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RESEARCH PAPERS

Approximate Correction for Unsteady Pressure Differential in a Capillary-Tube Gas Viscosimeter

[+] Author and Article Information
K. R. van Doren, R. A. Guereca, H. P. Richardson, D. Cummins

Helium Research Center, Bureau of Mines, U. S. Department of Interior, Amarillo, Texas

J. Appl. Mech 36(2), 171-180 (Jun 01, 1969) (10 pages) doi:10.1115/1.3564604 History: Received October 16, 1968; Revised January 17, 1969; Online September 14, 2011

Abstract

Equations are developed which satisfactorily describe the change in the pressure differential with time for a closed, constant-volume system which utilizes a coiled-capillary tube and a constant-rate pump to determine gas viscosities. Viscosities are computed at transient, unsteady, and apparent-steady-state conditions. As long as the flow rates are not too high and the pressure level is not too low, the computed viscosities appear to be reliable.

Copyright © 1969 by ASME
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