Head Loss Due to Pipe Exit Against a Flat Plate
Head Loss Due to Pipe Exit Against a Flat Plate
(OP)
I am currently working through a problem that I am not sure I can answer without trial and error. The problem:
A tank nozzle has a 90 degree bend on the inside of a tank. Flow is coming into the tank, through the nozzle and bend. The bend is ~3 inches from the tank floor. I am trying to find the associated pressure drop due to the close proximity of the bend discharge and tank floor. Additionally, since the exact distance from the tank floor to the exit of the bend is unknown, I would like to put together a chart showing pressure drop vs distance from floor.
I was thinking that I could calculate a CV factor, but I can only do that if I know the pressure drop. Any thoughts on this? Thanks
A tank nozzle has a 90 degree bend on the inside of a tank. Flow is coming into the tank, through the nozzle and bend. The bend is ~3 inches from the tank floor. I am trying to find the associated pressure drop due to the close proximity of the bend discharge and tank floor. Additionally, since the exact distance from the tank floor to the exit of the bend is unknown, I would like to put together a chart showing pressure drop vs distance from floor.
I was thinking that I could calculate a CV factor, but I can only do that if I know the pressure drop. Any thoughts on this? Thanks





RE: Head Loss Due to Pipe Exit Against a Flat Plate
RE: Head Loss Due to Pipe Exit Against a Flat Plate
Sometimes its possible to do all the right things and still get bad results
RE: Head Loss Due to Pipe Exit Against a Flat Plate
Head loss is responsible for the acceleration of the fluid from zero inside the tank to whatever velocity you reach in the vena contracta within the nozzle area.
RE: Head Loss Due to Pipe Exit Against a Flat Plate
Use the Bernoulli equation to determine the energy based on velocity. The "stagnation pressure" is equal in the tank and pipe. Stagnation pressure is defined to be what you would get if you took the pressure and kinetic terms in the Bernoulli formula and calculated the pressure that would give the same total value all by itself (i.e., if velocity were zero). This is higher than the fluid's actual pressure, due to the effect of fluid velocity entering into the tank and coming to a stop.
If you look at the sketch below, the kinetic energy is shown as v2/2g.
RE: Head Loss Due to Pipe Exit Against a Flat Plate
I don't know if this will work but give it a try.
RE: Head Loss Due to Pipe Exit Against a Flat Plate
PennPiper - Didn't want to ignore you, the incoming line is 4.5" OD.