# HW_C2 - Homework Set #2: Due date: 09/22/06, by 11:00 am....

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Homework Set #2: Due date: 09/22/06, by 11:00 am. Problem #1: In the falling film problem, it is assumed that flow is laminar. This flow regime can only obtained if the Reynolds number, Re, defined by 4 Re z u ρ δ µ = is smaller or equal 10, where z u is the average fluid velocity 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 wall width W to ensure that Re 10. 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 gx u ρδ β µδ x ⎛⎞ ⎛⎞ =− ⎜⎟ ⎜⎟ ⎝⎠ ⎝⎠ Give your comment on this choice of coordinate Problem #2: Solve problem 2A.2 at the end of Chapter 2 of BSL.

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## This note was uploaded on 12/14/2011 for the course PGE 312 taught by Professor Peters during the Spring '08 term at University of Texas at Austin.

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HW_C2 - Homework Set #2: Due date: 09/22/06, by 11:00 am....

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