The mucus layer which covers the respiratory tract is a non-Newtonian fluid with a yield stress. The amount of shear stress must exceed a certain value before significant deformation (i.e. flow) can occur. Therefore, for better understanding of some interesting phenomena in the airways, such as the propagation or rupture of a mucus plug, as may occur in asthma, cystic fibrosis, or emphysema, the yield stress behavior of the fluid needs to be considered as well.
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Steady State Creeping Displacement of a Semi-Infinite Gas Bubble in a 2D Channel Filled by a Bingham Liquid
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Zamankhan, P, Takayama, S, & Grotberg, JB. "Steady State Creeping Displacement of a Semi-Infinite Gas Bubble in a 2D Channel Filled by a Bingham Liquid." Proceedings of the ASME 2009 Summer Bioengineering Conference. ASME 2009 Summer Bioengineering Conference, Parts A and B. Lake Tahoe, California, USA. June 17–21, 2009. pp. 471-472. ASME. https://doi.org/10.1115/SBC2009-206871
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