# Fluid flow problem with the momentum balance equation

1. Sep 20, 2012

### abstracted6

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

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

#### Attached Files:

• ###### 1.4-1, fluid flow.pdf
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2. Sep 21, 2012

### LawrenceC

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

3. Sep 21, 2012

### abstracted6

Ooops

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

4. Sep 21, 2012

### LawrenceC

Looks good to me.

5. Sep 21, 2012

### rude man

Comment: interesting problem; case where change in momentum is vΔm instead of the usual mΔv.