Learning Forum

[QUSAI HAMID]

Hello, and good day... 

I want to determine the temperature (T) of the NiTi wire with different lengths of 100, 200, and 300 mm. I used steady-state thermal-electric conduction in Ansys Workbench and added this command (antype,4) to get the transient analysis with time. I found the temperature was different by changing the diameter of the wire, but it was still the same for different lengths. What is wrong, please?

I used the convection coefficient (h) =5 W/m^2-C for the surface of the wire and applied a 1A current through the wire (by adding v = 0 on one side and A = 1 for the opposite). The specific heat values are 320 J/kg-°C, thermal conductivity is 18 w/m-c, resistivity (ρ) = 8 x 10-5 Ω-cm, and density is 6450 kg/m3.

[Erik Kostson]

 

 

Hi

Not sure, but I would not use this system.

Use coupled field transient to do the thermal electric transient analysis.

See this post for more info:

/forum/forums/topic/electrothermal-simulation-of-a-fuse-temperature-problem/

All the best

Erik

Also to add.

As you are a student it is key for you to try and understand the physics and the situation you are modelling, and ultimately interpret these results, as this (interpret and validate reults) is required in working life later on (e.g., working as an engineer or fea analyst needing to see if results make sense - one cannot ask for help then from others to do that work (validate/understand and verify) for you). To see why the results are as they are (they are correct, doubt that it would give you a wrong answer for such a simple problem), think about heat energy balances. With this (energy balance), and seeing that the temperature actually is changing with the diameter of the wire, but not for different wire lengths you can try and figure why that is. Also there might besome good text books in this from your studies as you are studying it seems thermal-electric effects) that can help you understand these results (which are ok as we said). Good luck

 

[QUSAI HAMID]

 

Thanks for your help.

I used steady-state thermal-electric conduction in Ansys Workbench, 2022R1, but you mentioned in this link

/forum/forums/topic/electrothermal-simulation-of-a-fuse-temperature-problem/

the latest releases (2023 R1).

Kindlly, Can I get a result in my 2022R1 or not?

Any help would be greatly appreciated. Thank you in advance!

 

[Erik Kostson]

Hi
So if you do not have 2023 R1 then you need to do as you do now, so with steady state and use apdl command snippet to run into transient as shown here:
/forum/forums/topic/transient-thermal-electric-simulation/
As for the results try and compare them to some tests or analytical calculation of what you are analysing.
All the best
 
Erik

[QUSAI HAMID]

Hi Erik

Thanks for your efforts. However, the results are still the same for different wire lengths.
Any other suggestions?

Best regards.