2) For Bingham fluid in a falling film. [tex]\tau[/tex]0. a) Find the equation for [tex]\tau[/tex]xz as a function of x using a shell balance. b) Solve for the minimum thickness of film that will allow flow of this Bingham fluid using the equation for a Bingham fluid and the correct boundary conditions. c) Solve this equation for vz as a function of x for a fluid whose thickness is greater than the minimum. d) Solve for the volumetric rate of flow Q. --- For part a, we know the shell balance is exactly the same for a Newtonian or non-Newtonian fluid so. So the equation is τxz = ρ g x cos β I'm having trouble with the rest of the questions. For part b we use the no slip boundary conditions but I don't know how to solve it for a bingham model. Can anyone help me out? Thanks in advance.