Thermal fluid flow element in abaqus

Hello there!

I have to model a pipe flow problem in abaqus/standard. There is a  thermal fluid flow element in the abaqus element library, but I not sure to which geometry I can assign this section like solid, shell or wire. Further what should be the section type. I am not able to assign this element to a solid geometry. I would appreciate any suggestions 

Edu  Abaqus