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The Scientific World Journal
Volume 2014, Article ID 478401, 10 pages
Research Article

Laminar Motion of the Incompressible Fluids in Self-Acting Thrust Bearings with Spiral Grooves

1Hydraulic Machinery Department, Mechanical Faculty, “Politehnica” University of Timisoara, Boulevard Mihai Viteazul No. 1, 300222 Timisoara, Romania
2Center for Advanced and Fundamental Technical Research (CAFTR), Romanian Academy-Timisoara Branch, Boulevard Mihai Viteazul No. 24, 300223 Timisoara, Romania

Received 4 October 2013; Accepted 28 November 2013; Published 2 January 2014

Academic Editors: M. Kuciej, F. Liu, and L. Nobile

Copyright © 2014 Cornel Velescu and Nicolae Calin Popa. 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.


We analyze the laminar motion of incompressible fluids in self-acting thrust bearings with spiral grooves with inner or external pumping. The purpose of the study is to find some mathematical relations useful to approach the theoretical functionality of these bearings having magnetic controllable fluids as incompressible fluids, in the presence of a controllable magnetic field. This theoretical study approaches the permanent motion regime. To validate the theoretical results, we compare them to some experimental results presented in previous papers. The laminar motion of incompressible fluids in bearings is described by the fundamental equations of fluid dynamics. We developed and particularized these equations by taking into consideration the geometrical and functional characteristics of these hydrodynamic bearings. Through the integration of the differential equation, we determined the pressure and speed distributions in bearings with length in the “pumping” direction. These pressure and speed distributions offer important information, both quantitative (concerning the bearing performances) and qualitative (evidence of the viscous-inertial effects, the fluid compressibility, etc.), for the laminar and permanent motion regime.