EVALUATION OF POROUS MATERIALS AS MOLECULAR LEAKS,
Abstract
From the experimental results obtained, adsorption effectively makes Knudsen's flow theory inadequate for predicting the conductance of a molecular leak. This necessitates calibrating the molecular leak for each gas or vapor that will be used. Of the four types of leaks tested, porous glass and porous stainless steel offer the best possibilities for use as molecular leaks at relatively high pressures (100-760) TORR). A leak fabricated from porous glass exhibits molecular flow up to atmospheric pressure. For a conductance of 0.00001 liters/sec for N2, the over-all length of the leak is approximately 8 in. with an OD of 15/32 in. The leak is easily contaminated and has a great affinity for water vapor and other vapors. It is difficult to mount and easily broken.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1964
- Accession Number
- AD0602922
Entities
People
- A. J. Mathews
Organizations
- Arnold Engineering Development Complex