need to calculate Nusselt Number
 

hey there
need help calculate Nu on blockage
a laminar flow in rectangular pipe
i uploaded the pic of the geometry

http://img706.imageshack.us/img706/8031/ekran1.th.png

adiabatic walls
blockage has fixed temp 350 K
fluid is air with 300 K temp

thanx for help...

Hi!

In cases like this, I create a region (plane, line) near the wall (with a distance dx), then the expression dT/dx can be estimated, and therefore the nusselt number. Otherwise, you can use the variable "wall heat coefficient"

I hope this help you, good luck.