Question

A fluid of dynamic viscosity 2 105 kg/m.S and density 1 kg/m3 flows with an average velocity of 1 m/s through a long duct of rectangular (25 mm 15 mm) cross-section. Assuming laminar flow, the pressure drop (in pa) in the fully developed region per meter length of the duct is _

Answer 1

Let us suppose that the fluid is flowing over a flat surface in laminated layers from left to right as balancing forces on one layer (assumed 1 m wide) we get the following. dL  Oil of density 860 kg/m3 has a kinematic viscosity of 40 cSt. Determine the pressure drop per metre length, the average velocity and the radius at.