Authors: M.R. Mokhtarzadeh-Dehghan, L. Yu, D.J. Stephens
Addresses: Department of Mechanical Engineering, Brunel University, Middlesex UB8 3PH, UK. ' Department of Mechanical Engineering, Brunel University, Middlesex UB8 3PH, UK. ' Department of Mechanical Engineering, Brunel University, Middlesex UB8 3PH, UK
Abstract: The paper describes a numerical study of turbulent flow through an orifice plate restricted by an obstruction of conical shape at its centre. Such a situation occurs in flow metering devices which work on the principle of variable flow area rather than fixed area, as in simple orifice plate meters. The governing differential equations of continuity and momentum and the equations for the k-ε model of turbulence are solved using a finite element method. The velocity and pressure fields and the variation of pressure along the pipe wall are presented. The results show a significant rise in the irrecoverable pressure loss which may reduce the advantage of the meter over simple orifice meters in practice. For comparison, the flow field for a simple orifice plate of the same overall geometry has also been presented. The discharge coefficient for this latter case has been predicted with an error of about 1%, compared with published empirical data.
Keywords: numerical modelling; turbulent flow; variable area orifice meters; flow metering; finite element method; FEM; velocity field; pressure field.
International Journal of Computer Applications in Technology, 1998 Vol.11 No.3/4/5, pp.271 - 280
Published online: 01 Jun 2014 *Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article