Calculating Vena Contracta K Factor: Inlet and Outlet Pressure Difference Method

[Physicist3]

To calculate the K factor for a contraction, do you find the inlet pressure and outlet pressure and then find the difference, then divide the pressure difference by rho x gravity to find the value of h and then rearrange h = K (V²/2g) to find K because I am unsure otherwise?

 

[andrien]

What else one can do?

 

[Physicist3]

Cheers. Am i right in thinking the pressure difference between the actual pressure drop and ideal pressure drop should be used to find h for use in the eqtn?

 

[andrien]

http://books.google.co.in/books?id=atorfhXblZ4C&pg=PA119&dq=vena+contracta&hl=en#v=onepage&q=vena%20contracta&f=false