A concentric pneumatic nebulizer (CPN) and a custom designed flow focusing nebulizer (FFN)
are characterized. As will be shown, the classical Nukiyama-Tanasawa and Rizk-Lefebvre
models lead to erroneous size prediction for the concentric nebulizer under typical operating
conditions due to its specific design, geometry, dimension and different flow regimes. The
models are then modified to improve the agreement with the experimental results. The size
prediction of the modified models together with the spray velocity characterization are used to
determine the overall nebulizer efficiency and also employed as input to a new Maximum
Entropy Principle (MEP) based model to predict joint size-velocity distribution analytically. The
new MEP model is exploited to study the local variation of size-velocity distribution in contrast
to the classical models where MEP is applied globally to the entire spray cross section. As will
be demonstrated, the velocity distribution of the classical MEP models shows poor agreement
with experiments for the cases under study. Modifications to the original MEP modeling are
proposed to overcome this deficiency. In addition, the new joint size-velocity distribution agrees
better with our general understanding of the drag law and yields realistic results. / PhD
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:OTU.1807/26278 |
| Date | 17 February 2011 |
| Creators | Kashani, Arash |
| Contributors | Mostaghimi, Javad, Mechanical and Industrial Engineering |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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