rotating pipe flow wall boundary condition problem
 

hi,

i was trying to simulate a simple case of pipe flow with the pipe rotating about an axis which is perpendicular to the axis of the pipe. i am giving insulated boundary condition at wall and density of air as ideal gas. at the outlet of the pipe air temperature increases and there are some heat flux through the wall although i have given insulated boundary condition.

is this because rotational frame does work on the fluid body? how can we quantify the work input in terms of rotational speed?

anybody has any idea? plz share...

thnx guys....