  We experimentally investigate particle migration in a non-Brownian suspension
sheared in a Taylor-Couette configuration and in the limit of vanishing
Reynolds number. Highly resolved index-matching techniques are used to measure
the local particulate volume fraction. In this wide-gap Taylor-Couette
configuration, we find that for a large range of bulk volume fraction, $\phi_b
\in [20\% - 50\%]$, the fully developed concentration profiles are well
predicted by the suspension balance model of Nott \& Brady (J. Fluid Mech.,
vol. 275, 1994, pp. 157-199). Moreover, we provide systematic measurements of
the migration strain scale and of the migration amplitude which highlight the
limits of the suspension balance model predictions.
