The Effect of a Turbulent Jet on Gas Transport During Oscillatory Flow

[+] Author and Article Information
R. D. Kamm, E. T. Bullister, C. Keramidas

The Massachusetts Institute of Technology, Cambridge, Mass. 02139

J Biomech Eng 108(3), 266-272 (Aug 01, 1986) (7 pages) doi:10.1115/1.3138613 History: Received September 06, 1985; Revised March 20, 1986; Online June 12, 2009


Axial mass transport due to the combined effects of flow oscillation and a turbulent jet was studied both experimentally and with a simple theoretical model. The experiments show that the distance over which turbulence enhances transport is greatly increased by flow oscillation, and is particularly sensitive to tidal volume. The jet flow rate and jet configuration are relatively less important. To analyze the results, the region influenced by the jet is divided into two zones: a near field in which the time-mean flow velocities are larger than the turbulent fluctuations, and a far field where the time-mean flow is essentially zero. In the far field, axial mass transport is increased due to the turbulence which decays in strength away from the jet. When oscillatory flow is superimposed upon the steady jet flow, the turbulence in the far field interacts with the flow oscillations to augment the transport of turbulence energy and of mass. This transport enhancement is modeled by introducing an effective axial diffusivity analogous to that used in laminar oscillatory flow.

Copyright © 1986 by ASME
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