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"
}