High-speed lithium flow was demonstrated in free surface condition by using the lithium loop facility at Osaka University. The project aims at the verification of hydrodynamic stability of free surface lithium flow of up to 15 m/s. A horizontally aligned test channel was installed in the existing loop. Preliminary results show that the design of the nozzle and of the test channel is considered to be successful in order to realize a high-speed free surface flow of lithium in vacuum. (C) 2003 Elsevier B.V. All rights reserved.