Accession Number : AD0274626

Title :   PRESSURE LAG THROUGH ORIFICES AND SHORT TUBES FOR SMALL PRESSURE RATIOS AND FLOW CONDITIONS FROM FREE MOLECULE TO CONTINUUM

Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES ENGINEERING CENTER

Personal Author(s) : EVERTON,J.G. ; SMETANA,FREDERICK O.

Report Date : JAN 1962

Pagination or Media Count : 1

Abstract : Experiments were conducted to determine the time required for the pressure in a one-liter volume to rise to 63% of final value when fille through a short tube. Tube length to diameter ratios of 0.5 to 8.0 were tested. Initial pressure in the volume ranged from about 25 micron to about 25 mm. The pressure at the upstream end of the fill tube was maintained at 1.25 times the initial pressure in the volume for all runs. A rapidly acting pneumatic valve was opened to connect the two chambers. It was found that the fill ti e could be predicted quite satisfactorily at both pressure extremes by variants of conventional theory. At intermediate pressures, however, no satisfactory theoretical prediction was found. (Author)

Descriptors :   *PRESSURE, *REENTRY VEHICLES, *TRANSDUCERS, AIR, ATMOSPHERES, COMPRESSIBLE FLOW, GASES, INSTRUMENTATION, PRESSURE GAGES, RAREFIED GAS DYNAMICS, TIME

Distribution Statement : APPROVED FOR PUBLIC RELEASE