Publication detail

Droplet dynamics and size characterization of high-velocity airblast atomization

URBÁN, A. ZAREMBA, M. MALÝ, M. JÓZSA, V. JEDELSKÝ, J.

Original Title

Droplet dynamics and size characterization of high-velocity airblast atomization

Type

journal article in Web of Science

Language

English

Original Abstract

Airblast atomizers are especially useful and commonplace in liquid fuel combustion applications. However, the spray formation processes, the droplet dynamics and the final drop size distributions are still not sufficiently understood due to the coupled gas-liquid interactions and turbulence generation. Therefore, empirical and semi-empirical approaches are typically used to estimate the global spray parameters. To develop a physical understanding of the spray evolution, a plain-jet airblast atomizer was investigated in an atmospheric spray rig using the Phase-Doppler technique. The simultaneous drop size and axial and radial velocity components were measured on radial traverses across the spray at various axial distances from the nozzle for a range of atomizing pressures. The droplet turbulent and mean kinetic energies were found to be proportional to the atomizing pressure. Hence, the scatter of the radial motion of the droplets increased with the atomizing pressure. A droplet stability analysis was performed to locate the regions characterized by ongoing secondary atomization. The volume-to-surface diameter, D32, of the fully developed spray was compared with estimates provided by five published formulae. The role of liquid viscosity, hence the Ohnesorge number, was found to be negligible in the investigated regime. Three commonly used size distribution functions were fitted to the measured data to analyze their dependence on the atomizing pressure. The Gamma distribution function was found to give the best approximation to the atomization process.

Keywords

Plain-jet airblast atomizer; Droplet size distribution; Liquid breakup; Phase-Doppler Anemometry; Sauter mean diameter; Spray stability

Authors

URBÁN, A.; ZAREMBA, M.; MALÝ, M.; JÓZSA, V.; JEDELSKÝ, J.

Released

7. 2. 2017

Publisher

Elsevier

ISBN

0301-9322

Periodical

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW

Year of study

95

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

11

Pages count

11

URL

http://www.sciencedirect.com/science/article/pii/S0301932216303093

Full text in the Digital Library

http://hdl.handle.net/11012/138389

BibTex

@article{BUT133072,
  author="András {Urbán} and Matouš {Zaremba} and Milan {Malý} and Viktor {Józsa} and Jan {Jedelský}",
  title="Droplet dynamics and size characterization of high-velocity airblast atomization",
  journal="INTERNATIONAL JOURNAL OF MULTIPHASE FLOW",
  year="2017",
  volume="95",
  number="1",
  pages="1--11",
  doi="10.1016/j.ijmultiphaseflow.2017.02.001",
  issn="0301-9322",
  url="http://www.sciencedirect.com/science/article/pii/S0301932216303093"
}