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Computational fluid dynamics analysis and PIV validation of a bionic vortex flow pulsatile LVAD

Issue title: Papers from the 3rd International Conference on Biomedical Engineering and Technology (iCBEB 2014), 25–28 September 2014, Beijing, China

Subtitle:

Guest editors: Edward J. Ciaccio

Article type: Research Article

Authors: Xu, Liang | Yang, Ming* | Ye, Lin | Dong, Zhaopeng

Affiliations: Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai, China

Correspondence: [*] Corresponding author: Ming Yang, Department of Instrument Science and Engineering, Shanghai Jiao Tong University, Shanghai 200237, China. Tel./Fax: +86 021 3420 4197; E-mail:[email protected]

Keywords: Bionic vortex flow, left ventricular assist device, computational fluid dynamics, particle image velocimetry

DOI: 10.3233/THC-150981

Journal: Technology and Health Care, vol. 23, no. s2, pp. S443-S451, 2015

Published: 2015
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Abstract

BACKGROUND: Hemocompatibility is highly affected by the flow field in Left Ventricular Assistant Devices (LVAD).

OBJECTIVE: An asymmetric inflow and outflow channel arrangement with a 45° intersection angle with respect to the blood chamber is proposed to approximate the vascular structure of the aorta and left atrium on the left ventricle. The structure is expected to develop uninterruptible vortex flow state which is similar to the flow state in human left ventricle.

METHODS: The Computational Fluid Dynamics (CFD) asymmetric model is simulated using ANSYS workbench. To validate the velocity field calculated by CFD, a Particle Image Velocimetry (PIV) experiment is conducted.

RESULTS: The CFD results show that the proposed blood chamber could generate a shifting vortex flow that would be redirected to the aorta during ejection to form a persistent recirculating flow state, which is similar to the echocardiographic flow state in left ventricle. Both the PIV and the CFD results show the development of a persistent vortex during the pulsatile period. Comparison of the qualitative flow pattern and quantitative probed velocity histories in a pulsatile period shows a good agreement between the CFD and PIV data.

CONCLUSION: The goal of developing persistent quasi intra-ventricle vortex flow state in LVAD is realized.

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