Vaporization of Binary Droplets
This work is part of a collaboration with
Coordenação de Programas
de Pós-Graduação
em Engenharia (COPPE), Brazil
Abstract
A diffusive liquid vaporization model for
multicomponent droplets has been developed. It includes: spatially and time
dependent density, the interdiffusion term in the energy equation,
variable properties, and non-ideal phase equilibrium. This
model is used to simulate the vaporization of monocomponent
droplets of n-heptane and methanol, and bicomponent droplets of
their mixture. It is shown that density variations induce an internal
convection which, together with the interdiffusion of species,
results in a significant decrease of the droplet lifetime and the energy requirement for
vaporization when compared with the predictions of the more traditional model.
It is also found that the
surface conditions are primarily controlled by phase equilibrium.
The model is able to predict the experimentally-observed sparkle at the end of
droplet combustion.
Recent Publications
-
P. L. C. Lage, C. M. Hackenberg, and R. H. Rangel,
"Non-ideal Vaporization of Dilating Binary Droplets with Variable Properties,"
Int. J. Heat and Mass Transfer, 36, 3731-3741, 1993.
-
P. L. C. Lage, C. M. Hackenberg, and R. H. Rangel,
"Non-ideal Vaporization of Dilating Binary Droplets with Radiation Absorption,"
Combustion and Flame, 101, 36-44, 1995.
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