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Droplet size and velocity characteristics of water-air impinging jet atomizer.

Authors :
Xia, Y.
Khezzar, L.
Alshehhi, M.
Hardalupas, Y.
Source :
International Journal of Multiphase Flow. Sep2017, Vol. 94, p31-43. 13p.
Publication Year :
2017

Abstract

A water-air impinging jets atomizer is investigated in this study, which consists of flow visualization using high speed photography and mean droplet size and velocity distribution measurements of the spray using Phase Doppler Anemometry (PDA). Topological structures and break up details of the generated spray in the far and near fields are presented with and without air jet and for an impinging angle of 90°. Spray angle increases with the water jet velocity, air flow rate and impinging angle. PDA results indicate that droplet size is smallest in the spray center, with minimum value of Sauter mean diameter (SMD) of 50 µm at the air flow rate of Q m = 13.50 g/min. SMD of droplets increases towards the spray outer region gradually to about 120 µm. The mean droplet velocity component W along the air-jet axis is highest in the spray center and decreases gradually with increasing distance from the spray center. SMD normalized by the air nozzle diameter is found firstly to decrease with gas-to-liquid mass ratio (GLR) and air-to-liquid momentum ratio (ALMR) and then remain almost constant. Its increasing with aerodynamic Weber number indicates an exponential variation. The study sheds light on the performance of water-air impinging jets atomizers providing useful information for future CFD simulation works. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
03019322
Volume :
94
Database :
Academic Search Index
Journal :
International Journal of Multiphase Flow
Publication Type :
Academic Journal
Accession number :
123594002
Full Text :
https://doi.org/10.1016/j.ijmultiphaseflow.2017.04.014