  Tubeless siphon flow of liquid metal was made possible by way of sucking the
fluid via a syringe pump with a rubber tube. Through adjusting the flow rate
and tube diameter, the liquid column height and diameter can be changed
accordingly. A theoretical model was derived to predict the flow configuration
thus enabled. Adding micro copper particles evidently increased the extensional
viscosity of liquid metal. With the increase of particle concentration, the
enhancement of tubeless siphon becomes more remarkable. The intermetallic
compound CuGa2 produced by corrosion was considered as the reason for the
variation of rheological property of liquid metal.
