JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Pumping Characteristics of a Helical Drag Pump in the Molecular Transition Region
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Pumping Characteristics of a Helical Drag Pump in the Molecular Transition Region
Heo, Jung Sik; U, Nam Seop; Hwang, Yeong Gyu; Kim, Yun Je;
 
 Abstract
Pumping performance of a helical drag pump which works in the pressure range from 0.02 to 5 Torr is studied numerically and experimentally. The flow occurring in the pumping channel is developed from the molecular transition to the slip flow as traveling downstream. Two different numerical techniques are used: the first method is a continuum approach in solving the Navier-Stokes equations with slip boundary conditions, and the second one is a stochastic particle approach through the use of the direct simulation Monte-Carlo method. In the experimental study, the inlet pressures are measured for various outlet pressures of the test pump. Two different types of helical rotor are designed and tested to investigate the effect of geometrical parameters on performance. The rotational speed of the pump is 24000rpm, and nitrogen is used as a test gas. The numerical results show a good agreement with the experimental data.
 Keywords
Helical Drag Pump;Compound Molecular Pump;Throughput;Compression Ratio;Molecular Transition Region;
 Language
Korean
 Cited by
 References
1.
Vacuum Technology and Applications, 1991.

2.
High-Vacuum Technology, 1990.

3.
In Vacuum Science and Technology: Pioneers of 20th century, 1994. pp.126-132

4.
DAIKIN, 0000.

5.
Vacuum, 1990. vol.41. 7~9, pp.2067-2069

6.
Trans. JSME, 1991. vol.57. 533, pp.172-177

7.
Vacuum, 1994. vol.45. 8, pp.841-847

8.
Sci. Papers of the Institute of Physical and Chemical Research, 1976. vol.70. 4, pp.79-86

9.
Bull. JSME, 1979. vol.22. 169, pp.974-981

10.
Bull. JSME, 1986. vol.29. 252, pp.1770-1774

11.
Vacuum, 1990. vol.41. 7~9, pp.1833-1836

12.
Vacuum, 1993. vol.44. 5~7, pp.689-692

13.
대한기계학회논문집(B), 1998. vol.22. 5, pp.640-650

14.
Chemie-Ingenieur Technik, 1959. vol.31. 3, pp.202-212

15.
대한기계학회 추계학술대회논문집B, 1998. pp.747-752

16.
Vacuum Science and Engineering, 1965.

17.
Proc. of the 19th International Symposium of Rarefied Gas Dynamics, 1994. pp.375-381