# Fluid flow problem with the momentum balance equation

All problem info, and my work is done in the attached pdf.

Basically, I'm not sure that I have done it correctly.

#### Attachments

• 1.4-1, fluid flow.pdf
428.5 KB · Views: 197

## Answers and Replies

What is the formula for the area of a circle in terms of diameter?

Ooops

So the answer is then:

Fp = -$\rho$vj2$\frac{\pi}{4}$(D12 - D22)

Looks good to me.

rude man
Homework Helper
Gold Member
Comment: interesting problem; case where change in momentum is vΔm instead of the usual mΔv.