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RESEARCH PAPERS

Gas Transport During Oscillatory Flow in a Network of Branching Tubes

[+] Author and Article Information
R. D. Kamm, J. Collins, J. Whang, M. Greiner

Massachusetts Institute of Technology, Cambridge, Mass. 02139

A. S. Slutsky

West Roxbury V.A. Medical Center, Boston, Mass. 02130

J Biomech Eng 106(4), 315-320 (Nov 01, 1984) (6 pages) doi:10.1115/1.3138500 History: Received June 28, 1983; Revised April 17, 1984; Online June 15, 2009

Abstract

A transport coefficient was measured for a range of oscillatory flow conditions in a branching network of tubes. Measurements were made both across the first generation of a three-generation network and the second generation of a four-generation network. The results for these two series of tests were similar, indicating that there was no significant effect due to the system boundaries. The results are cast in terms of an effective axial diffusion coefficient of the form

Deff = (ϰ + 0.50Vt1.66f0.94)cm2/s
where ϰ is the molecular diffusivity, Vt is the local stroke volume (cc), and f is the oscillation frequency (Hz). These results are compared to those obtained by other investigators in branching systems of similar geometry. At low frequency, this result is found to be in approximate agreement with the steady flow result of Scherer, et al. [15]. This expression differs from the oscillatory flow results of Tarbell, et al. [19] for liquids, primarily in terms of the effects of oscillation frequency.

Copyright © 1984 by ASME
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