A large pipe has an outer diameter Dout= 30 cm. It contains two types of polymers in different layers. T1 = 2mm, T2 = 8mm (as in the graph). These are very thin layers relative to the radius of the pipe, thus can be consider as planar wall. The pipe needs two extruders to supply the two different polymer melts to a piping die. The two fluids flow in the die are divided by a thin metal divider (negligible), and only combined together at the die exit. The flow length inside the die is L = 0.25 m. When the two layers of polymer combine at the exit, they must have the same shear stress.

Known: The inlet pressure to the die for layer A is 4 MPa

Polymer in layer A: melt density 990 kg/m3 and solid density of 1140 kg/m3

Polymer in layer B: melt density 800 kg/m3 and solid density of 945 kg/m3

Determine the flow rate for Layer A and Layer B.

A=50000.2B=80000.6