NAFEMS International Journal of CFD Case Studies

Volume 13, September 2023

ISSN 1462-236X
ISBN 978-1-83979-059-1

Low Reynolds number pressure-flow analysis across a valve: Comparison between three-point and multipoint gap functions with CFD results

A. Gopinathan, V. Vipin Dev, R. Jithu Raj, M. S. Subhash Kumar,L. J. Sukanya, C. V. Muraleedharan
Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences & Technology, India

https://doi.org/10.59972/a6nnyn43

Keywords: Valve, Pressure Drop, Analytical Models, CFD Results, Low Reynold’s number flow, Navier Stokes Equation, Boundary Conditions, Fluid Properties, Lubrication Theory

Abstract

The pressure-flow characteristics of a valve that are used in major medical and industrial applications depend on the structural properties of the valve components, properties of the fluid flowing across the valve as well as the profile of the bounding region ensured by the valve-plug (moving part of the valve) and valve-seating (fixed inlet port of valve). The pressure-flow behaviour is an important aspect as far as the design of the valve is considered. The pressure difference between the inlet and outlet of the valve at a particular flow rate could either be estimated through the method of Computational Fluid Dynamics (CFD) or mathematical analytical methods. An analytical model is being developed derived from the Navier Stokes equation in which the boundary profile equations contributed by valve-plug and valve-seating along with fluid properties were being used along with the fluid parameters. As part of the exercise, the gap function which is variation in distance between the plug and seating profile along the flow direction is derived. Two different methods which are a three-point method of circular arc extraction and multipoint method of polynomial curve extraction have been discussed in this paper for obtaining the gap function. The analytical

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Cite this paper

A. Gopinathan, V. Vipin Dev, R. Jithu Raj, M. S. Subhash Kumar,L. J. Sukanya, C. V. Muraleedharan, Low Reynolds number pressure-flow analysis across a valve: Comparison between three-point and multipoint gap functions with CFD results, NAFEMS International Journal of CFD Case Studies, Volume 13, 2023, Pages 59-79, https://doi.org/10.59972/a6nnyn43