Investigation of flow pattern dynamics within selected horizontal planes in mixing vessel induced by pitched blade impeller pumping downwards.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F25%3A00640597" target="_blank" >RIV/61388998:_____/25:00640597 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0263876225005611?ref=pdf_download&fr=RR-2&rr=996ac9de49571e28" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0263876225005611?ref=pdf_download&fr=RR-2&rr=996ac9de49571e28</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cherd.2025.10.024" target="_blank" >10.1016/j.cherd.2025.10.024</a>

Result language

angličtina

Original language name

Investigation of flow pattern dynamics within selected horizontal planes in mixing vessel induced by pitched blade impeller pumping downwards.

Original language description

This study presents an experimental investigation into the flow pattern dynamics within a standard mixing vessel equipped with radial baffles and a pitched-blade impeller that pumps downward. The focus is on identifying and analyzing Macro-Instabilities (MI) and quasi-periodic flow behavior using two-dimensional Particle Image Velocimetry (PIV) across six horizontal planes. The research examines both low-frequency phenomena and high-frequency fluctuations in the vicinity of the impeller. Key findings confirm the presence of primary circulation loops, impeller discharge jets, and vortex wakes behind the baffles, particularly in the region below the impeller. Through Oscillation Pattern Decomposition (OPD), quasi-periodical substructures are revealed, highlighting a distinct separation in flow dynamics above and below the impeller. The Impeller Discharge Jet (IDJ) is shown to influence vortex induction below the impeller. At the same time, the Impeller Sucking Jet (ISJ) contributes to the disintegration of macro-structures and affects vertical flow near the baffles above the impeller. The frequency analysis provides further insights into the interconnected dynamics of flow structures, complementing findings from previous studies. The investigation of flow pattern dynamics within horizontal planes reveals significant insights into the macro-structures and turbulence generated within the system. Notably, macro-instabilities are characterized by large-scale, periodic, or quasi-periodic fluctuations that extend beyond typical turbulent eddies. These instabilities impact both the velocity fields and surface swell of the liquid, driven by the interaction between the primary circulation loop (PCL) and the impeller discharge jet. Variations in flow patterns near the vessel’s baffles, as well as away from them, are observed, with baffles exerting a significant influence on local flow, particularly in the upper part of the vessel.

Czech name

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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

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OECD FORD branch

20302 - Applied mechanics

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

Chemical Engineering Research and Design

ISSN

0263-8762

e-ISSN

1744-3563

Volume of the periodical

223

Issue of the periodical within the volume

November

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

18

Pages from-to

550-567

UT code for WoS article

001606806700002

EID of the result in the Scopus database

2-s2.0-105019642869