|XXXVII Workshop on Geometric Methods in Physics||1-7.07.2018|
|VII School on Geometry and Physics||25-29.06.2018|
Frequency dependence on alternating diameter in Rijke Tube
Inserting a metal gauze into a tube, heating it with a bunsen burner and separating the heat source from the tube, produces a sound. The phenomenon is called the Rijke Tube. The effect is observed because that during a contraction, the cool air drawn in is heated and therefore pressure increases, which gives rise of an acoustic sound wave.
The phenomenon has been examined but a shape of the tube has not been considered. We have investigated the process, examined alternating and fixed diameter of the tube and its dependence on the frequency of the sound. Based on the results we constructed and developed an optimum theoretical picture of the process, which had a significant overlap with the classical perception of the phenomenon.
The first observed fact was difference between frequencies of two sounds produced on the downside and on the upside of the gauze, which was highly dependent on the position of the gauze itself. We also investigated the relation between sound propagation (spreading and damping in a standing wave) and tube’s alternating diameter, resulting an amplification of the sound observed in the different points of the tube.
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