Large heavy particles in turbulent pipe flows: Skin friction drag, turbulence modulation and preferential particle distribution

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F25%3A00642519" target="_blank" >RIV/61388998:_____/25:00642519 - isvavai.cz</a>

Result on the web

<a href="https://pubs.aip.org/aip/pof/article-abstract/37/11/113337/3373287/Large-heavy-particles-in-turbulent-pipe-flows-Skin?redirectedFrom=fulltext" target="_blank" >https://pubs.aip.org/aip/pof/article-abstract/37/11/113337/3373287/Large-heavy-particles-in-turbulent-pipe-flows-Skin?redirectedFrom=fulltext</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0292384" target="_blank" >10.1063/5.0292384</a>

Result language

angličtina

Original language name

Large heavy particles in turbulent pipe flows: Skin friction drag, turbulence modulation and preferential particle distribution

Original language description

Previous studies on particle-laden flows have focused mainly on either small, heavy particles or large, and weakly buoyant particles. We present measurements in the regime of large and heavy particles, investigating the particle-turbulence dynamics over a parameter space covering a wide range of particle volume fractions, Stokes and Froude numbers at low to moderate Reynolds numbers. We consider the flow in a vertical pipe, thus allowing for the investigation of the two-way coupling between particles and the carrier phase turbulence while excluding the effect of gravity-induced settling on the wall-normal migration of particles. Pressure drop measurements indicate a linear increase in the skin friction coefficient with the volume fraction of particles. The growth rate of the skin friction coefficient was found to scale inversely with the Froude number. Using time-resolved particle image velocimetry measurements, we show that the carrier phase turbulence is modulated even at particle concentrations as low as 0.3%, indicating that particle-induced stresses due to the distortion of fluid streamlines cannot be neglected. Additionally, using Voronoi tessellations to quantify the particle concentration field, we observe a strong deviation from the Poisson behavior for cases both with and without turbophoresis. The results of particle tracking show that the particles move in roughly straight-line trajectories, which deviate from the flow streamlines with a mean angle of about 2 degrees and a maximum angle of about 9 degrees. The particles were also observed to be situated away from vortex cores indicating the occurrence of the centrifuge mechanism.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10305 - Fluids and plasma physics (including surface physics)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Physics of Fluids

ISSN

1070-6631

e-ISSN

1089-7666

Volume of the periodical

37

Issue of the periodical within the volume

11

Country of publishing house

US - UNITED STATES

Number of pages

27

Pages from-to

113337

UT code for WoS article

001624283000012

EID of the result in the Scopus database

2-s2.0-105022792743