| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系碩博士班 === 100 === Lung is the most important respiratory organ in human body, in many flow field parameter, pressure loss plays an important characteristics in lung airway, different pressure loss causes different flow field model, an alteration in pressure loss is a means of detecting respiratory diseases.
In this paper, pressure loss for geometric variations under bifurcation tubes has analyzed by a numerical software. The purpose of this research is to analyze pressure loss and wall shear stress by changing branching angle, parent and daughter length between two fixed points distance. The numerical simulation is made by commercial program Ansys Fluent. The PISO method is chosen in this study.
From these results, pressure loss increases as branching angle increases. Wall shear stress reaches the maximum value in the junction inlet in outer wall. Wall shear stress decreases after the carina in daughter tube inner wall. Average wall shear stress increases as branching angle in daughter tube and junction part, it shows that wall shear stress is related to the pressure loss.
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