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Pressure drop across pipe's annulus in Solidworks

Pressure drop across pipe's annulus in Solidworks

Pressure drop across pipe's annulus in Solidworks

(OP)
Hi all,

I am trying to find out what pressure drop I get when I pump a fluid through annulus of one pipe that is placed (concentrically) inside another pipe.

Both of the pipes have a length of 20 ft, difference in radius equals 0,225 in and I pump a fluid against gravity.

When I run the first simulation with a slurry, with a density of 1,60 sg and pumping pressure of 1.000 psi I got reasonable results of around 500 psi pressure drop across the pipe.

However, when I tried to run a simulation with the same boundary conditions, with incompressible water with density of 1,0 sg I got an extreme pressure drop of around 950 psi.

Therefore I got 2 questions:
- What is the reason that I get larger pressure drop with 1,0 sg water than with 1,6 sg slurry?
- Why the solver shows that I was pumping with a pressure of 1.006 psi if my inlet pressure opening was set to 1.000 psi (total pressure)?

Appreciate all the help!

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