Publication detail

Effervescent atomizer - temporal and spatial variations of spray structure

JEDELSKÝ, J. JÍCHA, M.

Original Title

Effervescent atomizer - temporal and spatial variations of spray structure

English Title

Effervescent atomizer - temporal and spatial variations of spray structure

Type

conference paper

Language

en

Original Abstract

An effervescent atomizer generated spray is studied using combined PIV-PLIF technique. Liquid phase concentration, 3D velocity and thus mass flux distribution in a plane perpendicular to the spray axis is measured. Spatial and temporal fluctuations of the liquid concentration and mass flux are evaluated. Both fluctuations show annular spatial distribution with low value near spray axis and maximum close to the spray edge. A transparent Plexiglass atomizer is used in this study. Internal atomizer two-phase flow patterns are predicted by published maps and actual two-phase flow structure is visualized by a digital camera. The atomizer is operated in the range of air gauge pressure 0.1 - 0.5 MPa and Gas-to-Liquid-Ratio 2 - 50%. This range of operation conditions leads to various two-phase flow patterns from bubbly to dispersed. Results show that in case of high GLR the internal mixture is relatively homogeneous and decreasing GLR under certain value can lead to a poor mixing. Influence of operation conditions as well as influence of internal two-phase flow pattern on the fluctuations of the liquid concentration and mass flux is documented. It is seen that the operation of the atomizer under low GLR when an inhomogeneous mixture inside atomizer chamber exists leads to an unsteady spray.

English abstract

An effervescent atomizer generated spray is studied using combined PIV-PLIF technique. Liquid phase concentration, 3D velocity and thus mass flux distribution in a plane perpendicular to the spray axis is measured. Spatial and temporal fluctuations of the liquid concentration and mass flux are evaluated. Both fluctuations show annular spatial distribution with low value near spray axis and maximum close to the spray edge. A transparent Plexiglass atomizer is used in this study. Internal atomizer two-phase flow patterns are predicted by published maps and actual two-phase flow structure is visualized by a digital camera. The atomizer is operated in the range of air gauge pressure 0.1 - 0.5 MPa and Gas-to-Liquid-Ratio 2 - 50%. This range of operation conditions leads to various two-phase flow patterns from bubbly to dispersed. Results show that in case of high GLR the internal mixture is relatively homogeneous and decreasing GLR under certain value can lead to a poor mixing. Influence of operation conditions as well as influence of internal two-phase flow pattern on the fluctuations of the liquid concentration and mass flux is documented. It is seen that the operation of the atomizer under low GLR when an inhomogeneous mixture inside atomizer chamber exists leads to an unsteady spray.

Keywords

effervescent atomization, Planar Laser-Induced-Fluorescence, Particle Image Velocimetry, spray structure

RIV year

2006

Released

01.08.2006

Publisher

Institute for Liquid Atomization and Spray Systems - Japan

Location

Kyoto.,Japan

ISBN

4-9902774-1-4

Book

Proceedings 10th International Congress on Liquid Atomization and Spray Systems ICLASS-2006

Edition

1

Edition number

1

Pages from

1

Pages to

8

Pages count

8

BibTex


@inproceedings{BUT19879,
  author="Jan {Jedelský} and Miroslav {Jícha}",
  title="Effervescent atomizer - temporal and spatial variations of spray structure",
  annote="An effervescent atomizer generated spray is studied using combined PIV-PLIF technique. Liquid phase concentration, 3D velocity and thus mass flux distribution in a plane perpendicular to the spray axis is measured. Spatial and temporal fluctuations of the liquid concentration and mass flux are evaluated. Both fluctuations show annular spatial distribution with low value near spray axis and maximum close to the spray edge. A transparent Plexiglass atomizer is used in this study. Internal atomizer two-phase flow patterns are predicted by published maps and actual two-phase flow structure is visualized by a digital camera. The atomizer is operated in the range of air gauge pressure 0.1 - 0.5 MPa and Gas-to-Liquid-Ratio 2 - 50%. This range of operation conditions leads to various two-phase flow patterns from bubbly to dispersed. Results show that in case of high GLR the internal mixture is relatively homogeneous and decreasing GLR under certain value can lead to a poor mixing. Influence of operation conditions as well as influence of internal two-phase flow pattern on the fluctuations of the liquid concentration and mass flux is documented. It is seen that the operation of the atomizer under low GLR when an inhomogeneous mixture inside atomizer chamber exists leads to an unsteady spray.",
  address="Institute for Liquid Atomization and Spray Systems - Japan",
  booktitle="Proceedings 10th International Congress on Liquid Atomization and Spray Systems ICLASS-2006",
  chapter="19879",
  edition="1",
  institution="Institute for Liquid Atomization and Spray Systems - Japan",
  year="2006",
  month="august",
  pages="1--8",
  publisher="Institute for Liquid Atomization and Spray Systems - Japan",
  type="conference paper"
}