Experiments on thermally driven acoustic oscillations of gaseous helium

TLDR: In this paper, the authors describe experimental studies of thermally driven acoustic oscillations of a gas column (Taconis vibration) generated in a pipe whose end is closed at the warm part and open at the cold part.

Abstract: This paper describes experimental studies of thermally driven acoustic oscillations of a gas column (“Taconis vibration”) generated in a pipe whose end is closed at the warm part and open at the cold part. The stability curves and the frequency diagrams of the oscillations are experimentally determined under a given temperature distribution for the ratio of warm length of pipe to cold length as a parameter. The existence of two branches as predicted by Rott's theory is confirmed. A finite boundary layer thickness plays an important role in exciting and characterizing this type of instability.