Abstract
In diseased lungs airway closure can occur due to the formation of liquid bridges. These can be caused e.g. by surface tension-driven instabilities. The airway closure leads to a blockage of gas exchange in the deeper part of the lung which in severe cases requires to apply mechanical ventilation and recruitment maneuvers. High-frequency ventilation is refered therein as a proper way to enhance mass transport and keep the lung open. The present paper discusses the transport near the air-liquid interface under oscillatory excitation. A rigid tube model partially filled with liquid representing the airway blockage is used. An oscillatory flow with varying frequencies and amplitudes is applied with the aim to investigate the conditions for liquid break up and drop formation at the interface. It was found in high-frequency oscillation that near the interface a convective mass transport is generated due to secondary streaming. Above a critical value of excitation amplitudes for constant frequencies, the interface becomes unstable and drop formation starts. It can be assumed that despite the physical blockage effect in the presence of liquid bridges, high-frequency ventilation induces enhanced mass exchange across the interface and may help to break-up the liquid bridges.
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Bauer, K., Chaves, H., Brücker, C. (2011). Transport at Air-Liquid Bridges under High-Frequency Ventilation. In: Klaas, M., Koch, E., Schröder, W. (eds) Fundamental Medical and Engineering Investigations on Protective Artificial Respiration. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 116. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-20326-8_10
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DOI: https://doi.org/10.1007/978-3-642-20326-8_10
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