- #1

hamurabi

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## Homework Statement

The velocity distribution for laminar flow between parallel plates is given by

u/umax = 1-(2y/h)2

where h is the distance separating the plates and the origin is placed midway between the plates.

Consider flow of water at 15 0C with maximum speed of umax=0.05 m/s and h=5 mm. Calculate the

force on a 0.3 m2 section of the lower plate and give its direction.

## Homework Equations

Given in the problem and perhaps P = F/A

## The Attempt at a Solution

Well I know that the maximum velocity will occur at the origin i.e y=0 and that the velocity at the plates is zero. So the maximal force would occur also at the origin - Would I have to get the y-component of the velocity?

I am guessing that the temperature is given so that we can get density (0.999) and viscosity (1.78 cp) from tables - or this may just be a red herring

Now the thing I am having problems with is linking the velocity with an equation to get pressure so that I can calculate the force.

Any guidance would be much appreciated!