Publication detail

Drop Size Distribution in Effervescent Sprays: An Experimental study Using PDA Technique

BROUKAL, J. HÁJEK, J. SOJKA, P. JUŘENA, T.

Original Title

Drop Size Distribution in Effervescent Sprays: An Experimental study Using PDA Technique

English Title

Drop Size Distribution in Effervescent Sprays: An Experimental study Using PDA Technique

Type

conference paper

Language

en

Original Abstract

Although effervescent atomizers (twin fluid atomizers with internal mixing) represent one of the most recent atomization techniques, they have already shown great usability especially in combustion applications. Due to their different drop formation mechanism they are able to produce smaller droplets than many other conventional atomizers at similar operating conditions, thus making the combustion process more efficient. However, one of the shortcomings of effervescent atomization is the complexity of the atomization mechanism, which involves a two-phase flow. This complexity presents a challenging obstacle when trying to devise computational models describing effervescent sprays. In the past few years many various models have been proposed, but their verification and validation often relies only on very limited data, such as only few representative diameters or global drop size distribution. The purpose of this paper is to review the previous experimental studies on effervescent atomization in order to identify areas that need to be more deeply investigated. The parameters that need more detailed analysis include especially radially (or angularly) and axially dependent representative drop diameters or drop distributions and mass fluxes. It is shown that previous measurements did not collect sufficient amount of data across the whole spectrum of drop sizes and thus parts of the previously measured spectra might be unreliable. A methodology for effervescent spray measurement for verification and validation of numerical models for combustion applications is suggested. Preliminary results are shown indicating the importance of appropriate mask choice.

English abstract

Although effervescent atomizers (twin fluid atomizers with internal mixing) represent one of the most recent atomization techniques, they have already shown great usability especially in combustion applications. Due to their different drop formation mechanism they are able to produce smaller droplets than many other conventional atomizers at similar operating conditions, thus making the combustion process more efficient. However, one of the shortcomings of effervescent atomization is the complexity of the atomization mechanism, which involves a two-phase flow. This complexity presents a challenging obstacle when trying to devise computational models describing effervescent sprays. In the past few years many various models have been proposed, but their verification and validation often relies only on very limited data, such as only few representative diameters or global drop size distribution. The purpose of this paper is to review the previous experimental studies on effervescent atomization in order to identify areas that need to be more deeply investigated. The parameters that need more detailed analysis include especially radially (or angularly) and axially dependent representative drop diameters or drop distributions and mass fluxes. It is shown that previous measurements did not collect sufficient amount of data across the whole spectrum of drop sizes and thus parts of the previously measured spectra might be unreliable. A methodology for effervescent spray measurement for verification and validation of numerical models for combustion applications is suggested. Preliminary results are shown indicating the importance of appropriate mask choice.

Keywords

effervescent spray, drop size distribution, experiment, PDA

RIV year

2013

Released

01.06.2013

Publisher

Congrex Sweden AB/Informationsbolaget Nyberg & Co.

Location

Lund, Sweden

ISBN

978-91-637-2150-2

Book

Abstract Book, 6th European Combustion Meeting, Lund, Sweden, June 25-28, 2013

Pages from

1

Pages to

6

Pages count

6

Documents

BibTex


@inproceedings{BUT101156,
  author="Jakub {Broukal} and Jiří {Hájek} and Paul {Sojka} and Tomáš {Juřena}",
  title="Drop Size Distribution in Effervescent Sprays: An Experimental study Using PDA Technique",
  annote="Although effervescent atomizers (twin fluid atomizers with internal mixing) represent one of the most recent atomization techniques, they have already shown great usability especially in combustion applications. Due to their different drop formation mechanism they are able to produce smaller droplets than many other conventional atomizers at similar operating conditions, thus making the combustion process more efficient. However, one of the shortcomings of effervescent atomization is the complexity of the atomization mechanism, which involves a two-phase flow. This complexity presents a challenging obstacle when trying to devise computational models describing effervescent sprays. In the past few years many various models have been proposed, but their verification and validation often relies only on very limited data, such as only few representative diameters or global drop size distribution. The purpose of this paper is to review the previous experimental studies on effervescent atomization in order to identify areas that need to be more deeply investigated. The parameters that need more detailed analysis include especially radially (or angularly) and axially dependent representative drop diameters or drop distributions and mass fluxes. It is shown that previous measurements did not collect sufficient amount of data across the whole spectrum of drop sizes and thus parts of the previously measured spectra might be unreliable. A methodology for effervescent spray measurement for verification and validation of numerical models for combustion applications is suggested. Preliminary results are shown indicating the importance of appropriate mask choice.",
  address="Congrex Sweden AB/Informationsbolaget Nyberg & Co.",
  booktitle="Abstract Book, 6th European Combustion Meeting, Lund, Sweden, June 25-28, 2013",
  chapter="101156",
  howpublished="electronic, physical medium",
  institution="Congrex Sweden AB/Informationsbolaget Nyberg & Co.",
  year="2013",
  month="june",
  pages="1--6",
  publisher="Congrex Sweden AB/Informationsbolaget Nyberg & Co.",
  type="conference paper"
}