Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2020
Volume 23
Issue 2
Topic:
Civil Engineering
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Vlasak P. , Chara Z. , Konfrst J. , Krupicka J. 2020. EFFECT OF PIPE INCLINATION ON COARSE-GRAINED PARTICLE-WATER MIXTURES FLOW
DOI:10.30825/5.ejpau.187.2020.23.2, EJPAU 23(2), #03.
Available Online: http://www.ejpau.media.pl/volume23/issue2/abs-03.html

EFFECT OF PIPE INCLINATION ON COARSE-GRAINED PARTICLE-WATER MIXTURES FLOW
DOI:10.30825/5.EJPAU.187.2020.23.2

Pavel Vlasak, Zdenek Chara, Jiri Konfrst, Jan Krupicka
Institute of Hydrodynamics CAS, Praha, Czech Republic

 

ABSTRACT

The effect of the mixture velocity, solid concentration, and pipe inclination on the coarse-grained particle–water mixtures flow behaviour, concentration distribution, and pressure drops were experimentally studied in horizontal, vertical, and inclined pipes of inner diameter D=100 mm. Graded basalt gravel was used as a solid phase. The local concentration distribution was studied with the application of a gamma-ray densitometer. The study revealed the stratified flow pattern of the coarse particle-water mixture in horizontal and inclined pipes. The particles moved principally close to the pipe invert, and particle saltation becomes the dominant mode of particle conveying for higher and moderate flow velocities. The frictional pressure droops in ascending pipe increases with increasing pipe inclination up to about 30 degrees, then gradually decreases. For the pipe inclination lower than about 30°, the effect of pipe inclination on local concentration distribution was not significant. The in-situ concentration reached higher values in the ascending than in the descending sections.

Key words: Solid-Liquid Mixture, Pipe Inclination, Pressure Drops, Concentration Distribution.

Pavel Vlasak
Institute of Hydrodynamics CAS, Praha, Czech Republic
Pod Patankou 30/5
166 12 Praha 6
Czech Republic
email: vlasak@ih.cas.cz

Zdenek Chara
Institute of Hydrodynamics CAS, Praha, Czech Republic
Pod Patankou 30/5
166 12 Praha 6
Czech Republic
email: chara@ih.cas.cz

Jiri Konfrst
Institute of Hydrodynamics CAS, Praha, Czech Republic
Pod Patankou 30/5
166 12 Praha 6
Czech Republic
email: konfrst@ih.cas.cz

Jan Krupicka
Institute of Hydrodynamics CAS, Praha, Czech Republic
Pod Patankou 30/5
166 12 Praha 6
Czech Republic
email: krupicka@ih.cas.cz

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