THE STEADY EXPIRATORY PRESSURE-FLOW RELATION IN A MODEL PULMONARY BIFURCATION

被引:14
作者
COLLINS, JM [1 ]
SHAPIRO, AH [1 ]
KIMMEL, E [1 ]
KAMM, RD [1 ]
机构
[1] MIT, FLUID MECH LAB, CAMBRIDGE, MA 02139 USA
来源
JOURNAL OF BIOMECHANICAL ENGINEERING-TRANSACTIONS OF THE ASME | 1993年 / 115卷 / 03期
关键词
D O I
10.1115/1.2895490
中图分类号
Q6 [生物物理学];
学科分类号
071011 ;
摘要
Experiments were conducted o ver a range of Reynolds numbers from 50 to 8000 to study the pressure-flow relationship for a single bifurcation in a multi-generation model during steady expiratory flow. Using the energy equation, the measured static pressure drop was decomposed into separate components due to fluid acceleration and viscous energy dissipation. The frictional pressure drop was found to closely approximate that for an equivalent length of curved tube with the same curvature ratio as in the model bifurcation. The sensitivity of these results to changes in airway cross-sectional shape, non-planar configuration, and flow regime (laminar-turbulent) was investigated. In separate experiments using dye visualization and hot-wire anemometry, a transition to turbulent flow was observed at Reynolds numbers between 1000 and 1500. Transition had very little effect on the pressure-flow relation.
引用
收藏
页码:299 / 305
页数:7
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