Here you can see, thanks to coloured filaments, the flow induced by a cylindrical MHD accelerator plunged into acidulous water, electrically conductive. A rod magnet generates the axial magnetic field (towards the reader). In this example, it is a permanent magnet (1000 Gauss), thus the MHD efficiency is weak and the flow speed is moderate, but you can see the principle. The Lorentz force field creates a suction of the liquid upstream, and a laminar wake downstream, which is slightly disturbed by bubbles near the anode (gaseous emission from anodic oxidation, cause of electrolysis). Digitized 16mm film, taken by Maurice Viton in 1976.
JP Petit: "The Silence Barrier" (scientific comics about MHD, original version in French)