Droplet dynamics in internally mixed twin-fluid spray
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F14%3APU111733" target="_blank" >RIV/00216305:26210/14:PU111733 - isvavai.cz</a>
Result on the web
<a href="http://www.witpress.com/elibrary/wit-transactions-on-engineering-sciences/82/27290" target="_blank" >http://www.witpress.com/elibrary/wit-transactions-on-engineering-sciences/82/27290</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2495/AFM140201" target="_blank" >10.2495/AFM140201</a>
Alternative languages
Result language
angličtina
Original language name
Droplet dynamics in internally mixed twin-fluid spray
Original language description
Effervescent atomizers are based on mixing of gas with liquid prior to discharge. We describe the discharge of two-phase mixture and movement of droplets in gas jet using simple theoretical models, following with elucidation of droplets dynamics using experimental data for an effervescent spray. Discharge of the liquid-gas flow from the nozzle is described using a combination of two discharge models. Depending on operation conditions, 59–64% of the total discharged mass corresponds to Separated Flow Model and the rest to Homogeneous Flow Model. Discharge velocity of the liquid reaches 12–27% of the gas exit velocity. The liquid-gas velocity ratio is negatively correlated with gas-to-liquid mass ratio (GLR) and positively correlated with inlet pressure. Radial profiles of axial droplet velocity, as measured using Phase Doppler anemometry, are axisymmetric bell-shaped with a maximum in the centreline analogous to the profile defined for a simple gas jet which however is more flat near the centreline and decline much faster for higher radial positions. Mean velocity in particular spray position varies with particle size within a range of several m/s typically. This variation is closely related with particle Stokes number, Stk. Variation of mean velocity with operation pressure and GLR can be explained with discharge conditions; higher pressures and GLRs lead to higher discharge velocities that are reflected in the spray downstream. Stokes numbers are generally << 1 for particle sizes Dp up to 10 um so they smoothly follow the gas flow. Stk for size 10 um <Dp< 50 um depends on flow regime and position in the spray and can be found typically within a range 0.1 < Stk < 10. Particles with Dp larger than 100 um have usually Stk > 10 and very weakly interact with the gas.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
<a href="/en/project/GAP101%2F11%2F1264" target="_blank" >GAP101/11/1264: Atomization characteristics of twin-fluid internally mixed atomizers operated at low pressure with liquids with wide range of viscosity</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Advances in Fluid Mechanics X
ISBN
978-1-84564-791-9
ISSN
1743-3533
e-ISSN
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Number of pages
12
Pages from-to
227-238
Publisher name
WIT Press
Place of publication
A Coruňa, Spain
Event location
A Coruña
Event date
Jul 1, 2014
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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