Journal
JOURNAL OF BIOMECHANICS
Volume 41, Issue 12, Pages 2681-2688Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2008.06.018
Keywords
CT scan; human lung; inspiratory flow; numerical simulation
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Funding
- Hong Kong Polytechnic University [G-U377]
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The inspiratory flow characteristics in a CT-scanned human lung model were numerically investigated using low Reynolds number (LRN) kappa-omega turbulent model. The five-generation airway is extracted from the trachea to segmental bronchi of a 60-year-old Chinese male patient. Computations were carried out in the Reynolds number range of 900-2100, corresponding to mouth-air breathing rates of 190-440 ml/s. Flow patterns on the Re = 2100 and flow rate distribution were presented. in this model, the flow pattern is very complex. To count the effect of laryngeal jet oil trachea inlet, the trachea was extended and modified to simulate the larynx, consequently the inlet velocity profile is biased towards the rear wall. In the inferior lobar bronchi, there are two sterns in which the axial velocity is stronger but secondary velocity is weaker. Secondary flow in the lateral bronchi is stronger than the medial ones. With increasing Re, the air flow increases in the middle, inferior lobes and left main bronchus, i.e., flow biases to left and downward. (c) 2008 Elsevier Ltd. All rights reserved.
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