The diameter of an extruder barrel = 85 mm and its length = 2.00 m. the screw rotates at 55 rev/min, its channel depth = 8.0 mm, and its flight angle = 18°. head pressure at the die end of the barrel = 10.0(106) pa. viscosity of the polymer melt = 100 pa- s. find the volume flow rate of plastic at the die end of the barrel.

Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.