how to get temperature gradients
 

the problem i am working on is flow through a channel with heat flux from one surface. i have solved the steady state and got results. i want to plot the temperature gradient along the axis of the channel. how can i do that?
(when i have checked the derivatives tab it has only pressure gradients.)
pls help me through this.

Need to manually active by command. Forgot details but you could try to find it by click /solve/set/expert