
In this thesis we have used a simple, idealized model to study
enhanced mass transport due to convective flow in an incompressible
Newtonian binary fluid and computed the resulting effective
diffusivity under periodic and stochastic velocity fields. We have
developed a generalization of the analysis presented in ref.
\cite{re:Codastefano77} to compute the effective diffusivity and
developed a numerical code to study mass transport in a slot geometry
induced by a non uniform and time dependent velocity field. We have
first tested the numerical code for the purely diffusive case, and
shown that we can recover the value of t he diffusion coefficient with
good accuracy. We first studied the case of a time independent
velocity field, and verified the predictions made in ref.
\cite{re:Garandet97}.
 
And since this is short, I'll remove the rest of the file as well. 

