Abstract: The dynamics of vortex flow in confined geometries can be explored with tailored weak-pinning channels of superconducting a-NbGe surrounded by strong-pinning NbN channel edges. The lack of pinning allows the vortices to move through the channels with the dominant interaction determined by the shape of the channel walls. We have fabricated such weak-pinning channels with asymmetric sawtooth edges for controlling the motion of vortices. I will present our measurements of substantial asymmetries in the vortex dynamics in these channels, characteristic of a ratchet, and compare these with similar measurements on a set of channels with uniform width. We have also studied vortices flowing in circular channels arranged in a Corbino disk geometry. We have developed a SQUID voltmeter arrangement for resolving the flux flow voltage from a small number of vortices moving through such a single circular mesoscopic channel free from edge barriers.