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Development of a Model for the Wall Film Formed by Impinging Spray Based on a Fully Explicit Integration Method
Technical Paper
2005-24-087
ISSN: 0148-7191, e-ISSN: 2688-3627
Sector:
Language:
English
Abstract
A wall film model has been implemented in a customized version
of KIVA-3 code developed at University of Bologna. Under the
hypothesis of `thin laminar flow' 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.