Dissolution of a porous medium creates, under certain conditions, some highly conductive
channels called wormholes. The mechanism of propagation is an unstable
phenomenon depending on the microscopic properties at the pore scale and is controlled
by the injection rate. The aim of this work is to test the ability of a Darcy-scale
model to describe the different dissolution regimes and to characterize the influence
of the flow parameters on the wormhole development. The numerical approach is
validated by model experiments reflecting dissolution processes occurring during acid
injection in limestone. Flow and transport macroscopic equations are written under
the assumption of local mass non-equilibrium. The coupled system of equations is
solved numerically in two dimensions using a finite volume method. Results are
discussed in terms of wormhole propagation rate and pore volume injected.