Experimental study of a model valve with flexible leaflets in a pulsatile flow

2013 ◽  
Vol 739 ◽  
pp. 338-362 ◽  
Author(s):  
R. Ledesma-Alonso ◽  
J. E. V. Guzmán ◽  
R. Zenit
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Pulsatile Flow ◽  
Material Properties ◽  
Heart Valves ◽  
Dynamical Behaviour ◽  
Prosthetic Heart Valves ◽  
Periodic Flow ◽  
Flow Parameters ◽  
Time Periodic

AbstractAn experimental investigation was conducted to study the dynamical behaviour of a model valve in a pulsatile flow. The valve is modelled as a pair of curved, rectangular, flexible leaflets that open and close under a time-periodic flow. Using image analysis, the range of flow parameters for which a valve (of a particular geometry and material properties of the leaflets) works correctly were identified. A correct performance was considered to be when the valve opened in one direction but blocked the flow in the reversed direction. A model is proposed to predict the performance of the valves. Furthermore, an analysis of fluid strains is conducted for valves that operate correctly to identify the influence of the valve’s design on fluid stresses. The main purpose of this investigation is to gain insight for the design of future prosthetic heart valves.

Highly resolved pulsatile flows through prosthetic heart valves using the entropic lattice-Boltzmann method

2014 ◽  
Vol 754 ◽  
pp. 122-160 ◽  
Author(s):  
B. Min Yun ◽  
L. P. Dasi ◽  
C. K. Aidun ◽  
A. P. Yoganathan
Keyword(s):  
Lattice Boltzmann Method ◽  
Pulsatile Flow ◽  
Lattice Boltzmann ◽  
Heart Valves ◽  
Prosthetic Heart Valves ◽  
Spatiotemporal Resolution ◽  
Jude Medical ◽  
High Spatiotemporal Resolution ◽  
Flow Through ◽  
Boltzmann Method

AbstractProsthetic heart valves have been widely used to replace diseased or defective native heart valves. Flow through bileaflet mechanical heart valves (BMHVs) have previously demonstrated complex phenomena in the vicinity of the valve owing to the presence of two rigid leaflets. This study aims to accurately capture the complex flow dynamics for pulsatile flow through a 23 mm St Jude Medical (SJM) Regent™ BMHV. The lattice-Boltzmann method (LBM) is used to simulate pulsatile flow through the valve with the inclusion of reverse leakage flow at very high spatiotemporal resolution that can capture fine details in the pulsatile BMHV flow field. For higher-Reynolds-number flows, this high spatiotemporal resolution captures features that have not been observed in previous coarse resolution studies. In addition, the simulations are able to capture with detail the features of leaflet closing and the asymmetric b-datum leakage jet during mid-diastole. Novel flow physics are visualized and discussed along with quantification of turbulent features of this flow, which is made possible by this parallelized numerical method.

scholarly journals Pulsatile flow studies of prosthetic heart valves

1966 ◽  
Vol 51 (2) ◽  
pp. 264-267 ◽  
Author(s):  
Trevor B. Davey ◽  
Boris Kaufman ◽  
Edward A. Smeloff
Keyword(s):  
Pulsatile Flow ◽  
Heart Valves ◽  
Prosthetic Heart Valves

Laboratory Testing of Prosthetic Heart Valves

1987 ◽  
Vol 16 (2) ◽  
pp. 67-76 ◽  
Author(s):  
H Reul ◽  
M Giersiepen ◽  
E Knott
Keyword(s):  
Steady Flow ◽  
Pulsatile Flow ◽  
Laboratory Testing ◽  
Heart Valves ◽  
Fatigue Testing ◽  
Comparative Test ◽  
Prosthetic Heart Valves ◽  
Test Results ◽  
Testing Methods

A whole range of laboratory testing methods for prosthetic heart valves, such as steady flow testing, pulsatile flow testing, and fatigue testing, are presented. Comparative test results for various valve types are given and relative valve performance is discussed.

