How Collapsing Airways Create Sound: Clue to Diagnosing Lung Disease
Researchers have mapped how air moving through collapsing airways generates the wheezing sounds doctors hear during respiratory illness. The work could lead to acoustic sensors that detect lung collapse and disease progression earlier, with applications for remote patient monitoring and diagnostic devices.
Originaltitel: Sound generation mechanisms in a collapsible tube
<p>Collapsible tubes can be employed to study the sound generation mechanism in the human respiratory system. The goals of this work are (a) to determine the airflow characteristics connected to three different collapse states of a physiological tube and (b) to find a relation between the sound power radiated by the tube and its collapse state. The methodology is based on the implementation of computational fluid dynamics simulation on experimentally validated geometries. The flow is characterized by a radical change of behavior before and after the contact of the lumen. The maximum of the sound power radiated corresponds to the post-buckling configuration. The idea of an acoustic tube law is proposed. The presented results are relevant to the study of self-excited oscillations and wheezing sounds in the lungs.</p>