THEORETICAL AND EXPERIMENTAL STUDY OF VARIOUS DIFFUSION PUMP OILS.
Abstract
DC 704, DC 705, and Convalex 10 diffusion pump oils were studied in baffled systems operating at 10 to the -7th power to 10 to the -9th power torr for periods up to 5 mos. The pumping stations, with fail-safe instrumentation, used 6-inch frac tionating pumps with water-cooled caps, and cooled optically tight baffles of either chevron traps or right-angle elbows. A sensitive analytical procedure involving ultraviolet absorption spec tra was developed to measure the quantity of oil deposited. The amount of backstreaming oil with both baffles and collection plate cooled with 5 C water varied from 1 x 10 to the -6th power to 10 to the -8th power mg/(sq cm) (min) as follows: DC 704 (chevron) > DC 705 (chevron) > Convalex 10 (chevron) > DC 705 (elbow) > Convalex 10 (elbow). One-fifth as much backstreaming was obtained with Convalex 10 compared with DC 705 under comparable conditions and also one-fifth as much with the elbow baffle compared with the chevron baffle. While the exact mechanism of backstreaming was not determined, backstreaming undoubtedly is primarily a function of the erup tive boiling characteristics of the vaporizing process. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1963
- Accession Number
- AD0412805
Entities
People
- W.m. Langdon
Organizations
- IIT Research Institute