A wall film model has been implemented in a customized version of KIVA code
developed at University of Bologna. Under the hypothesis of `thin laminar
ow'
the model simulates the dynamics of a liquid wall film generated by impinging
sprays. Particular care has been taken in numerical implementation of the
model.
The major phenomena taken into account in the present model are: wall film
formation by impinging spray; body forces, such as gravity or acceleration of the
wall; shear stress at the interface with the gas and no slip condition on the wall;
momentum contribution and dynamic pressure generated by the tangential and
normal component of the impinging drops; film evaporation by heat exchange
with wall and surrounding gas. The model doesn't consider the effect of the
wavy film motion and suppose that all the impinging droplets adhere to the
film. The governing equations have been integrated in space by using a finite
volume approach with a first order upwind differencing scheme and they have
been integrated in time with a fully explicit method.
The model is validated using two different test cases reproducing PFI gasoline and DI Diesel engine wall film conditions.
| Identifer | oai:union.ndltd.org:unibo.it/oai:amsdottorato.cib.unibo.it:1143 |
| Date | 04 June 2008 |
| Creators | Forte, Claudio <1974> |
| Contributors | Pelloni, Piero |
| Publisher | Alma Mater Studiorum - Università di Bologna |
| Source Sets | Università di Bologna |
| Language | Italian |
| Detected Language | English |
| Type | Doctoral Thesis, PeerReviewed |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess |
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