Accurate prediction of internal leaks in stationary dry Roots vacuum pumps
✍ Scribed by Laurent-Charles Valdès; Benoı̂t Barthod; Yves Le Perron
- Book ID
- 104266195
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 321 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0042-207X
No coin nor oath required. For personal study only.
✦ Synopsis
There exists a calculating method for internal leaks in dry Roots vacuum pumps. It rests upon the semi-empirical Knudsen-Dong law (Knudsen M, Ann Phys 1909;28:75; Dong W, PhD thesis, Contract no. W-7405-eng-48, University of California, 1956) describing steady rarefied gas flows in the three well-known regimes of flow; the only data input is the geometric contour of the stator and the rotors, and the pressure operating conditions. Using readings taken from a stationary dry Roots pump, it is checked that this calculating method is capable of predicting the conductance of each of the clearances to a few percent, on a pressure range widely covering the transient flow regime.