe sections

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

Settling slurry flow near deposition velocity in inclined pipe of negative slope

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