The experimental study of oscillation dynamics of free vortex surface in the uncovered unbaffled stirred vessel

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F17%3A43914116" target="_blank" >RIV/60461373:22340/17:43914116 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

The experimental study of oscillation dynamics of free vortex surface in the uncovered unbaffled stirred vessel

Popis výsledku v původním jazyce

In chemical, biochemical and food processes, apparatuses for mixing are frequently used, among which there are mechanically stirred unbaffled tank reactors. Often, a batch used in these apparatuses exhibits increased viscosity in comparison with water. Knowledge of oscillation characteristics is essential for the right determination of resonances of the system. The oscillation characteristic could be observed as a free vortex surface resonance which creates several oscillation waves. The case of small amount of oscillation waves with the high amplitude can result into the hazardous situations. The oscillation characteristics such as natural oscillation frequencies are dependent on several input parameters. Commonly used equations for natural oscillation frequency estimation does not reflect the effect of increased viscosity. However, a viscous batch exhibits specific behavior during mixing. These specifics have not been examined enough yet. In this work, original experimental data and results for natural oscillation frequencies in water and viscous batch are presented. Natural oscillation frequencies were measured on a laboratory vessel with the diameter of 0.49 m. Natural frequencies were measured by collecting velocity time series with Pitot tube system for various types of impeller configurations, various impeller speed and two kinds of the batch. Describing and prediction of the sloshing behavior during a variety of mixing processes could lead to the more precise industrial design and a better understanding of mixing in unbaffled vessel overall.

Název v anglickém jazyce

The experimental study of oscillation dynamics of free vortex surface in the uncovered unbaffled stirred vessel

Popis výsledku anglicky

In chemical, biochemical and food processes, apparatuses for mixing are frequently used, among which there are mechanically stirred unbaffled tank reactors. Often, a batch used in these apparatuses exhibits increased viscosity in comparison with water. Knowledge of oscillation characteristics is essential for the right determination of resonances of the system. The oscillation characteristic could be observed as a free vortex surface resonance which creates several oscillation waves. The case of small amount of oscillation waves with the high amplitude can result into the hazardous situations. The oscillation characteristics such as natural oscillation frequencies are dependent on several input parameters. Commonly used equations for natural oscillation frequency estimation does not reflect the effect of increased viscosity. However, a viscous batch exhibits specific behavior during mixing. These specifics have not been examined enough yet. In this work, original experimental data and results for natural oscillation frequencies in water and viscous batch are presented. Natural oscillation frequencies were measured on a laboratory vessel with the diameter of 0.49 m. Natural frequencies were measured by collecting velocity time series with Pitot tube system for various types of impeller configurations, various impeller speed and two kinds of the batch. Describing and prediction of the sloshing behavior during a variety of mixing processes could lead to the more precise industrial design and a better understanding of mixing in unbaffled vessel overall.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA15-21715S" target="_blank" >GA15-21715S: Experimentální studie přenosu hmoty kapalina-plyn za přítomnosti pevných částis a ve viskózní vsádce</a><br>

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název statě ve sborníku

PROCEEDINGS 44th International Conference of the Slovak Society of Chemical Engineering

ISBN

978-80-89597-58-1

ISSN

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e-ISSN

neuvedeno

Počet stran výsledku

11

Strana od-do

290-300

Název nakladatele

Slovak Society of Chemical Engineering

Místo vydání

Bratislava

Místo konání akce

Demänovská dolina

Datum konání akce

22. 5. 2017

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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