Accession Number : AD0692716

Title :   DISCRETE FLOW RATES OF THE HELIUM FILM,

Corporate Author : ROYAL MILITARY COLL OF CANADA KINGSTON (ONTARIO) DEPT OF PHYSICS

Personal Author(s) : Turkington,R. R. ; Edwards,M. H.

Report Date : 30 NOV 1967

Pagination or Media Count : 4

Abstract : Measurements of the helium-film flow rates over a stainless steel substrate have been made using the heat-transport method of Bowers, Brewer, and Mendelssohn. The moving film from a reservoir is vaporized inside a copper box at the top of the stainless steel capillary in a closed system, by electrical heating. The vapor recondenses in the isothermal reservoir. On any day's run, the rate was constant and reproducible to within 1%. The complete range of flow rates observed at 1.2 degrees K on separate days was about 50%. Seven discrete rates were in fact observed in 18 runs nearly equally spaced at intervals of 0.0000083 sq cm/sec. At present, no theory predicts discrete flow rates. (Author)

Descriptors :   (*LIQUEFIED GASES, HELIUM), (*SUPERFLUIDITY, FLOW SEPARATION), FILMS, CRYOGENICS, FLUID FLOW, CANADA

Subject Categories : Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE