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RESEARCH PAPERS

A Numerical Model of Expired Flow in a Monoalveolar Lung Model Subjected to Pressure Ramps

[+] Author and Article Information
M. Thiriet, M. Bonis, A. S. Adedjouma, J. P. Yvon

Universite de technologie de Compiegne, BP233, 60206 Compiegne, and INSERM U296, 94010 Creteil Cedex, France

J Biomech Eng 111(1), 9-16 (Feb 01, 1989) (8 pages) doi:10.1115/1.3168349 History: Received August 21, 1987; Revised October 24, 1988; Online June 12, 2009

Abstract

A numerical investigation of pulmonary flow properties was carried out in a monoalveolar model composed of a balloon and a compliant tube in series, subjected to pressure ramps. The flow is shown to become quickly limited by a wave-speed mechanism, occurring at the peak flow. The critical point then travels upstream, while the main part of the exit flow rate is provided by the tube collapse. After the critical flow period, the flow becomes subcritical and viscous effects are predominant in the deeply collapsed tube.

Copyright © 1989 by ASME
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