Calculating Pressure Difference Between Sections 1 and 2

[timothy1875]

Trying to calculate pressure difference between sections 1 and 2.
1=32mm 2=20mm
density = 1000 kg/m^3

I have done P1-P2 = 1/2 density x (vi^2 - vj^2)

Is this right?

How do I now find head loss if difference between 1 and 2 were 45mm ?

45/density x gravity ?

Thanks,

 

[edgepflow]

Your equation for P1 - P2 looks OK (in the absence of friction and assuming the discharge coefficient = 1).

The relation between static pressure difference and fluid column height ("head loss") is:

P2 - P1 = density X g X h1 - h2. Is your head loss 45 mm or was that just an example?

 

[timothy1875]

Ye 45mm is the head loss but it's theoretical and not related to the initial equation. Would the formula be h1 - h2 = p2 - p1 / density x g ?

Thanks for your help

 

[edgepflow]

Ye 45mm is the head loss but it's theoretical and not related to the initial equation. Would the formula be h1 - h2 = p2 - p1 / density x g ?

Thanks for your help

Yes.