I understand they are caused by a temperature gradient, such as a steel tube connected with a reservoir at room temperature and another at 4.2 K. But why are oscillations caused?
Here some documents/papers:
http://www.lanl.gov/thermoacoustics/ehistory.pdf (notice here Rayleigh's view point)
http://lss.fnal.gov/archive/test-tm/1000/fermilab-tm-1676.pdf
Cheers!
Thank you, that was very helpful!
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