Journal of Applied Physiology
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J Appl Physiol 51: 1072-1079, 1981;
8750-7587/81 $5.00
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Journal of Applied Physiology, Vol 51, Issue 5 1072-1079, Copyright © 1981 by American Physiological Society

ARTICLES

Steady pressure-flow relationship of a model of the canine bronchial tree

D. B. Reynolds and J. S. Lee

Static pressure differences (deltaP) across the entire length and portions of a latex reproduction of a canine bronchial tree were measured during steady inspiratory or expiratory flow (V). The reproduction consists of a 10-cm length of trachea through bronchi of about 2 mm in diameter. The airflow was simulated by a water flow with tracheal Renolds number (Re0) in the range from 1,500 to 10,000. Loss in total pressure (deltaPt) was computed by summing deltaPt and V were well described (r greater than 0.98) by a dimensionless Rohrer equation deltaPt/deltaPd0 = A + B Re0 applicable to gas flow, in which deltaPd0 is a Poiseuille pressure drop. For expiratory deltaPt, A was about twice that for inspiration, while the values for B were nearly equal. Differences in kinetic energy between sites of static pressure measurement are important in determining loss in total pressure. Rohrer's equation is a good approximation to the phenomenological laws of steady inspiratory and expiratory flow-pressure relations in the canine bronchial tree for the range of Reynolds number investigated.


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R. C. Anafi and T. A. Wilson
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J Appl Physiol, September 1, 2001; 91(3): 1185 - 1192.
[Abstract] [Full Text] [PDF]


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