Coarse particles-water mixtures flow in pipes

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985874%3A_____%2F17%3A00477911" target="_blank" >RIV/67985874:_____/17:00477911 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.18454/PMI.2017.3.338" target="_blank" >http://dx.doi.org/10.18454/PMI.2017.3.338</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.18454/PMI.2017.3.338" target="_blank" >10.18454/PMI.2017.3.338</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Coarse particles-water mixtures flow in pipes

Popis výsledku v původním jazyce

The present paper is focused on evaluation of the effect of average mixture velocity and overall concentration on the pressure drop versus the slurry average velocity relationship, on slurry flow behaviour and local concentration distribution. The experimental investigation was carried out on the pipe loop of inner diameter D = 100 mm, which consists of smooth stainless steel pipes and horizontal, inclinable and vertical pipe sections. The frictional pressure drop in the horizontal pipe section were significantly higher than that in the vertical pipe due to the fact, that for stratified flow the contact load produced significant energy losses. The frictional pressure drop of coarse particles mixtures in vertical pipe increased with the increasing mixture concentration and velocity, what confirmed effect of inner friction, inter-particles collision, and the drag due to particle-liquid slip. It was found that for stratified coarse particles-water mixture the frictional pressure drop was not significantly influenced by the pipe inclination, especially for low concentration values. The effect of pipe inclination decreased with increasing mixture velocity in ascending pipe section: the maximum value was reached for inclination between 20 and 40 degrees. Inclination of pressure drop maximum increased with decreasing mixture velocity. In descending pipe section the frictional pressure drop gradually decreased with increasing pipe inclination. The effect of inclination on frictional pressure drops could be practically neglected, especially for low mixture concentration and higher flow velocities. The study revealed that the coarse particle-water mixtures in the horizontal and inclined pipe sections were significantly stratified. The particles moved principally in a layer close to the pipe invert. However, for higher and moderate flow velocities the particles moved also in the central part of the pipe cross-section, and particle saltation [ 1] was found to be dominant mode of particle conveying.nSupports under the project P105/10/1574 of the Grant Agency of the Czech Republic, and RVO: 67985874 of the Czech Academy of Sciences are gratefully acknowledged.

Název v anglickém jazyce

Coarse particles-water mixtures flow in pipes

Popis výsledku anglicky

The present paper is focused on evaluation of the effect of average mixture velocity and overall concentration on the pressure drop versus the slurry average velocity relationship, on slurry flow behaviour and local concentration distribution. The experimental investigation was carried out on the pipe loop of inner diameter D = 100 mm, which consists of smooth stainless steel pipes and horizontal, inclinable and vertical pipe sections. The frictional pressure drop in the horizontal pipe section were significantly higher than that in the vertical pipe due to the fact, that for stratified flow the contact load produced significant energy losses. The frictional pressure drop of coarse particles mixtures in vertical pipe increased with the increasing mixture concentration and velocity, what confirmed effect of inner friction, inter-particles collision, and the drag due to particle-liquid slip. It was found that for stratified coarse particles-water mixture the frictional pressure drop was not significantly influenced by the pipe inclination, especially for low concentration values. The effect of pipe inclination decreased with increasing mixture velocity in ascending pipe section: the maximum value was reached for inclination between 20 and 40 degrees. Inclination of pressure drop maximum increased with decreasing mixture velocity. In descending pipe section the frictional pressure drop gradually decreased with increasing pipe inclination. The effect of inclination on frictional pressure drops could be practically neglected, especially for low mixture concentration and higher flow velocities. The study revealed that the coarse particle-water mixtures in the horizontal and inclined pipe sections were significantly stratified. The particles moved principally in a layer close to the pipe invert. However, for higher and moderate flow velocities the particles moved also in the central part of the pipe cross-section, and particle saltation [ 1] was found to be dominant mode of particle conveying.nSupports under the project P105/10/1574 of the Grant Agency of the Czech Republic, and RVO: 67985874 of the Czech Academy of Sciences are gratefully acknowledged.

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/GAP105%2F10%2F1574" target="_blank" >GAP105/10/1574: Proudění zahuštěných a komplexních suspenzí v uzavřených profilech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Journal of Mining Institute

ISSN

2411-3336

e-ISSN

—

Svazek periodika

225

Číslo periodika v rámci svazku

2017

Stát vydavatele periodika

RU - Ruská federace

Počet stran výsledku

4

Strana od-do

338-341

Kód UT WoS článku

000407069500009

EID výsledku v databázi Scopus

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