# Fluids trouble

1. Sep 11, 2005

### 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?

Last edited: Sep 11, 2005
2. Sep 11, 2005

### falcon0311

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

3. Sep 25, 2005

### jaap de vries

seems correct