Question

Q=> Fluid mechanics question.

Water flows in a horizontal rectangular channel. The water depth is 0.3 m and the flow speed is 0.5 m/s uniformly over the depth. Then the flow passes over a smooth bump on the channel floor and it is observed that the water depth above the peak of the bump is 0.25 m. Neglecting friction, calculate the height of the bump.

Answer 1

These questions fit better at the Physics section.

Answer 2

Yeah, you might need to factor in Reynold's numbers or something.

Answer 3

It is asking for the height so i guess you use bernoulli's equation?

Answer 4

That should be fine in this situation. I think you can assume laminar flow.

Answer 5

so z1=0.3 z2=0.25 v1=0.5 not use about v2?

Answer 6

since it is horizontal are the velocitys the same?

Answer 7

It says that the velocity is uniform, so I think you can make that assumption.

Answer 8

ok lm working on it

Answer 9

so are we trying to work out the head loss as the values of z1 and z2 are given?

Answer 10

I think so. You might have to do it in stages. There is a before the bump, bump, then after the bump stage.

Answer 11

i will draw a diagram.