In-Vitro Pulsatile Flow Testing of Prosthetic Heart Valves: A Round-Robin Study by the ISO Cardiac Valves Working Group

2019 ◽  
Vol 10 (3) ◽  
pp. 397-422 ◽  
Author(s):  
Changfu Wu ◽  
Neelakantan Saikrishnan ◽  
Aaron J. Chalekian ◽  
Rob Fraser ◽  
Ornella Ieropoli ◽  
...  
Keyword(s):  
Pulsatile Flow ◽  
Working Group ◽  
Heart Valves ◽  
Round Robin ◽  
Prosthetic Heart Valves ◽  
Cardiac Valves

An Experimental Study of the Flow-Induced Mass Transfer Distribution in the Vicinity of Prosthetic Heart Valves

1981 ◽  
Vol 103 (1) ◽  
pp. 1-10 ◽  
Author(s):  
F. L. Galanga ◽  
J. R. Lloyd
Keyword(s):  
Mass Transfer ◽  
Experimental Study ◽  
Heart Valves ◽  
Electrochemical Techniques ◽  
Reynolds Numbers ◽  
In Vivo Studies ◽  
High Mass ◽  
Prosthetic Heart Valves ◽  
Disk Valve

An experimental study of the flow-induced mass transfer distribution in the vicinity of a model disk valve and a ball valve was conducted using electrochemical techniques. Reynolds numbers ranged from 1000 to 6000, which are characteristic of physiologic conditions. Local instantaneous and time average data are presented. It was found that the flow-induced mass transfer distribution was high in regions of both low and high shear. It was also demonstrated that the fluctuations in the mass transfer to the wall of the test section around the valve are significantly affected by valve design. The regions of high mass transfer measured in this study were found to correlate very closely to regions where thrombus formations have been documented in in-vivo studies.

scholarly journals The use of ancrod to prevent thrombosis on prosthetic heart valves: An experimental study

Thorax ◽  
1970 ◽  
Vol 25 (4) ◽  
pp. 472-476 ◽  
Author(s):  
M. P. Singh ◽  
H. H. Bentall ◽  
W. R. Bell ◽  
E. G. J. Olsen ◽  
S. P. Allwork
Keyword(s):  
Experimental Study ◽  
Heart Valves ◽  
Prosthetic Heart Valves

Computational modelling of flow through prosthetic heart valves using the entropic lattice-Boltzmann method

2014 ◽  
Vol 743 ◽  
pp. 170-201 ◽  
Author(s):  
B. Min Yun ◽  
L. P. Dasi ◽  
C. K. Aidun ◽  
A. P. Yoganathan
Keyword(s):  
Lattice Boltzmann Method ◽  
Numerical Method ◽  
Pulsatile Flow ◽  
Lattice Boltzmann ◽  
Heart Valves ◽  
Prosthetic Heart Valves ◽  
Flow Through ◽  
Leaflet Motion ◽  
High Reynolds ◽  
Boltzmann Method

AbstractPrevious clinical, in vitro experimental and in silico simulation studies have shown the complex dynamics of flow through prosthetic heart valves. In the case of bileaflet mechanical heart valves (BMHVs), complex flow phenomena are observed due to the presence of two rigid leaflets. A numerical method for this type of study must be able to accurately simulate pulsatile flow through BMHVs with the inclusion of leaflet motion and high-Reynolds-number flow modelling. Consequently, this study aims at validating a numerical method that captures the flow dynamics for pulsatile flow through a BMHV. A $23~ \mbox{mm}$ St. Jude Medical (SJM) Regent™ valve is selected for use in both the experiments and numerical simulations. The entropic lattice-Boltzmann method is used to simulate pulsatile flow through the valve with the inclusion of reverse leakage flow, while prescribing the flowrate and leaflet motion from experimental data. The numerical simulations are compared against experimental digital particle image velocimetry (DPIV) results from a previous study for validation. The numerical method is shown to match well with the experimental results quantitatively as well as qualitatively. Simulations are performed with efficient parallel processing at very high spatiotemporal resolution that can capture the finest details in the pulsatile BMHV flow field. This study validates the lattice-Boltzmann method as suitable for simulating pulsatile, high-Reynolds-number flows through prosthetic devices for use in future research.

Sign in / Sign up

Export Citation Format

Share Document