Droplet Streams and Interference Effects
This work investigates the effect of droplet interaction on the
physical transport characteristics during vaporization and
combustion of an infinite stream of droplets.
Analytical transformations are developed so that the solutions
can be sought in a regular domain
and mesh points can be clustered in regions with high gradient.
The transformed equations are discretized, leading to an
algebraic system of equations solved using
scientific routines libraries.
The transformations are then inverted and the profiles within the physical
domain obtained for the quantities of interest.
For the nonreacting case, the
results indicate that the vaporization rate of a droplet in a stream can
be obtained from the isolated droplet vaporization case times a function
depending on the interdroplet distance. For the reacting case, preliminary
results show that this trend is also observed for small droplet spacing, but
a small increase in the mass vaporization rate can be observed for large
spacings, before the individual flames merge into a single one surrounding
The combustion results have been obtained assuming an infinitely fast
reaction rate (flame sheet approximation).
The finite-chemistry case is under investigation.
Leiroz,A.J.K. and Rangel,R.H., "Numerical Study of Droplet-Stream Vaporization
at Zero-Reynolds Number", Numerical Heat Transfer - Part A :
Applications, 27, pp.273-296, 1995.
Leiroz,A.J.K. and Rangel,R.H., "Numerical Grid for Droplet-Stream Vaporization
Problems", Proc. 5th National Thermal Sciences Meeting, ENCIT 94,
Sao Paulo, Brazil, December, 1994.
Leiroz,A.J.K. and Rangel,R.H., "Interaction Effects During Droplet-Stream
Combustion", 8th International Symposium on Transport
Phenomena (ISTP-8) in Combustion , San Francisco, USA, July, 1995.
Leiroz,A.J.K. and Rangel,R.H., "Flame and Droplet Interaction Effects During
Droplet-Stream Combustion at Zero Reynolds Number", submitted for publication
in Combustion & Flame.
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