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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v33.i2.50
pages 175-185

Effect of Properties of Alveolar Walls on Sound Velocity in Pulmonary Parenchyma

Valery Oliynik
Institute of Hydromechanics of National Academy of Sciences of Ukraine


An acoustic model of parenchyma is offered, modified by the allowance for elastic properties of alveolar walls, transpulmonary pressure and surface tension forces acting on the gas-tissue interface. The problem of acoustic modeling of the lung tissue is reduced to considering an individual spherical bubble with a supported surface pulsing in an infinite liquid. It is proved that the basic role in the alveole's surface reinforcement is played by the longitudinal rigidity of its walls. A calculated increase of sound velocity in mammalian parenchyma caused by the alveole reinforcement does not exceed 20 %. It is shown that the reinforcement influences properties of the lungs most strongly in large mammals, which alveoles contain the greater share of elastin and collagen. Comparing of theoretical data with the experimental ones has shown a satisfactory agreement between them.

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