Publication detail

Thick liquid film instability model using CFD simulations

KNOTEK, S. JÍCHA, M.

Czech title

Model nestability kapalného filmu s využitím CFD simulací

English title

Thick liquid film instability model using CFD simulations

Type

journal article - other

Language

en

Original abstract

The article presents a liquid film instability model designed using results of the set of CFD simulations. The governing equations of the model are derived using a linear equation of motion. The stability analysis is carried out by imposing a liquid surface disturbance which growth rate is investigated in dependence on the geometrical and physical configuration. The gas effect parameters, which are decisive variables in the model, are derived using results of the set of CFD simulations of turbulent flow in channel with wavy surface. The agreement between predicted and measured critical gas velocities and wavelengths in dependence on the liquid film thickness is very good.

Czech abstract

Článek prezentuje model nestability kapalného filmu navržený s použitím výsledků sady CFD simulací. Rovnice modelu jsou odvozeny na základě lineární pohybové rovnice. Analýza stability je provedena pomocí modelu výchylek, jejichž rychlost růstu je zkoumána v závislosti na geometrické a fyzikální konfiguraci. Parametry účinku plynu, které jsou rozhodujícími proměnnými v modelu jsou odvozeny s využitím výsledků CFD simulací turbulentního proudění v kanálu se zvlněným povrchem. Shoda mezi predikovanými a naměřenými kritickými rychlostmi plynu a vlnovými délkami vzniklých vln v závislosti na tloušťce filmu je velmi dobrá.

English abstract

The article presents a liquid film instability model designed using results of the set of CFD simulations. The governing equations of the model are derived using a linear equation of motion. The stability analysis is carried out by imposing a liquid surface disturbance which growth rate is investigated in dependence on the geometrical and physical configuration. The gas effect parameters, which are decisive variables in the model, are derived using results of the set of CFD simulations of turbulent flow in channel with wavy surface. The agreement between predicted and measured critical gas velocities and wavelengths in dependence on the liquid film thickness is very good.

Keywords in Czech

kapalný film, nestability, vlny, CFD

Keywords in English

liquid film, instability, waves, CFD

RIV year

2013

Released

01.12.2013

ISSN

1802-1484

Volume

20

Number

3/4

Pages from–to

247–254

Pages count

8

BIBTEX


@article{BUT105617,
  author="Stanislav {Knotek} and Miroslav {Jícha},
  title="Thick liquid film instability model using CFD simulations",
  year="2013",
  volume="20",
  number="3/4",
  month="December",
  pages="247--254",
  issn="1802-1484"
}