Oil heat transfer with a low flow speed

[gbenefice]

Hello,
I would like to evaluate the wall heat transfer for a low oil flow speed (0.001m/s) with a high pressure (15bar) in a thin pipe (diameter = 0.002m)
Code_Saturne can realize simulations with the following configuration:
- Pipe diameter = 2 mm
- Pipe length > 0.5 m
- Oil density = 885 kg/m3
- Oil dynamic viscosity = 0.86 Pa.s
- Flow speed = 0.001m/s
- Inlet pressure = 15 bars
- Turbulent model : k-omega
If no, I try a 0D/1D CFD tool.
Thank you for your attention
Guillaume

[Yvan Fournier]

Hello,

This seems feasible. Depending on your mesh refinement and chosen turbulence model, heat transfer may be more or less precise (it is more difficult to obtain good heat transfer results than good dynamic results).

Also, do you know the flow speed or the outlet pressure ? Code_Saturne accepts mainly velocity or mass-flow-rate type inlet conditions, though you can use free inlet-oulets and a veclocity source term to obtain a prescribed pressure drop.

Regards,

Yvan

[gbenefice]

Hello,

Thank you for your answer.

The low speed and the inlet pressure are known.
I want to evaluate the heat transfer, the outlet temperature and the outlet pressure (to obtain the pressure drop).

For the inlet, I will use the velocity and thermal dirichlet condition and, for the outlet, a thermal flux equal to 0.

Regards,
Guillaume

[Yvan Fournier]

Hello,

OK, with these type of boundary conditions, thing should work fine (actually, for the outlet, a default Neumann BC should do. The convective part of the thermal flux is not 0).

Regards,

Yvan

[Martin FERRAND]

Hello,
Your flow is laminar (Re=10^-3), therefore no turbulence models are required.
Best Regards
Martin