Publication detail

Energy conversion during effervescent atomization

JEDELSKÝ, J. JÍCHA, M.

Original Title

Energy conversion during effervescent atomization

English Title

Energy conversion during effervescent atomization

Type

journal article in Web of Science

Language

en

Original Abstract

The paper qualitatively describes processes during the internal flow, discharge of two-phase mixture as well as spray formation with a particular focus on the energy transfer during effervescent atomization of light heating oil. The near nozzle spray visualization elucidates the liquid breakup process at different operation modes. Numerical results illustrate the forms of energy involved in the atomization process, their values and the influence of operational conditions on relations between the energy forms. The main part of the paper focuses on the atomization efficiency. A simple method for estimation of the atomization efficiency of pneumatic atomizers is proposed; surface tension energy of created droplets, obtained from phase-Doppler anemometry data, is compared with the energy required for atomization. The atomization efficiency of effervescent atomizers is found to be in fragments of per cents for atomizing pressures ranging between 0.1 and 0.5 MPa, and gas-to-liquid ratios (GLRs) between 0.02 and 0.1, and it is inferior, by about one order of magnitude to the efficiency of simple pressure and pressure-swirl atomizers for a comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.

English abstract

The paper qualitatively describes processes during the internal flow, discharge of two-phase mixture as well as spray formation with a particular focus on the energy transfer during effervescent atomization of light heating oil. The near nozzle spray visualization elucidates the liquid breakup process at different operation modes. Numerical results illustrate the forms of energy involved in the atomization process, their values and the influence of operational conditions on relations between the energy forms. The main part of the paper focuses on the atomization efficiency. A simple method for estimation of the atomization efficiency of pneumatic atomizers is proposed; surface tension energy of created droplets, obtained from phase-Doppler anemometry data, is compared with the energy required for atomization. The atomization efficiency of effervescent atomizers is found to be in fragments of per cents for atomizing pressures ranging between 0.1 and 0.5 MPa, and gas-to-liquid ratios (GLRs) between 0.02 and 0.1, and it is inferior, by about one order of magnitude to the efficiency of simple pressure and pressure-swirl atomizers for a comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.

Keywords

Twin-fluid atomization, Effervescent atomization, Atomization efficiency, Energy conversion, Two-phase flow, SUSPENSION PLASMA SPRAY; TWIN-FLUID ATOMIZATION; 2-PHASE FLOW; ATOMIZER; LIQUID; PERFORMANCE; UNSTEADINESS; REGIMES; BREAKUP; NOZZLE

RIV year

2013

Released

01.09.2013

Publisher

Elsevier

Location

The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England

Pages from

836

Pages to

844

Pages count

9

URL

Full text in the Digital Library

BibTex


@article{BUT104267,
  author="Jan {Jedelský} and Miroslav {Jícha}",
  title="Energy conversion during effervescent atomization",
  annote="The paper qualitatively describes processes during the internal flow, discharge of two-phase mixture as well as spray formation with a particular focus on the energy transfer during effervescent atomization of light heating oil. The near nozzle spray visualization elucidates the liquid breakup process at different operation modes. Numerical results illustrate the forms of energy involved in the atomization process, their values and the influence of operational conditions on relations between the energy forms. The main part of the paper focuses on the atomization efficiency. A simple method for estimation of the atomization efficiency of pneumatic atomizers is proposed; surface tension energy of created droplets, obtained from phase-Doppler anemometry data, is compared with the energy required for atomization. The atomization efficiency of effervescent atomizers is found to be in fragments of per cents for atomizing pressures ranging between 0.1 and 0.5 MPa, and gas-to-liquid ratios (GLRs) between 0.02 and 0.1, and it is inferior, by about one order of magnitude to the efficiency of simple pressure and pressure-swirl atomizers for a comparable droplet size. The efficiency declines with both the pressure and GLR with approximately logarithmic tendency.",
  address="Elsevier",
  chapter="104267",
  doi="10.1016/j.fuel.2013.03.053",
  institution="Elsevier",
  number="1",
  volume="111",
  year="2013",
  month="september",
  pages="836--844",
  publisher="Elsevier",
  type="journal article in Web of Science"
}