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Pressure drop in half pipe coils

Pressure drop in half pipe coils

Pressure drop in half pipe coils

(OP)
I am looking for a method to calculate the pressure drop in half pipe coils like the ones used as heat transfer jackets.

See my posting in Piping and fluid mechanics.
I would link the thread but I can't seem to figure that out.


Thanks

StoneCold

RE: Pressure drop in half pipe coils


One has to estimate the hydraulic diameter and the friction factor.

The hydraulic diameter,

Dh = 4(fluid flow cross section) / wetted perimeter

The friction factor, from literature,

f = 0.076 Re-0.25 + 0.0073(Dh/Dc)0.5 ± 10%

valid for 0.34<Re(Dh/Dc)2<300, where Dc is the coil diameter.   

The friction drop is estimated from:

ΔPf≈ 4 f ρ (L/Dh) (V2/2)

where ρ is the liquid density; V, the linear velocity; Re, the Reynolds number; L, the coil length.

RE: Pressure drop in half pipe coils

(OP)
Thanks 25362

Best Regards
StoneCold

RE: Pressure drop in half pipe coils

Stone....

I have always used a pipe with an inside "wetted perimeter" equvalent to that of the half-pipe. Then I have used the calculated half-pipe lengthe and treated this as a piping problem.

There are tables/methods available for piping pressure drop...

How much of a difference in calculated pressure drop will this make ?

-MJC

  

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