Explanation

Also known as traction current, downstream flow flow is a flow mode formed by shearing of fluid during polymer processing. drag flow refers to the flow generated by the fluid moving together with the moving boundary due to the viscous effect without applying pressure to the fluid. In the process of drag flow, due to the viscous resistance between the fluid layers and the frictional force at the boundary I of the moving edge, there is a velocity difference in the flow direction between adjacent liquid layers of the fluid, which forms a velocity gradient perpendicular to the flow direction. drag flow can be generated in extrusion molding of polymer (screw is the moving boundary), wire and cable cladding molding (metal wire is the moving boundary), and double roll mixing (double roll is the moving boundary) and other molding processes.

Classification