[kandoi]

Hi,
i have used single phase approach for calculating the enhancement in HTC in a flow through a channel ,for the same first i have calculated the HTC (both local along the wall surface and Avg) for plane water without any nanofluid thereafter i have inputted the thermophysical properties of water+nanoparticle properties but the HTC is decreasing which is contrary to literature.
the BC are :
inlet v=
temp 293 k
outlet =outflow
wall temp=310 k
in reference values i have changed the length value to be the hydraulic dia
and for temp=the tbulk i have approached two method
1)made a centerline in the channel and calculated the weighted ag along the line
2)(outlet+inlet)/2

but in both these cases the HTC and NU is decreasing
Plz help in telling why there is an anomaly of the current analysis with literature.....

thanks in advance