Rheological effects on pulsatile hemodynamics in a stenosed tube
type: Item
instance of: scholarly article
title: Rheological effects on pulsatile hemodynamics in a stenosed tube
zbMATH Open document ID: 0992.76103
DOI: 10.1016/S0045-7930(99)00019-5
author: J. R. jun. Buchanan
author: J. K. Comer
author: Clement Kleinstreuer
published in: Computers and Fluids
publication date: 2002-09-11T00:00:00Z
review text: The authors investigate the effect of Womersley number \(Wo\) variation for the input pulse on the transient laminar axisymmetric flow through a tube with a small local occlusion. Three rheological models (Newtonian, power-law and Anemada) of human blood are examined using an experimentally validated control volume method. The results show similar structures of the flow field for all the three models. However, the differences in the interaction between inertial viscous forces have a measurable effect on the wall hemodynamic parameters (i.e. time-averaged wall shear stress, spatial wall shear stress gradient and oscillatory shear index). The primary application is pulsatile flow in axisymmetric stenosed artery segments. The results show that for the highest Womersley numbers considered \((Wo=5-12)\), a second corotating vortex is formed distal to the primary vortex. The shear-thinning rheological models exhibit a secondary effect on the flow field which causes subtle changes in the hemodynamic wall parameters. The entrainment of fluid-like particles in the post-stenotic region is considerably affected by the non-Newtonian models. For all rheologies and Womersley numbers considered, the ratio of transient to steady particle residence time is found to be less than or equal to unity for the majority of fluid elements.
Mathematics Subject Classification ID: 76Z05
Mathematics Subject Classification ID: 76A05
Mathematics Subject Classification ID: 92C10
zbMATH DE Number: 1452891
zbMATH Keywords: pulsatile hemodynamics
zbMATH Keywords: small occlusion
zbMATH Keywords: Womersley number
zbMATH Keywords: laminar axisymmetric flow
zbMATH Keywords: human blood
zbMATH Keywords: control volume method
zbMATH Keywords: wall hemodynamic parameters
zbMATH Keywords: time-averaged wall shear stress
zbMATH Keywords: spatial wall shear stress gradient
zbMATH Keywords: oscillatory shear index
zbMATH Keywords: second corotating vortex
zbMATH Keywords: primary vortex
zbMATH Keywords: shear-thinning rheological models
zbMATH Keywords: non-Newtonian models
zbMATH Keywords: particle residence time
reviewed by: R. Usha
describes a project that uses: CFDLIB
MaRDI profile type: Publication
cites work: Validation of numerical simulation of incompressible pulsatile flow in a constricted channel
cites work: Utilization of Fourier decomposition for analyzing time-periodic flows
cites work: Q3795172
description: scientific article; zbMATH DE number 1452891