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- W764552008 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." @default.
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- W764552008 date "1999-01-01" @default.
- W764552008 modified "2023-09-23" @default.
- W764552008 title "Pumping Characteristics of a Helical Drag Pump in the Molecular Transition Region" @default.
- W764552008 doi "https://doi.org/10.22634/ksme-b.1999.23.12.1614" @default.
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