Rozložení toku a rychlostní profily v realistickém modelu dýchacích cest člověka

Flow distribution and velocity profiles in realistic human airway model

conference paper

en

Comparisons of published studies done on idealized lung geometry with investigations made on more realistic models have shown an influence of complex actual geometry on flow and particle transport. To enable optical measurement of aerosol transport with air as working fluid, we created realistic thin-walled transparent airway model. The non-symmetric bifurcation model reflects real non-planar lung geometry and spans from throat to 3rd-4th generation of bronchi. Two realistic airway models were used for study of flow distribution into particular lung branches at three steady and three oscillatory flow regimes. Significant differences were found in flow rate distribution into the individual branches of each model and also between both the models. Velocity of aerosol in trachea was studied using Phase Doppler Analyzer. Mean axial velocity followed the harmonic course of generated flow. Turbulence level was found lower in the inspiration then in the expiration part of the cycle.

Ukazuje se že výsledky získané studiem na zjednodušených modelech dýchacích cest člověka se liší od skutečných dat. Také studie prováděné při stacionárních režimech dýchání poskytují odlišné data od režimů cyjklických. Práce zde je provedena na realistickém modelu při stacionárních i cyjklických režimech dýchání. Použit je aerosol různých velikostí a režimy dýchání s různou frekvencí a dechovým objemem.

Comparisons of published studies done on idealized lung geometry with investigations made on more realistic models have shown an influence of complex actual geometry on flow and particle transport. To enable optical measurement of aerosol transport with air as working fluid, we created realistic thin-walled transparent airway model. The non-symmetric bifurcation model reflects real non-planar lung geometry and spans from throat to 3rd-4th generation of bronchi. Two realistic airway models were used for study of flow distribution into particular lung branches at three steady and three oscillatory flow regimes. Significant differences were found in flow rate distribution into the individual branches of each model and also between both the models. Velocity of aerosol in trachea was studied using Phase Doppler Analyzer. Mean axial velocity followed the harmonic course of generated flow. Turbulence level was found lower in the inspiration then in the expiration part of the cycle.

realistický model, dýchacích cesty člověka, proudění vzduchu, aerosol

Flow distribution, flow velocity, realistic model, human airway

2009

02.06.2009

Institute of Hydrodynamics ASCR

Praha

978-80-87117-06-4

Sborník XXIII. Sympozia o anemometrii

1–9

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