Publication detail

Energy Conversion in Effervescent Atomization

JEDELSKÝ, J. JÍCHA, M.

Original Title

Energy Conversion in Effervescent Atomization

English Title

Energy Conversion in Effervescent Atomization

Type

conference paper

Language

en

Original Abstract

Atomization of liquids is, from energy point of view, a process of transformation of an input fluid energy in-to surface energy of produced droplets. We qualitatively describe processes during internal flow, discharge of two-phase mixture as well as spray formation with particular focus to the energy transfer in effervescent atomi-zation. Near nozzle spray visualization elucidates the liquid breakup at different operation modes. General ener-gy equation for steady homogeneous flow is used to explain the energy forms involved in the atomization pro-cess. Numerical results illustrate their values and an influence of operational conditions on relations between different energy forms. Main part of the paper is focused on the atomization efficiency. Simple method for esti-mation of the atomization efficiency of pneumatic atomizers is proposed; surface energy of created droplets, estimated using PDA data, is compared with energy required for the atomization. Atomization efficiency of effervescent atomizers is found to be in fragments of per cents for common operation pressures and gas-to-liquid-ratios (GLRs) and it is inferior by about one order to the efficiency of simple pressure and pressure-swirl atomiz-ers for comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.

English abstract

Atomization of liquids is, from energy point of view, a process of transformation of an input fluid energy in-to surface energy of produced droplets. We qualitatively describe processes during internal flow, discharge of two-phase mixture as well as spray formation with particular focus to the energy transfer in effervescent atomi-zation. Near nozzle spray visualization elucidates the liquid breakup at different operation modes. General ener-gy equation for steady homogeneous flow is used to explain the energy forms involved in the atomization pro-cess. Numerical results illustrate their values and an influence of operational conditions on relations between different energy forms. Main part of the paper is focused on the atomization efficiency. Simple method for esti-mation of the atomization efficiency of pneumatic atomizers is proposed; surface energy of created droplets, estimated using PDA data, is compared with energy required for the atomization. Atomization efficiency of effervescent atomizers is found to be in fragments of per cents for common operation pressures and gas-to-liquid-ratios (GLRs) and it is inferior by about one order to the efficiency of simple pressure and pressure-swirl atomiz-ers for comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.

Keywords

Energy Conversion, Effervescent Atomization, PDA, liquid break-up

RIV year

2012

Released

02.09.2012

Publisher

Heidelberg University

Location

Heidelberg, Germany

ISBN

978-88-903712-1-9

Book

proceedings of 12th International Conference on Liquid Atomization and Spray Systems

Pages from

1

Pages to

8

Pages count

8

BibTex


@inproceedings{BUT93803,
  author="Jan {Jedelský} and Miroslav {Jícha}",
  title="Energy Conversion in Effervescent Atomization",
  annote="Atomization of liquids is, from energy point of view, a process of transformation of an input fluid energy in-to surface energy of produced droplets. We qualitatively describe processes during internal flow, discharge of two-phase mixture as well as spray formation with particular focus to the energy transfer in effervescent atomi-zation. Near nozzle spray visualization elucidates the liquid breakup at different operation modes. General ener-gy equation for steady homogeneous flow is used to explain the energy forms involved in the atomization pro-cess. Numerical results illustrate their values and an influence of operational conditions on relations between different energy forms. Main part of the paper is focused on the atomization efficiency. Simple method for esti-mation of the atomization efficiency of pneumatic atomizers is proposed; surface energy of created droplets, estimated using PDA data, is compared with energy required for the atomization. Atomization efficiency of effervescent atomizers is found to be in fragments of per cents for common operation pressures and gas-to-liquid-ratios (GLRs) and it is inferior by about one order to the efficiency of simple pressure and pressure-swirl atomiz-ers for comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.",
  address="Heidelberg University",
  booktitle="proceedings of 12th International Conference on Liquid Atomization and Spray Systems",
  chapter="93803",
  howpublished="electronic, physical medium",
  institution="Heidelberg University",
  year="2012",
  month="september",
  pages="1--8",
  publisher="Heidelberg University",
  type="conference paper"
}