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International Journal of Fluid Mechanics Research

Published 6 issues per year

ISSN Print: 2152-5102

ISSN Online: 2152-5110

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.1 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 1.3 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.0002 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.33 SJR: 0.256 SNIP: 0.49 CiteScore™:: 2.4 H-Index: 23

Indexed in

Sound Propagation in Human Bronchial Tree. Part II. Analysis of Numerical Results

Volume 28, Issue 3, 2001, 11 pages
DOI: 10.1615/InterJFluidMechRes.v28.i3.30
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ABSTRACT

Following the solution algorithm of the problem concerned with propagation of the sound waves in a bronchial tree, developed in the previous paper, the acoustic properties of human bronchial tree are numerically investigated. In particular, the imaginary part of an entry impedance of a bronchial tree is demonstrated to have resonances and antiresonances following one after another. Considerable "peaks" of the real part of an impedance therewith are found on the antiresonance frequencies, while "falls" on the resonances. A comparison between designed and experimental values of an input impedance is conducted and their satisfactory coincidence is shown. Distribution of the sound energy flows in the bronchial tree is studied. It is shown that the energy in the sound propagation process damps rather quickly at the expense of losses in visco-elastic walls of pneumatic paths and re-radiation by walls of the energy in the surrounding biotissue. The essential dependence is proved for phase velocity of the sound inside a bronchial tree both from frequency, and from choice of the initial and the final points of the bronchial tree site, for which this velocity is estimated. It is demonstrated that this speed can be much below and above the sound speed in the free air environment. Possible delay factor of the sound signal at its passing from the onset of trachea's up to the thorax surface is estimated.

CITED BY
  1. Vovk I. V., Grinchenko V. T., Matsypura V. T., The nature of respiration noise and its multifractal properties, Acoustical Physics, 59, 5, 2013. Crossref

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