Headloss due to single tube

[Jkaen]

Greetings all,

I am trying to calculate the headloss resulting from a single tube (about 1" for example) when placed into a larger diameter water pipe (24" for example). I can find equations for tube banks in literature but all state they are not valid for single tubes, can anybody point me in the right direction please?

 

[cvg]

I would guess that depending on the size of the tube, thickness of the tube walls, end conditions of the tube and mounting position in the larger pipe (ie in the center, along the edge, midway) and also on the velocity and viscosity of the fluid, that you would get a whole range of friction losses. Sounds like a research project - I doubt you will find this equation. If this is important, I would set up a test model and obtain the data.

 

[hydrae]

jkaen

I assume the 1" tube is crosswise in the flow of water in the 24" then:
you could model the 1" tube as an object moving in the water (as apposed the the water moving around the object) to determine the resistance to movement using the same equations (adjusted) to measure friction factors for airplanes, cars, and submarines. That calculated force can then be used to figure the pressure drop due to the tube, this only works as long as the big pipe is significantly larger than the small pipe

If the 1" is parrallel to the 24" (inside lengthwise) then use equations for non circular pipes which use an equivelant pipe diameter (which would be a number slightly smaller than 24&quot

Hydrae