Abo Bibliothek: Guest
Digitales Portal Digitale Bibliothek eBooks Zeitschriften Referenzen und Berichte Forschungssammlungen
International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

Volumes:
Volumen 47, 2020 Volumen 46, 2019 Volumen 45, 2018 Volumen 44, 2017 Volumen 43, 2016 Volumen 42, 2015 Volumen 41, 2014 Volumen 40, 2013 Volumen 39, 2012 Volumen 38, 2011 Volumen 37, 2010 Volumen 36, 2009 Volumen 35, 2008 Volumen 34, 2007 Volumen 33, 2006 Volumen 32, 2005 Volumen 31, 2004 Volumen 30, 2003 Volumen 29, 2002 Volumen 28, 2001 Volumen 27, 2000 Volumen 26, 1999 Volumen 25, 1998 Volumen 24, 1997 Volumen 23, 1996 Volumen 22, 1995

International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v28.i3.30
11 pages

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

V. G. Basovsky
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
I. V. Vovk
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine
O. I. Vovk
Institute of Hydromechanics of National Academy of Sciences of Ukraine, Kyiv, Ukraine

ABSTRAKT

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.


Articles with similar content:

THE DYNAMICS OF AUTODYNE SIGNAL AND NOISE CHARACTERISTIC FORMATION AT HIGH TARGET SPEEDS
Telecommunications and Radio Engineering, Vol.79, 2020, issue 6
Kirill D. Shaidurov, A. S. Vasiliev, K. A. Ignatkov, G. P. Ermak, V. Ya. Noskov
On Spectral Modeling of Microwave Devices
Telecommunications and Radio Engineering, Vol.55, 2001, issue 8
A. V. Gritsunov
SIMULATION OF THE FLOW OF SUPERHEATED FLUID INTO A CLOSED VOLUME
Interfacial Phenomena and Heat Transfer, Vol.7, 2019, issue 3
Ivan Vozhakov, Maksim V. Alekseev, Sergey I. Lezhnin
On Generation of Tonal Sound Vibrations by Airflow in Stenotic Airways
International Journal of Fluid Mechanics Research, Vol.31, 2004, issue 5
V. G. Basovsky, I. V. Vovk, O. I. Vovk
TWO-STEP START TRANSIENTS WITH LONG FEEDLINES DISCHARGING LIQUID THROUGH SHARP-EDGED CYLINDRICAL NOZZLES
Atomization and Sprays, Vol.12, 2002, issue 1-3
K. Ramamurthi, R. Patnaik