Detail publikace

Characteristics of droplet motion in effervescent sprays

JEDELSKÝ, J. ZAREMBA, M. MALÝ, M. JÍCHA, M.

Originální název

Characteristics of droplet motion in effervescent sprays

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

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.

Klíčová slova

Phase-Doppler analyser, droplet motion, effervescent sprays, Turbulence kinetic energy, Frequency spectra

Autoři

JEDELSKÝ, J.; ZAREMBA, M.; MALÝ, M.; JÍCHA, M.

Rok RIV

2013

Vydáno

25. 3. 2014

Nakladatel

EDP Sciences

Místo

Kutná Hora

ISBN

978-80-260-5375-0

Kniha

EPJ Web of Conferences

ISSN

2100-014X

Periodikum

EPJ Web of Conferences

Ročník

67

Číslo

1

Stát

Francouzská republika

Strany od

334

Strany do

339

Strany počet

6

URL

https://www.epj-conferences.org/articles/epjconf/abs/2014/04/epjconf_efm-13_02050/epjconf_efm-13_02050.html

Plný text v Digitální knihovně

http://hdl.handle.net/11012/194723

BibTex

@inproceedings{BUT104262,
  author="Jan {Jedelský} and Matouš {Zaremba} and Milan {Malý} and Miroslav {Jícha}",
  title="Characteristics of droplet motion in effervescent sprays",
  booktitle="EPJ Web of Conferences",
  year="2014",
  journal="EPJ Web of Conferences",
  volume="67",
  number="1",
  pages="334--339",
  publisher="EDP Sciences",
  address="Kutná Hora",
  doi="10.1051/epjconf/20146702050",
  isbn="978-80-260-5375-0",
  issn="2100-014X",
  url="https://www.epj-conferences.org/articles/epjconf/abs/2014/04/epjconf_efm-13_02050/epjconf_efm-13_02050.html"
}