A Caltech Library Service

Pulmonary Gas Transplant Time

Shair, F. H. and Wagner, W. W. and Olson, D. E. (1969) Pulmonary Gas Transplant Time. Science, 165 (3895). pp. 823-824. ISSN 0036-8075. doi:10.1126/science.165.3895.823.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


The experimental evidence presented by Wagner et al. (1) does not imply that there is an interaction between the bulk flow and diffusion. On the contrary, the C-shaped curve in Fig. 1 suggests that the mechanism of transport is by convection alone [a more detailed discussion of convective dispersion is given in (2)]. The fact that the shortest transit time is about half that obtained from a calculation based upon the average velocity would also result if the velocity profile in the ducts are nearly parabolic; when the Reynolds number of the flow is less than about 2100, the velocity profile is nearly parabolic and the maximum velocity within the duct is nearly twice the average velocity. Furthermore, because Taylor diffusion (3) involves only radial diffusion, the minimum transit time does not change; that is, the minimum transit time remains equal to the distance between the larynx and the alveolus, divided by the velocity of the fastest streamline.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:© 1969 American Association for the Advancement of Science. Received 28 March 1969.
Issue or Number:3895
Record Number:CaltechAUTHORS:20151214-092743865
Persistent URL:
Official Citation:Pulmonary Gas Transplant Time F. H. Shair, W. W. Wagner Jr., and D. E. Olson Science 22 August 1969: 165 (3895), 823-824. [DOI:10.1126/science.165.3895.823]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62847
Deposited By: Tony Diaz
Deposited On:14 Dec 2015 17:32
Last Modified:10 Nov 2021 23:07

Repository Staff Only: item control page