temperature rise due to viscous dissipation

Marek

Hi,

could someone comment whether I understood the following issue correctly or not.

In a pump with oil the oil get heated while transported through the pump. This heat rise comes from the viscous dissipation term in the energy equation, which is a heat source if large velocity gradients are present.

1. Will it be possible to see that effect, if I simulate a large mass flow through a small pipe. In the boundary layer there will be large gradients so energy will be converted into heat there. So will I see a temperature rise there?

2. What about dissipation of turbulent kinetic energy? Using the k-eps modell how will the dissipation of k contribute the a temperature rise in the fluid?

I'm not quite sure whether I understood everything correctly, so your opinions will be appreciated.

Merry christmas, Marek