Consider a system where a horizontal, laminar, separated flow of air and water at 100 kPa pressure and 20˚C temperature are moving between two infinitely-sized parallel plates. The water flow is not forced, but is carried along by the air flow. The ‘superficial velocity’ of the air is 0.1 m/s (superficial velocity is volume flow rate / flow area, representing the average velocity of the flow). The depth of the water film is 2 mm and the thickness of the air layer is 5 mm.

Use the multiphase balance equations and interfacial boundary conditions to derive the velocity profile in the air and water, with y=0 being the interface between the two.r

Can someone show provide me the givens, properties, assumptions, equations, and sketches that were used to motivate your answer.