Articles
ATOMIZATION MODELLING: A EULERIAN APPROACH
Article number
1008_4
Pages
45 – 50
Language
English
Abstract
Reducing pesticide drift requires particularly a better understanding of atomization process.
An Eulerian model was therefore developed to model the atomization of a liquid sheet generated by a hollow cone nozzle.
First, three-dimensional calculations were performed to model the turbulent swirled flow inside the nozzle.
Second, two-dimensional axisymmetric calculations were carried out to model liquid dispersion into the air and to calculate droplet Sauter Mean Diameter and droplet velocity. 3-D calculations were used as boundary conditions for the 2-D calculations.
A fluid with variable density was considered.
Liquid dispersion into air was calculated thanks to a transport equation for the mean liquid mass fraction.
Moreover, a transport equation for the mean liquid/air surface area was developed.
Production of the mean surface area was linked to the mean flow stretching, turbulence and droplet break up effect.
Destruction of the mean surface area was related to droplet coalescence effect.
Combining liquid mass fraction with surface area led indeed to the assessment of a Sauter Mean Diameter all over the calculation domain.
The model was implemented in Fluent 6 Computational Fluid Dynamics software.
Experimental droplet axial velocity and droplet diameter were measured using Phase Doppler Anemometry.
Comparisons between modeling and experimental data showed good agreement.
An Eulerian model was therefore developed to model the atomization of a liquid sheet generated by a hollow cone nozzle.
First, three-dimensional calculations were performed to model the turbulent swirled flow inside the nozzle.
Second, two-dimensional axisymmetric calculations were carried out to model liquid dispersion into the air and to calculate droplet Sauter Mean Diameter and droplet velocity. 3-D calculations were used as boundary conditions for the 2-D calculations.
A fluid with variable density was considered.
Liquid dispersion into air was calculated thanks to a transport equation for the mean liquid mass fraction.
Moreover, a transport equation for the mean liquid/air surface area was developed.
Production of the mean surface area was linked to the mean flow stretching, turbulence and droplet break up effect.
Destruction of the mean surface area was related to droplet coalescence effect.
Combining liquid mass fraction with surface area led indeed to the assessment of a Sauter Mean Diameter all over the calculation domain.
The model was implemented in Fluent 6 Computational Fluid Dynamics software.
Experimental droplet axial velocity and droplet diameter were measured using Phase Doppler Anemometry.
Comparisons between modeling and experimental data showed good agreement.
Authors
A. Vallet, A. Belhadef
Keywords
fluent CFD software, hollow cone nozzle, liquid dispersion, two-phase flow
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