[Jonasd]

Hello, I am currently looking at calculating the force on a jet stream of water that is deflected with a known incoming flow velocity and known outgoing velocity.

If I remember correctly, this can be derived by using Newtons second law.



Which would mean for constant velocity:



Where

However, i get unreasonably large forces. More likely, would be a decrease of the force with about a factor 2. Can anyone see any errors?

Thanks in advance!

Edit: My apologies for the subject line, realized that it has nothing to do with virtual mass