International Journal of Rotating Machinery

International Journal of Rotating Machinery / 2001 / Article

Open Access

Volume 7 |Article ID 829497 | https://doi.org/10.1155/S1023621X01000021

Fong-Zhi Chen, Ming-June Tsai, Yu-Wen Chang, Rong-Yuan Jou, Hong-Ping Cheng, "Using Plücker Coordinates for Pumping Speed Evaluation of Molecular Pump in the DSMC Method", International Journal of Rotating Machinery, vol. 7, Article ID 829497, 10 pages, 2001. https://doi.org/10.1155/S1023621X01000021

Using Plücker Coordinates for Pumping Speed Evaluation of Molecular Pump in the DSMC Method

Received25 Jun 1999
Revised02 Jul 1999

Abstract

In this study, the Plücker coordinates representation is used to formulate the ruled surface and the molecular path for pumping speed performance evaluation of a molecular vacuum pump. The ruled surface represented by the Pliicker coordinates is used to develop a criterion for when gas molecules hit the pump surface wall. The criterion is applied to analyze the flow rate of a new developed vacuum pump in transition regimes by using the DSMC (Direct Simulation Monte Carlo) method. When a molecule flies in a neutral electrical field its path is a straight line. If the molecular path and the generators of a ruled surface are both represented by the Pliicker coordinates, the position of the molecular hit on the wall can be verified by the reciprocal condition of the lines. The Plücker coordinates representation is quite convenient in the DSMC method for this three-dimensional molecular flow simulation.

Copyright © 2001 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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