[black.rose1370]

Hello
i'm confused about measuring nusselt. i know it's very simple. my problem is:
2D pipe mesh With L=30m , D=.00615
laminar flow (Re=2300 and Velocity=0.375m/s)
fluid=water
wall temprature fixed (nusselt must calculate 3.66)

We know nu=(Q/T wall - T bulk)*(D/K)
T wall=Constant=313.15
D=0.00615
k=0.6
Q=?
T bulk=?

questions:
1. I know Q measure in wall and its decreasing to the outlet. in above relation me must replace Q at inlet of the wall (L=0) ? or Q at outlet (L=30) ? or avg Q? or Integral Q?
and where can i finde this option at fluent?
2. What does meaning of Bulk Temprature? I know fluent creat one surface near the wall and measure T bulk but How? avg of T bulk? (T in + T out)/2 ? Integral Temprature? is there any correct relatiion for calculate T bulk?
3. how can I see 3.66 number?


tnx.