Calculating Shear Stress on Parallel Plates at 15 deg C

[falcon0311]

So I've got this velocity distribution for laminar flow between parallel plates.

\frac{u}{u_{max}} = 1 - (\frac{2y}{h})^2

h is the distance between the plates with the origin placed midway between the plates. I'm assuming this is for water flowing at 15 deg C with u_{max} = 0.10 m/s and h = 0.25 mm.

I'm supposed to calculate the shear stress on the upper plate and give its direction. I'm trying to figure out how to incorporate these into

\tau_{yx} = \mu \frac{du}{dy} at 15 deg C, \mu = 1.14*10^{-3} N*s/m^2 I also know the temperature has to be in Kelvin (288.15K in this case). Anyone willing to give me a push?

 

[falcon0311]

I've got it figured out. -1.82 N/m^2 = \tau_{yx}

 

[jaap de vries]

seems correct