Hi everyone,
Can anyone please explain me the exact difference between the difference between two physical mechanisms (pls. explain in context of sound absorption)
1) PHONON- PHONON INTERACTION.
2) THERMOELASTIC EFFECT.
Both of these contributors sound absorption in solids look similar, in which the basic mechanism is the compressed part of the solid(compression is due to sound wave) gets heated up by concentration of thermal vibrations in that part and the rarefied part of the solid(rarefaction is due to sound wave) gets cooled down. This process disturbs the thermal equilibrium and the subsequent spontaneous process of regaining thermal equilibrium by heat conduction, leads to a conversion of a part of elastic energy of sound wave into heat energy.
I am attaching hereby few links which will help you understand my question properly :
1)http://encyclopedia2.thefreedictiona...tion+in+Solids
2) http://www.academia.edu/509661/EFFEC...CAL_RESONATORS (In these read especially DISSIPATION DUE TO PHONON-PHONON INTERACTIONS).
3) http://www.answers.com/topic/quantum-acoustics (Read Phonon-phonon interaction)
4)http://books.google.co.in/books?id=d...action&f=false (In this read last paragraph of page 241)
I have searched a lot to find out the basic difference between these two mechanisms of sound absorption, namely (Phonon-Phonon interaction and thermoelastic effect) on google. But I could not find any satisfactory result.
So, I posted this thread on physicsforums with a hope of help.
Please do explain by being as simple as possible, using least mathematics:tongue2:. But please do reply correctly. Take your time, understand what I mean to say and then only reply. Please do not reply hastily. I am too patient. Do not worry if it takes long to think and finding sources of information as this question is very complex and sources on google are millions but none of them provide satisfactory simple answer of the difference between working mechanisms of these two processes.
Can anyone please explain me the exact difference between the difference between two physical mechanisms (pls. explain in context of sound absorption)
1) PHONON- PHONON INTERACTION.
2) THERMOELASTIC EFFECT.
Both of these contributors sound absorption in solids look similar, in which the basic mechanism is the compressed part of the solid(compression is due to sound wave) gets heated up by concentration of thermal vibrations in that part and the rarefied part of the solid(rarefaction is due to sound wave) gets cooled down. This process disturbs the thermal equilibrium and the subsequent spontaneous process of regaining thermal equilibrium by heat conduction, leads to a conversion of a part of elastic energy of sound wave into heat energy.
I am attaching hereby few links which will help you understand my question properly :
1)http://encyclopedia2.thefreedictiona...tion+in+Solids
2) http://www.academia.edu/509661/EFFEC...CAL_RESONATORS (In these read especially DISSIPATION DUE TO PHONON-PHONON INTERACTIONS).
3) http://www.answers.com/topic/quantum-acoustics (Read Phonon-phonon interaction)
4)http://books.google.co.in/books?id=d...action&f=false (In this read last paragraph of page 241)
I have searched a lot to find out the basic difference between these two mechanisms of sound absorption, namely (Phonon-Phonon interaction and thermoelastic effect) on google. But I could not find any satisfactory result.
So, I posted this thread on physicsforums with a hope of help.
Please do explain by being as simple as possible, using least mathematics:tongue2:. But please do reply correctly. Take your time, understand what I mean to say and then only reply. Please do not reply hastily. I am too patient. Do not worry if it takes long to think and finding sources of information as this question is very complex and sources on google are millions but none of them provide satisfactory simple answer of the difference between working mechanisms of these two processes.
Thanks For Your Attention