Abstract: In this work, the flow characteristics of the liquid GaInSn film in the multilayer channel in the organic glass cavity under the spanwise magnetic field are studied. Three laser level instruments are used to simultaneously capture the liquid 2D contour changes at three positions, and measure the thickness of film. The experimental results show that the surface fluctuation of the liquid film increases obviously with Reynolds number in the organic glass channel. The magnetic field effectively inhibits the surface fluctuation along the magnetic lines, but has little influence on the surface fluctuation along the streamwise direction. The thickness of the film decreases with the increase of the magnetic field at small Reynolds numbers, the thickness decreases first and then increases at the medium Reynolds numbers, and the thickness of film increases monotonically when Reynolds numbers are large. The larger Reynolds number is, the more obvious the effect of magnetic field's obstruction of the flow is. The results illustrate that the multilayer film flow device effectively improves the spreading of film flow and makes the spreading easier.

Key words: magnetic field, liquid metal, film flow, multilayer channel