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dc.contributor.authorTsui, Yeng-Yungen_US
dc.contributor.authorJung, Shiaugh-Pingen_US
dc.date.accessioned2014-12-08T15:15:24Z-
dc.date.available2014-12-08T15:15:24Z-
dc.date.issued2006-11-06en_US
dc.identifier.issn0042-207Xen_US
dc.identifier.urihttp://dx.doi.org/10.1016/j.vacuum.2005.09.008en_US
dc.identifier.urihttp://hdl.handle.net/11536/11559-
dc.description.abstractIn this study the numerical method is employed to examine the flow in pumps with spiral grooves. A methodology suitable for the use of unstructured grids is developed. In order to have the greatest feasibility, the governing equations are formulated in such a manner that the grids are allowed to rotate with the rotor. Different from common practices, pressures are specified on the inlet and the outlet boundaries. Therefore, special treatments are required to calculate the mass flow rate and the inlet and outlet velocities. The methodology developed here is assessed via comparison with existing measurements and good agreement is obtained. Examination of pump parameters reveals that in order to obtain maximum flow rate, both the spiral angle and the groove height need to be carefully determined. The force balance over the entire flow channel shows that for a fixed pressure rise across the pump, the pressure difference between side walls is proportional to tangent of the spiral angle and the groove width, but inversely proportional to the groove height and the rotor length. These relationships can roughly be seen in the calculated results. (c) 2005 Published by Elsevier Ltd.en_US
dc.language.isoen_USen_US
dc.subjectmolecular pumpsen_US
dc.subjectgrooved pumpsen_US
dc.subjectslip flowsen_US
dc.subjectpressure boundary conditionsen_US
dc.subjectunstructured gridsen_US
dc.titleAnalysis of the flow in grooved pumps with specified pressure boundary conditionsen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/j.vacuum.2005.09.008en_US
dc.identifier.journalVACUUMen_US
dc.citation.volume81en_US
dc.citation.issue4en_US
dc.citation.spage401en_US
dc.citation.epage410en_US
dc.contributor.department機械工程學系zh_TW
dc.contributor.departmentDepartment of Mechanical Engineeringen_US
dc.identifier.wosnumberWOS:000242527300001-
dc.citation.woscount5-
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