Publication detail
Modelling of a Free-Falling Water Droplet, Handicap of CSF Approach and Its Improvement Design
BOHÁČEK, J.
Czech title
Modelování volně padající vodní kapky, nedostatky CSF přístupu ajehonávrh na zlepšení
English title
Modelling of a Free-Falling Water Droplet, Handicap of CSF Approach and Its Improvement Design
Type
conference paper
Language
en
Original abstract
By nature, every water jet undergoes a secondary breakup from previously continuous substance to droplets. Generally, higher velocities lead into more distorted droplets, and a perfectly spherical droplet can be barely found then. However, in this study, slowly moving droplets of the circular shape were considered. The free-falling droplets (2 mm and 0.2 mm) were numerically solved to shed light on the flow field, their terminal velocity was calculated, and then some drawbacks in modelling of surface tension effects were shown. The commercial CFD package Fluent, specifically the Volume of Fluid Method with the continuous surface force model, was used. After all, several approaches were proposed to improve interface curvature estimation, and consequently to model surface tension effects more precisely.
Czech abstract
U každého vodního paprsku dochází přírozeně k sekundárnímu rozpadu z původní kontinuální substance na kapky. Obecně vysoké rychlosti vedou k větším deformacím kapek, kdy lze těžko nalézt kulatou kapku. V této studii bylo uvažováno pouze o malých kapkách.
English abstract
By nature, every water jet undergoes a secondary breakup from previously continuous substance to droplets. Generally, higher velocities lead into more distorted droplets, and a perfectly spherical droplet can be barely found then. However, in this study, slowly moving droplets of the circular shape were considered. The free-falling droplets (2 mm and 0.2 mm) were numerically solved to shed light on the flow field, their terminal velocity was calculated, and then some drawbacks in modelling of surface tension effects were shown. The commercial CFD package Fluent, specifically the Volume of Fluid Method with the continuous surface force model, was used. After all, several approaches were proposed to improve interface curvature estimation, and consequently to model surface tension effects more precisely.
Keywords in Czech
volně padající kapka, konečná rychlost, povrchové napětí
Keywords in English
free-falling droplet, terminal velocity, volume of fluid, surface tension
RIV year
2009
Released
04.11.2009
Publisher
Ústav geoniky AVČR,v.v.i.
Location
Ostrava
ISBN
978-80-86407-81-4
Book
Vodní paprsek
Pages from–to
19–28
Pages count
9
BIBTEX
@inproceedings{BUT32091,
author="Jan {Boháček},
title="Modelling of a Free-Falling Water Droplet, Handicap of CSF Approach and Its Improvement Design",
booktitle="Vodní paprsek",
year="2009",
month="November",
pages="19--28",
publisher="Ústav geoniky AVČR,v.v.i.",
address="Ostrava",
isbn="978-80-86407-81-4"
}