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A Study on the Pumping Performance of a Disk-type Drag Pump
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 Title & Authors
A Study on the Pumping Performance of a Disk-type Drag Pump
Hwang, Young-Kyu; Heo, Joong-Sik; Choi, Wook-Jin;
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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 channel develops from the molecular transition to the slip flow traveling downstream. Two different numerical methods are used in this analysis: the first one is a continuum approach in solving the Navier-Stokes equations with slip boundary conditions, and the second one is a stochastic approach through the use of the direct simulation Monte Carlo method. In the experimental study, the inlet pressures are measured for various outlet pressures in the range of 0.14Torr. From the present study, the numerical results of predicting the performance, obtained by both methods, agree well with the experimental data for the range of Knudsen number (i.e., the slip flow regime). But the results from the second method only agree with the experimental data for Kn>0.1(i.e., the molecular transition regime)
Disk-type Drag Pump;Direct Simulation Monte Carlo Method;Molecular Transition Region;Compression Ratio;Throughput;
 Cited by
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