Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F14%3A00420876" target="_blank" >RIV/67985874:_____/14:00420876 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1080/02726351.2013.840706" target="_blank" >http://dx.doi.org/10.1080/02726351.2013.840706</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/02726351.2013.840706" target="_blank" >10.1080/02726351.2013.840706</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles

Popis výsledku v původním jazyce

Concentration distribution of two fractions of glass-bead (ballotini) particles (medium size 0.44 mm, 0.53 mm respectively) in flows of heterogeneous slurry was measured in a laboratory pipe of the internal diameter of 100 mm using a radiometric device. Particles in such flows are supported by both interparticle contacts and turbulent eddies and the solids load must be considered as combined load composed of both contact-, and suspended load. Flows tend to be partially stratified and if high concentrated (mean volumetric concentration of solids higher than approximately 20 per cent) they exhibit a sliding bed. It appears that two most common methods to calculate concentration profiles in settling-slurry flows are not able to handle the sliding bed adequately. A comparison of the test results with the Gillies-Shook model for combined-load flows shows that the modeling approach requires further refinements. An application of the more recent Kaushal-Tomita model based on the turbulent-diffusion concept is inappropriate in high-concentrated slurries composed of medium-to-coarse grains. A simple 1-D model is proposed that takes conditions for an existence of a sliding bed into account and predicts a simplified concentration profile in stratified flows composed of a sliding bed and a transport layer above the bed.

Název v anglickém jazyce

Distribution of medium-to-coarse glass beads in slurry pipe flow: evaluation of measured concentration profiles

Popis výsledku anglicky

Concentration distribution of two fractions of glass-bead (ballotini) particles (medium size 0.44 mm, 0.53 mm respectively) in flows of heterogeneous slurry was measured in a laboratory pipe of the internal diameter of 100 mm using a radiometric device. Particles in such flows are supported by both interparticle contacts and turbulent eddies and the solids load must be considered as combined load composed of both contact-, and suspended load. Flows tend to be partially stratified and if high concentrated (mean volumetric concentration of solids higher than approximately 20 per cent) they exhibit a sliding bed. It appears that two most common methods to calculate concentration profiles in settling-slurry flows are not able to handle the sliding bed adequately. A comparison of the test results with the Gillies-Shook model for combined-load flows shows that the modeling approach requires further refinements. An application of the more recent Kaushal-Tomita model based on the turbulent-diffusion concept is inappropriate in high-concentrated slurries composed of medium-to-coarse grains. A simple 1-D model is proposed that takes conditions for an existence of a sliding bed into account and predicts a simplified concentration profile in stratified flows composed of a sliding bed and a transport layer above the bed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/GA103%2F09%2F0383" target="_blank" >GA103/09/0383: Vnitřní struktura proudění heterogenních suspenzí</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2014

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Particulate Science and Technology

ISSN

0272-6351

e-ISSN

—

Svazek periodika

32

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

186-196

Kód UT WoS článku

000329154100013

EID výsledku v databázi Scopus

2-s2.0-84891928844