Mass and momentum transfers were studied in the cases of two types of annular rotating flows : the Couette-Poiseuille vortex flow, where axial flow is associated with the rotation of the inner cylinder of the annulus, and the swirling decaying flow which is induced by tangential inlets. An electrochemical method was used. For both configurations, mass transfer rates were analyzed in relation with flow structure, which is studied by local measurements with microelectrodes. For the Couette-Poiseuille vortex flows, the experimental variations of Sherwood number as function of Reynolds number and of Taylor number were determined for three intercylinder gap widths. For the swirling decaying flows, wall to liquid mass transfer coefficients were studied as function of the Reynolds number, the axial distance from the entrance to characterize the swirl decay and geometric factors, in particular the ratio of the annulus thickness to the inlet diameter. For vortex and swirl flows, empirical mass transfer correlations are proposed, they take into account the aforementioned parameters and the different flow regimes.