Antonio Lippolis

Three-Dimensional Analysis of Flow Forces on Directional Control Valves

Abstract This paper deals with a sufficiently complete analysis of flow forces acting on spools of hydraulic directional control valves. The analysis performed, using the very reliable and commercially widespread “Fluent” code, aims to describe global parameters in order to evaluate such forces with a reasonable accuracy and without performing expensive three-dimensional calculations. To this aim, different fluid dynamics analyses have been carried out inside the valve, starting from simple axis-symmetric models, up to full three-dimensional simulations. A comparison of the 2D and 3D results is then presented.

FLOW PATTERNS AND HEAT TRANSFER AROUND SIX IN-LINE CIRCULAR CYLINDERS AT LOW REYNOLDS NUMBER

The flow field and the heat transfer around six in-line iso-thermal circular cylinders has been studied by mean of numerical simulations. Two values of the center to center spacing (

A Review Analysis of Unsteady Forces in Hydraulic Valves

s=3.6d

Buoyancy Effect on the Flow Pattern and the Thermal Performance of an Array of Circular Cylinders

and

Influence of the Spool Velocity on The Performance of a Directional Hydraulic Valve

4d

Dispersion and Deposition of Particles in Rayleigh-Bénard Turbulent Flows

, where

Flow forces analysis of an open center hydraulic directional control valve sliding spool

d

Evaluation of the flow forces on an open centre directional control valve by means of a computational fluid dynamic analysis

is the cylinder diameter) at Reynolds number of

Large-eddy simulations in mixed-flow pumps using an immersed-boundary method

100

Analysis of a directional hydraulic valve by a Direct Numerical Simulation using an immersed-boundary method

and Prandtl number of