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The Scientific World Journal - Volume 2015 2015, Article ID 649098, 10 pages -

Research Article

Hydraulic Machinery Department, Mechanical Faculty, “Politehnica” University of Timisoara, Boulevard Mihai Viteazul No. 1, 300222 Timisoara, Romania

Center for Advanced and Fundamental Technical Research CAFTR, Romanian Academy, Timisoara Branch, Boulevard Mihai Viteazul No. 24, 300223 Timisoara, Romania

Received 24 February 2015; Accepted 7 June 2015

Academic Editor: Dean Deng

Copyright © 2015 C. Velescu and N. C. 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 motion of viscous and incompressible liquids in the annular space of controllable hydraulic resistances with a cylindrical linear slide-valve. This theoretical study focuses on the turbulent and steady-state motion regimes. The hydraulic resistances mentioned above are the most frequent type of hydraulic resistances used in hydraulic actuators and automation systems. To study the liquids’ motion in the controllable hydraulic resistances with a linear cylindrical slide-valve, the report proposes an original analytic method. This study can similarly be applied to any other type of hydraulic resistance. Another purpose of this study is to determine certain mathematical relationships useful to approach the theoretical functionality of hydraulic resistances with magnetic controllable fluids as incompressible fluids in the presence of a controllable magnetic field. In this report, we established general analytic equations to calculate i velocity and pressure distributions, ii average velocity, iii volume flow rate of the liquid, iv pressures difference, and v radial clearance.

Autor: C. Velescu and N. C. Popa

Fuente: https://www.hindawi.com/


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