Direct and inverse pumping in flows with homogeneous and non-homogeneous swirl A. Pothérat, F. Rubiconi, Y. Charles and V. Dousset Eur. Phys. J. E, 36 8 (2013) 94 Published online: 30 August 2013 DOI: 10.1140/epje/i2013-13094-y