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Homework_C3

# Homework_C3 - Reading assignments Chapter 2 2.1 2.2 2.3 2.4...

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Reading assignments Chapter 2: 2.1, 2.2, 2.3, 2.4, 2.5. Problem #1: The results from the flow problem of a falling film are only valid for a laminar flow. For the falling film, this flow regime can only obtained if the Reynolds number, defined by 4 Re z u ρ δ µ = is smaller or equal 20. 1. If the film liquid is water at 20 0 C (kinematic viscosity = 0.010037 cm 2 /s), what is the maximum volume flow rate per unit per unit wall width W. 2. For Re = 10, and the wall is vertical, calculate the film thickness. 3. If one wants to choose a different coordinate system as follows: the y and z coordinates are the same, but the x coordinate is: x = 0 at the solid wall, and δ at the gas liquid interface. Show that the velocity is then given by 2 2 cos 1 2 z g x u ρ δ β µ δ δ x = What is your comment on this choice of coordinate system? Problem #2: See 2.4. (Flow in the annulus) in the text book Use the methodology for solving the viscous flow problem in the lecture notes (i.e. lecture

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Homework_C3 - Reading assignments Chapter 2 2.1 2.2 2.3 2.4...

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