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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20302 - Applied mechanics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Research and Design

ISSN

0263-8762

e-ISSN

1744-3563

Svazek periodika

223

Číslo periodika v rámci svazku

November

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

18

Strana od-do

550-567

Kód UT WoS článku

001606806700002

EID výsledku v databázi Scopus

2-s2.0-105019642869