Publication detail

Empirical correlation for spray half cone angle in plain-jet airblast atomizers

ÚRBÁN, Á KATONA, B MALÝ, M. JEDELSKÝ, J. JÓZSA, V.

Original Title

Empirical correlation for spray half cone angle in plain-jet airblast atomizers

Type

journal article in Web of Science

Language

English

Original Abstract

Plain-jet airblast atomizers are widely used in industrial applications. The literature contains numerous papers on Sauter mean diameter, however, there is no estimation method available for spray cone angle, SCA, which derivation is the primary goal of this study. Four distinct, practical model liquids were analyzed: distilled water, diesel oil, light heating oil, and crude rapeseed oil. The atomizing pressure and liquid preheating temperature were varied in the range of 0.3–2.4 bar and 25–85 °C, respectively. This latter parameter enabled a wide and continuous liquid kinematic viscosity investigation range of 0.33–44.2 mm2/s. The resulting sprays were imaged at various shutter speeds for proper edge detection. An adaptive thresholding algorithm was developed in Matlab software environment to calculate SCA. The methodology is discussed in detail to facilitate the re-implementation of this technique since there is no generally accepted method for SCA measurement. SCA inversely varied with liquid density and followed a power law with the air-to-liquid mass flow ratio; however, the derived expression also performed well by replacing air-to-liquid mass flow ratio by either Mach number or momentum flux ratio. A simple empirical equation was derived, which allows the estimation of SCA of airblast atomization in a wide parameter range within a 3.5% deviation. The measured results were evaluated in the light of high-speed camera images in the vicinity of the nozzle; it was found that increased liquid jet breakup length decreases SCA while intense ligament formation increases it.

Keywords

Airblast; Rapeseed oil; Spray cone angle; Image processing; Threshold; Atomization

Authors

ÚRBÁN, Á; KATONA, B; MALÝ, M.; JEDELSKÝ, J.; JÓZSA, V.

Released

1. 10. 2020

Publisher

Elsevier

ISBN

0016-2361

Periodical

FUEL

Year of study

277

Number

1

State

United Kingdom of Great Britain and Northern Ireland

Pages from

1

Pages to

11

Pages count

11

URL

https://www.sciencedirect.com/science/article/pii/S0016236120311935

Full text in the Digital Library

http://hdl.handle.net/11012/193502

BibTex

@article{BUT164203,
  author="András {Urbán} and Bálint {Katona} and Milan {Malý} and Jan {Jedelský} and Viktor {Józsa}",
  title="Empirical correlation for spray half cone angle in plain-jet airblast atomizers",
  journal="FUEL",
  year="2020",
  volume="277",
  number="1",
  pages="1--11",
  doi="10.1016/j.fuel.2020.118197",
  issn="0016-2361",
  url="https://www.sciencedirect.com/science/article/pii/S0016236120311935"
}