Change of agitation power when emptying the tank for propeller impellers

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F25%3A00383840" target="_blank" >RIV/68407700:21220/25:00383840 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.24425/cpe.2025.153668" target="_blank" >https://doi.org/10.24425/cpe.2025.153668</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.24425/cpe.2025.153668" target="_blank" >10.24425/cpe.2025.153668</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Change of agitation power when emptying the tank for propeller impellers

Popis výsledku v původním jazyce

In this study, the phenomenon of mixing power increase when emptying tanks with an operating propeller impeller was examined. The tests were carried out for impellers with wide and narrow blades in two geometrically similar tanks with diameters T = 545 mm and T = 300 mm equipped with four standard baffles. The varied mixing power during tank emptying was examined on a larger scale, and on a scale of T = 300 mm the distribution of axial and radial velocities in the vertical r-z plane was determined using the PIV system. A very large increase in mixing power was found when the liquid-free surface being lowered was close to the upper surface of the blades. In the limit case, as much as a three-fold increase in mixing power was observed compared to the mixing power in a tank completely filled. It was found that the increase in mixing power was caused by a change in the mode of liquid circulation in the mixing tank when the liquid surface approached the impeller area. Correlation equations determining the values of the mixing power increase factor depending on the geometric parameters of the impeller and the Froude number are given. The values for propeller impellers were compared with similar values obtained for other types of impellers.

Název v anglickém jazyce

Change of agitation power when emptying the tank for propeller impellers

Popis výsledku anglicky

In this study, the phenomenon of mixing power increase when emptying tanks with an operating propeller impeller was examined. The tests were carried out for impellers with wide and narrow blades in two geometrically similar tanks with diameters T = 545 mm and T = 300 mm equipped with four standard baffles. The varied mixing power during tank emptying was examined on a larger scale, and on a scale of T = 300 mm the distribution of axial and radial velocities in the vertical r-z plane was determined using the PIV system. A very large increase in mixing power was found when the liquid-free surface being lowered was close to the upper surface of the blades. In the limit case, as much as a three-fold increase in mixing power was observed compared to the mixing power in a tank completely filled. It was found that the increase in mixing power was caused by a change in the mode of liquid circulation in the mixing tank when the liquid surface approached the impeller area. Correlation equations determining the values of the mixing power increase factor depending on the geometric parameters of the impeller and the Froude number are given. The values for propeller impellers were compared with similar values obtained for other types of impellers.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20402 - Chemical process engineering

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 AND PROCESS ENGINEERING-NEW FRONTIERS

ISSN

0208-6425

e-ISSN

2300-1925

Svazek periodika

46

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

PL - Polská republika

Počet stran výsledku

8

Strana od-do

—

Kód UT WoS článku

001459671700001

EID výsledku v databázi Scopus

2-s2.0-105002293752