Accession Number:

AD0272046

Title:

THE USE OF A HIGH ROTATIONAL SPEED CONCENTRIC CYLINDER APPARATUS IN FREE MOLECULE FLOW. A COMPARISON OF THEORY AND EXPERIMENT

Descriptive Note:

Corporate Author:

VIRGINIA UNIV CHARLOTTESVILLE RESEARCH LABS FOR THE ENGINEERING SCIENCES

Personal Author(s):

Report Date:

1962-02-01

Pagination or Media Count:

1.0

Abstract:

A concentric cylinder apparatus is used for studying viscous effects in fluids. It is of interest to compare these measurements with calculations made from theory applicable to the appropriate low-density flow regime. These theories must be developed on the basis of the mechanism of the momentum transfer between the gas molecules and the solid surfaces involved. Unfortunately, this mechanism is not clearly understood and, therefore, the theories either make assumptions concerning the mechanism or express results in terms of a parameter involving the nature of the interaction mechanism. Thus, by comparing the rotating cylinder measurements with theory, a possibility exists for at least deducing something concerning the value of the parameter required to describe the interaction process. The comparison is most significant in the free-molecule regime where the analysis enjoys a reasonably high degree of confidence, since intermolecular collisions are negligible and only the wall-molecule interactions are important. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE