Heating element

[driga]

Hello all,

I am looking for a heating element to be used in a channel flow. Until now, there are several alternatives, but I still have a hard time to decide.

The requirement are as follow:
1. Capable of creating a constant temperature as well as constant heat flux boundary condition.
2. If possible, transparent.
3. If possible, can be shaped as sinus wave form.
4. Large enough, (length: approx. 180 mm, width: approx. 60 mm).

If anyone have any experience or suggestion, please let me know.

Thanks in advance.