Thermal effect of heat input on an iron rod - magnetostriction

AI Thread Summary
An iron rod placed within two coils experiences length changes due to magnetostrictive properties when current flows in the same direction. Initially, the rod increases in length, but eventually, it begins to reduce in length. When currents oppose each other, the focus shifts to thermal properties, where heat input causes the rod to lengthen without magnetostrictive influence. The discussion raises questions about whether the rod will reach a maximum length and stop as heat input increases. The Villari Reversal Effect is mentioned as a related concept in understanding these phenomena.
ZedCar
Messages
353
Reaction score
1
If an iron rod, inside two coils, incurs current going through the coils in the same direction, then the rod will increase in length and then it will begin to reduce in length.

This is due to the magnetostrictive properties of the iron.

When the currents oppose each other, so as to cancel, then the thermal properties only can be studied. That is, without the influence of magnetostriction.

The iron rod would increase in length due to the heat input.

But will it get to a certain length, then stop? That is, as the heat input continues to rise.

As the heat input continues to rise, I presume it won't reduce in length?

Thank you.
 
Physics news on Phys.org
ZedCar said:
If an iron rod, inside two coils, incurs current going through the coils in the same direction, then the rod will increase in length and then it will begin to reduce in length.

I had to look it up as this isn't my subject but are you talking about the Villari Reversal Effect?
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
View full post »

Thread 'Why measure the speed of light in one direction?'

It may be shown from the equations of electromagnetism, by James Clerk Maxwell in the 1860’s, that the speed of light in the vacuum of free space is related to electric permittivity (ϵ) and magnetic permeability (μ) by the equation: c=1/√( μ ϵ ) . This value is a constant for the vacuum of free space and is independent of the motion of the observer. It was this fact, in part, that led Albert Einstein to Special Relativity.
View full post »

Similar threads

I How induction works within a coil (nuances of it)
Replies
6
Views
2K
Construction Can a radiant barrier in the attic be effective?
Replies
26
Views
2K
Complete thermal decomposition of specific compounds
Replies
4
Views
3K
What will happen to the heat input of the two-phase system?
Replies
3
Views
2K
Modeling analytical solution of 1D heat equation
Replies
7
Views
3K
B field inside solenoid as a result of iron rod
Replies
1
Views
2K
Heating a Cabaret during the winter
Replies
4
Views
1K
Work and Heat Transfer in a Magnetic Field: Conduction Rod on Conducting Rails
Replies
5
Views
2K
Some questions on heat transfer
Replies
5
Views
2K
Thermal conduction of heat by a solid body
Replies
6
Views
3K

Hot Threads

Recent Insights

Back
Top