[ENG.HVAC]

DEAR ALL
MY MODEL IS A PIPE WITH CONSTANT HEAT FLUX 400 w/m2
and i study the effect of change in velocity on the fluid
and in final i get the wall heat transfer cofficient to make plot
of relation between reynold number and nussult number

so when i make another model with the same boundary condition
but i change the heat flux to 1000 w/m2
there is no change in results
can any one please advice me