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Measurement of viscosity of gaseous mixtures at atmospheric pressureCoefficients of viscosity of various types of gas mixtures, including simulated natural-gas samples, have been measured at atmospheric pressure and room temperature using a modified capillary tube method. Pressure drops across the straight capillary tube section of a thermal mass flowmeter were measured for small, well-defined, volume flow rates for the test gases and for standard air. In this configuration, the flowmeter provides the volumetric flow rates as well as a well-characterized capillary section for differential pressure measurements across it. The coefficients of viscosity of the test gases were calculated using the reported value of 185.6 micro P for the viscosity of air. The coefficients of viscosity for the test mixtures were also calculated using Wilke's approximation of the Chapman-Enskog (C-E) theory. The experimental and calculated values for binary mixtures are in agreement within the reported accuracy of Wilke's approximation of the C-E theory. However, the agreement for multicomponent mixtures is less satisfactory, possible because of the limitations of Wilkes's approximation of the classical dilute-gas state model.
Document ID
19860015491
Acquisition Source
Legacy CDMS
Document Type
Technical Publication (TP)
Authors
Singh, J. J.
(NASA Langley Research Center Hampton, VA, United States)
Mall, G. H.
(Computer Sciences Corp. Hampton, Va, United States)
Chegini, H.
(Old Dominion Univ. United States)
Date Acquired
September 5, 2013
Publication Date
May 1, 1986
Subject Category
Instrumentation And Photography
Report/Patent Number
L-16103
NAS 1.60:2582
NASA-TP-2582
Accession Number
86N24962
Funding Number(s)
PROJECT: RTOP 141-20-10-04
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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