Study On Liquid Bridge Evolution Characteristics Of Spherical Particles In Relative Motion

The solid bulk cargo of nickel and iron ore is affected by wet rain and other factors before shipping,and has certain moisture before shipping.These fine granular solid bulk cargo has a "vibrating density" effect due to extrusion,vibration,self-inertia and other effects,and the internal moisture migration occurs,and the free liquid surface or dense mud is formed on the surface,which means fluidization.The complex slippage characteristics of solid bulk cargo after fluidization may lead to the decrease of ship stability and the possibility of overturning.Water transport is accompanied by the whole fluidization process of bulk cargo,and the water in bulk cargo mainly exists in the form of liquid bridge,which is bound to be affected by dynamic evolution.At present,the phenomenon of water transfer in the fluidization of solid bulk cargo can not be accurately captured from the perspective of macroscopic experiment.From the point of view of liquid bridge,this paper mainly studies the tensile,fracture and water transport behavior of liquid bridge between spherical particles by theoretical analysis and numerical methods.Firstly,based on the investigation of the present research situation at home and abroad,the research goal of analyzing the dynamic evolution of liquid bridge between particles is determined.The tensile fracture characteristics of liquid bridge between two spheres are analyzed by using theoretical equations.The relations between liquid bridge force and particle spacing,volume of liquid bridge and solid-liquid contact angle are obtained.The region of formation,fracture and disappearance of liquid bridge are determined.Then,static and dynamic liquid bridging forces were studied based on CFD method.The effects of stretching velocity,liquid bridging volume,solid-liquid contact angle and particle size ratio on the fracture behavior were obtained.Finally,the stability of the pendulum bridge between three particles and the evolution of the liquid bridge during the relative movement of the particles are analyzed,and the water migration behavior is explained from a microscopic perspective.