- #1
davidgruty
- 20
- 0
Hi there!
I run into a situation where I can't go on. It's about a thermal analysis, I already made a simulation using Ansys but I also want an approach made "by hand".
In order to simplify the case I made this example:
We have a metallic bar inside the soil. The bar is at 100ºC and the soil at 20ºC. Check the attached picture.
Once we stick the bar on the ground I understand there is a gradient of temperature radially in the soil, from 100ºC (perfect contact, Point A) to 20ºC (Point B).
I know all the heat goes by conduction according to:
q = 2 π k (ti - to) / ln(ro / ri), but I don't know the distance.
My two questions are:
1) where does the gradient in the soil stops? what's the distance up to the 20ºC? Where is the point B located? (ok, these are 3 questions, but it's always the same!)
2) How long does it take to the point A to get back to 20ºC?
We neglect the superficial conditions (convection, radiation)
We know all the material properties
Thank you
regards,
I run into a situation where I can't go on. It's about a thermal analysis, I already made a simulation using Ansys but I also want an approach made "by hand".
In order to simplify the case I made this example:
We have a metallic bar inside the soil. The bar is at 100ºC and the soil at 20ºC. Check the attached picture.
Once we stick the bar on the ground I understand there is a gradient of temperature radially in the soil, from 100ºC (perfect contact, Point A) to 20ºC (Point B).
I know all the heat goes by conduction according to:
q = 2 π k (ti - to) / ln(ro / ri), but I don't know the distance.
My two questions are:
1) where does the gradient in the soil stops? what's the distance up to the 20ºC? Where is the point B located? (ok, these are 3 questions, but it's always the same!)
2) How long does it take to the point A to get back to 20ºC?
We neglect the superficial conditions (convection, radiation)
We know all the material properties
Thank you
regards,
