New spiral molecular drag stage design for high compression ratio, compact turbomolecular-drag pumps

S Giors, L Campagna, E Emelli - … of Vacuum Science & Technology A, 2010 - pubs.aip.org
Currently, commercially available turbo-drag pumps for high vacuum systems are based on
either Gaede-or Holweck-type molecular drag pumping stages used in series downstream of …

Molecular transition and slip flows in the pumping channels of drag pumps

JS Heo, YK Hwang - Journal of Vacuum Science & Technology A …, 2000 - pubs.aip.org
Numerical and experimental investigations are performed for the molecular transition and
slip flows in pumping channels of a helical-type drag pump (HTDP) and disk-type drag pump …

An experimental study on the pumping performance of molecular drag pumps

MK Kwon, YK Hwang - Journal of mechanical science and technology, 2006 - Springer
The pumping performance of molecular drag pumps (MDP) has been investigated
experimentally. The experimented MDPs are a disk-type drag pump (DTDP), helical-type …

Spiral channel flows in a disk-type drag pump

JS Heo, YK Hwang - Journal of Vacuum Science & Technology A …, 2001 - pubs.aip.org
Pumping performance of a disk-type drag pump is studied numerically and experimentally.
Molecular transition and slip flows that arise in a spiral channel on the rotating disk are …

A study on the pumping performance of the disk-type drag pumps for spiral channel in rarefied gas flow

MK Kwon, YK Hwang - Vacuum, 2004 - Elsevier
The pumping characteristics of a single-stage disk-type drag pump (DTDP) are calculated
for the variation of the vertical clearance between a rotor and stator by the three-dimensional …

Effect of Vertical Clearance Between a Rotor and Stater of a Disk-Type Drag Pump on the Performance

MK Kwon, YK Hwang - Transactions of the Korean Society of …, 2004 - koreascience.kr
The pumping characteristics of a single-stage disk-type drag pump (DTDP) are calculated
for the variation of the vertical clearance between a rotor and stator by the three-dimensional …

Numerical and experimental investigations of channel flows in a disk-type drag pump

YK Hwang, JS Heo, WJ Choi - AIP Conference Proceedings, 2001 - pubs.aip.org
Pumping performance of a disk-type drag pump is studied numerically and experimentally.
Molecular transition and slip flows that arise in a spiral channel on the rotating disk are …

Performance characteristics of single-stage disk-type drag pump

JS Heo, YK Hwang - Journal of Vacuum Science & Technology A …, 2002 - pubs.aip.org
The direct simulation Monte Carlo (DSMC) method is applied to investigate steady and
unsteady flow fields of a single-stage disk-type drag pump. Two different kinds of pumps are …

A study on the pumping performance of a disk-type drag pump

YK Hwang, JS Heo, WJ Choi - … of the Korean Society of Mechanical …, 2000 - koreascience.kr
Numerical and experimental investigations are performed for the molecular transition and
slip flows in pumping channels of a disk-type drag pump. The flow occurring in the pumping …

Determination of the molecular vacuum pump stage main parameters by the Monte-Carlo method

IM Safronov, EV Svichkar, VS Klucharov - AIP Conference …, 2019 - pubs.aip.org
The problem of determining the conductivity of the channel formed by the wheel blades of a
molecular vacuum pump is set within the framework of the study of the gas flow along curved …