Meanwhile, the new two parameters of surface cover ratio and rivulet flow index are introduced to characterize the flowing characteristic of the full-cover free surface flow under magnetic field. After compared and analyzed the characteristic parameters of the free surface flow, the conditions of full-cover free surface flow are found. The superficial layer MHD effect in free surface flow is experimentally observed. Recently, after we carried out a guidable free curve-surface flow on theoretically and experimentally, seeking for other way to get a full-cover free surface flow is also in implementing. Up to now, no a real full-cover liquid metal (LM) free surface flow have been successfully used in magnetic fusion devices as MHD instability and unavoidable rivulet flow. Received 5 December 2013 revised 2 February 2014 accepted 21 February 2014

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