Released Air during Vapor and Air Cavitation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F16%3A86097975" target="_blank" >RIV/61989100:27230/16:86097975 - isvavai.cz</a>

Výsledek na webu

<a href="http://aip.scitation.org/doi/abs/10.1063/1.4953710" target="_blank" >http://aip.scitation.org/doi/abs/10.1063/1.4953710</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4953710" target="_blank" >10.1063/1.4953710</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Released Air during Vapor and Air Cavitation

Popis výsledku v původním jazyce

Cavitation today is a very important problem that is solved by means of experimental and mathematical methods. The article deals with the generation of cavitation in convergent divergent nozzle of rectangular cross section. Measurement of pressure, flow rate, temperature, amount of dissolved air in the liquid and visualization of cavitation area using high-speed camera was performed for different flow rates. The measurement results were generalized by dimensionless analysis, which allows easy detection of cavitation in the nozzle. For numerical simulation the multiphase mathematical model of cavitation consisting of water and vapor was created. During verification the disagreement with the measurements for higher flow rates was proved, therefore the model was extended to multiphase mathematical model (water, vapor and air), due to release of dissolved air. For the mathematical modeling the multiphase turbulence RNG model for low Reynolds number flow with vapor and air cavitation was used. Subsequently the sizes of the cavitation area were verified. in article the inlet pressure and loss coefficient depending on the amount of air added to the mathematical model are evaluated. On the basis of the approach it may be create a methodology to estimate the amount of released air added at the inlet to the modeled area.

Název v anglickém jazyce

Released Air during Vapor and Air Cavitation

Popis výsledku anglicky

Cavitation today is a very important problem that is solved by means of experimental and mathematical methods. The article deals with the generation of cavitation in convergent divergent nozzle of rectangular cross section. Measurement of pressure, flow rate, temperature, amount of dissolved air in the liquid and visualization of cavitation area using high-speed camera was performed for different flow rates. The measurement results were generalized by dimensionless analysis, which allows easy detection of cavitation in the nozzle. For numerical simulation the multiphase mathematical model of cavitation consisting of water and vapor was created. During verification the disagreement with the measurements for higher flow rates was proved, therefore the model was extended to multiphase mathematical model (water, vapor and air), due to release of dissolved air. For the mathematical modeling the multiphase turbulence RNG model for low Reynolds number flow with vapor and air cavitation was used. Subsequently the sizes of the cavitation area were verified. in article the inlet pressure and loss coefficient depending on the amount of air added to the mathematical model are evaluated. On the basis of the approach it may be create a methodology to estimate the amount of released air added at the inlet to the modeled area.

Druh

D - Stať ve sborníku

CEP obor

JR - Ostatní strojírenství

OECD FORD obor

—

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název statě ve sborníku

AIP Conference Proceedings. Volume 1745

ISBN

978-0-7354-1402-0

ISSN

0094-243X

e-ISSN

—

Počet stran výsledku

9

Strana od-do

1-9

Název nakladatele

American Institute of Physics

Místo vydání

New York

Místo konání akce

Terchova

Datum konání akce

27. 4. 2016

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

000380817100016