Publication detail

Unsteadiness in Effervescent Sprays: a New Evaluation Method and the Influence of Operational Conditions

JEDELSKÝ, J. JÍCHA, M.

Czech title

Nestability v effervescent sprejích: Nová metoda měření, vliv provozních podmínek

English title

Unsteadiness in Effervescent Sprays: a New Evaluation Method and the Influence of Operational Conditions

Type

journal article in Web of Science

Language

en

Original abstract

A new evaluation method of unsteadiness of the spray generated by an effervescent atomizer is presented. The method is based on measurements of pressure fluctuations in the atomizer mixing chamber. Measurements, made under different atomizer operational conditions, show that the spray unsteadiness depends mainly on gas-to-liquid ratio (GLR). Decrease in GLR causes the spray to become more unsteady. The relation between atomizer internal two-phase flow pattern and the spray unsteadiness is elucidated by visualization of the internal two-phase flow using a digital camera and the use of published two-phase flow maps. Findings of the new method are complemented and confronted with the results obtained by the use of the spray unsteadiness evaluation method of Edwards and Marx.

Czech abstract

V příspěvku je odvozena nová metoda měření nestabilit spreje u trysky typu effervescent. Metoda je založena na měření tlakových pulzací ve směšovací komoře trysky. Měření na modelové trysce ukazují vliv provozních podmínek: tlaku a směšovacího poměru plynu a kapaliny. K osvětlení příčin nestabilit je využita vizualizace vnitřního dvoufázového toku pomocí vysokorychlostní kamery. Výsledky měření nestabilit pomocí uvedené metody jsou porovnány s metodou odvozenou Edwardsem and Marxem.

English abstract

A new evaluation method of unsteadiness of the spray generated by an effervescent atomizer is presented. The method is based on measurements of pressure fluctuations in the atomizer mixing chamber. Measurements, made under different atomizer operational conditions, show that the spray unsteadiness depends mainly on gas-to-liquid ratio (GLR). Decrease in GLR causes the spray to become more unsteady. The relation between atomizer internal two-phase flow pattern and the spray unsteadiness is elucidated by visualization of the internal two-phase flow using a digital camera and the use of published two-phase flow maps. Findings of the new method are complemented and confronted with the results obtained by the use of the spray unsteadiness evaluation method of Edwards and Marx.

Keywords in Czech

Nestability spreje, effervescent tryska, metoda měření, dvoufázový tok

Keywords in English

Spray unsteadiness, effervescent atomizer, measurement method, two-phase flow

RIV year

2008

Released

01.01.2008

Publisher

Begell House

Location

Begell House Inc. 50 Cross Highway, Redding, CT 06896

ISSN

1044-5110

Journal

Atomization and sprays

Volume

18

Number

1

Pages from–to

49–83

Pages count

35

BIBTEX


@article{BUT44240,
  author="Jan {Jedelský} and Miroslav {Jícha},
  title="Unsteadiness in Effervescent Sprays: a New Evaluation Method and the Influence of Operational Conditions",
  journal="Atomization and sprays",
  year="2008",
  volume="18",
  number="1",
  month="January",
  pages="49--83",
  publisher="Begell House",
  address="Begell House Inc.
50 Cross Highway,
Redding, CT 06896",
  issn="1044-5110"
}