先进材料疑固实验室 Viscosity of liquid metal Laboratory of Advanced Materials Solidification Dynamic(Shear)viscosity The dynamic(shear)viscosity of a fluid expresses its resistance to shearing flows,where adjacent layers move parallel to each other with different speeds. If the speed of the top plate is small enough,the y dimension fluid particles will move faster than the one just boundary plate below it,and friction between them will give rise to (2D,moving) velocity,u a force resisting their relative motion. shear stress,t F()=nA警 (1) fluid gradient, n is dynamic viscosity of the liquid,A is the area of the liquid where the shear force is applied,vx is boundary plate(2D,stationary) velocity of liquid along the x direction. 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYViscosity of liquid metal Dynamic (Shear) viscosity The dynamic (shear) viscosity of a fluid expresses its resistance to shearing flows, where adjacent layers move parallel to each other with different speeds. If the speed of the top plate is small enough, the fluid particles will move faster than the one just below it, and friction between them will give rise to a force resisting their relative motion