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Unsteady vacuum gas flow in cylindrical tubes
dc.creator | Lihnaropoulos, J. | en |
dc.creator | Valougeorgis, D. | en |
dc.date.accessioned | 2015-11-23T10:38:02Z | |
dc.date.available | 2015-11-23T10:38:02Z | |
dc.date.issued | 2011 | |
dc.identifier | 10.1016/j.fusengdes.2011.02.005 | |
dc.identifier.issn | 0920-3796 | |
dc.identifier.uri | http://hdl.handle.net/11615/30361 | |
dc.description.abstract | The starting gas flow in a cylindrical channel is investigated in the whole range of the Knudsen number by numerically solving the governing time dependent kinetic equations in a fully deterministic manner. The gas is initially at rest and then due to a suddenly imposed uniform pressure gradient, is starting to flow. The motion is time dependent up to the point where the steady-state flow conditions are recovered. The flow field is modeled by the linearized unsteady BGK equation subject to Maxwell purely diffuse boundary conditions. The solution provides a detailed description of the evolution of the flow field with regard to time from the starting point, where the gas is at rest up to a certain time where almost steady-state conditions are recovered. Based on the results some insight of how rapidly a vacuum flow will respond to a sudden change, related to an externally imposed pressure gradient coming from a vacuum pump or a valve, is obtained. The total time to recover the stationary solution in terms of the rarefaction parameter exhibits a minimum close to the well known Knudsen minimum. (C) 2011 Elsevier B.V. All rights reserved. | en |
dc.source | Fusion Engineering and Design | en |
dc.source.uri | <Go to ISI>://WOS:000297824000132 | |
dc.subject | Kinetic theory | en |
dc.subject | Rarefied gas dynamics | en |
dc.subject | Vacuum flows | en |
dc.subject | Knudsen number | en |
dc.subject | KNUDSEN NUMBER | en |
dc.subject | WHOLE RANGE | en |
dc.subject | Nuclear Science & Technology | en |
dc.title | Unsteady vacuum gas flow in cylindrical tubes | en |
dc.type | journalArticle | en |
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