The helicoid multi-groove frictional pump as a direct compressor in the atmosphere under re-examination of the coefficient of the internal viscosity

When a helicoid multi-grove frictional pump is set to work in pressures und er 1 atm (including completely the viscous state) in such a way that it is able to compress automatically on the air, the shortening of its length bec omes more intensive and a necessary task. Because of that we re-examine the behavior of the coefficient of internal viscosity of a given gas in the in terval of pressures between zero and one atmosphere(0 less than or equal to p less than or equal to less than or equal to 1 atm). The existing two reg ions become united and thus a better approach is presented. (C) 1999 Publis hed by Elsevier Science Ltd. All rights reserved.