Characteristics of droplet motion in effervescent sprays
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F14%3APU106930" target="_blank" >RIV/00216305:26210/14:PU106930 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1051/epjconf/20146702050" target="_blank" >http://dx.doi.org/10.1051/epjconf/20146702050</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1051/epjconf/20146702050" target="_blank" >10.1051/epjconf/20146702050</a>
Alternative languages
Result language
angličtina
Original language name
Characteristics of droplet motion in effervescent sprays
Original language description
Time resolved droplet size and velocity measurement was made using Phase-Doppler anemometry in an effervescent spray at GLR of 6 % and operation pressure drops 21 – 52 kPa. The spray shows a size dependent variation of mean as well as fluctuating axial and radial velocities of droplets similarly for all operation regimes. Particles under 13 um follow the gas flow, axially decelerated due to gas expansion. Velocity of medium sized particles is positively size correlated and larger particles keep high velocity, given them during discharge. Fluctuating radial velocity of small particles is larger than that of large particles while fluctuating axial velocity increases with size. Small particles thus reach a ratio of radial to axial velocity fluctuations ~ 0.6 but large particles only ~ 0.1, which indicates large transverse dispersion of small particles. Overall fluctuating velocity ratios smaller than 0.5 document an anisotropic character of the liquid mass fluctuations. Power spectral density (PSD) of axial velocity fluctuations of large droplets is uniform up to 1 kHz, while PSD of smaller particles drops down with frequency for frequencies > 100 Hz. Large particles thus preserve the fluctuations imposed during discharge while the gas turbulence drops with frequency. Turbulence intensity reaches 14 to 21 % depending on pressure. Such high-turbulence character of the flow probably results from a heterogeneous gas–liquid mixture at the discharge.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JR - Other machinery industry
OECD FORD branch
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Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
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
EPJ Web of Conferences
ISBN
978-80-260-5375-0
ISSN
2100-014X
e-ISSN
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Number of pages
6
Pages from-to
334-339
Publisher name
Technical university of Liberec
Place of publication
Kutná Hora
Event location
Kutná Hora
Event date
Nov 19, 2013
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000343672100053