Pressure-swirl atomizers are often employed to generate a water-mist spray, typically employed in fire suppression. In the present study, an experimental characterization of dispersion (velocity and cone angle) and atomization (drop-size axial evolution) was carried out following a previously developed methodology, with specific reference to the initial region of the spray. Laser-based techniques were used to quantitatively evaluate the considered phenomena: velocity field was reconstructed through a Particle Image Velocimetry analysis; drop-size distribution was measured by a Malvern Spraytec device, highlighting secondary atomization and subsequent coalescence along the spray axis. Moreover, a comprehensive set of relations was validated as predictive of the involved parameters, following an inviscid-fluid approach. The proposed model pertains to early studies on pressure-swirl atomizers and primarily yields to determine both initial velocity and cone angle. The spray thickness is also predicted and a classic correlation for Sauter Mean Diameter is shown to provide good agreement with experimental results. The analysis was carried out at the operative pressure of 80 bar; two injectors were employed featuring different orifice diameters and flow numbers, as a sort of parametric approach to this spray typology. Â© Science Press and Institute of Engineering Thermophysics, CAS and Springer-Verlag Berlin Heidelberg 2012.
Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers / Santangelo, Paolo Emilio. - In: JOURNAL OF THERMAL SCIENCE. - ISSN 1003-2169. - 21:6(2012), pp. 539-548.
|Data di pubblicazione:||2012|
|Titolo:||Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers|
|Autore/i:||Santangelo, Paolo Emilio|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1007/s11630-012-0579-5|
|Codice identificativo ISI:||WOS:000310991800008|
|Codice identificativo Scopus:||2-s2.0-84871729005|
|Citazione:||Experiments and modeling of discharge characteristics in water-mist sprays generated by pressure-swirl atomizers / Santangelo, Paolo Emilio. - In: JOURNAL OF THERMAL SCIENCE. - ISSN 1003-2169. - 21:6(2012), pp. 539-548.|
|Tipologia||Articolo su rivista|
File in questo prodotto:
I documenti presenti in Iris Unimore sono rilasciati con licenza Creative Commons Attribuzione - Non commerciale - Non opere derivate 3.0 Italia, salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris