Cardiovascular Engineering and Technology

, Volume 6, Issue 3, pp 230–241 | Cite as

Classification of Unsteady Flow Patterns in a Rotodynamic Blood Pump: Introduction of Non-Dimensional Regime Map

  • Fangjun Shu
  • Stijn Vandenberghe
  • Jaclyn Brackett
  • James F. Antaki
Article

Abstract

Rotodynamic blood pumps (also known as rotary or continuous flow blood pumps) are commonly evaluated in vitro under steady flow conditions. However, when these devices are used clinically as ventricular assist devices (VADs), the flow is pulsatile due to the contribution of the native heart. This study investigated the influence of this unsteady flow upon the internal hemodynamics of a centrifugal blood pump. The flow field within the median axial plane of the flow path was visualized with particle image velocimetry (PIV) using a transparent replica of the Levacor VAD. The replica was inserted in a dynamic cardiovascular simulator that synchronized the image acquisition to the cardiac cycle. As compared to steady flow, pulsatile conditions produced periodic, transient recirculation regions within the impeller and separation in the outlet diffuser. Dimensional analysis revealed that the flow characteristics could be uniquely described by the non-dimensional flow coefficient (Φ) and its time derivative (\(\dot{\Phi }\)), thereby eliminating impeller speed from the experimental matrix. Four regimes within the Φ–\(\dot{\Phi }\) plane were found to classify the flow patterns, well-attached or disturbed. These results and methods can be generalized to provide insights for both design and operation of rotodynamic blood pumps for safety and efficacy.

Keywords

Ventricular assist devices (VAD) Rotodynamic pumps Continuous flow Pulsatile flow Particle image velocimetry (PIV) Flow coefficient Regime map 

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Copyright information

© Biomedical Engineering Society 2015

Authors and Affiliations

  • Fangjun Shu
    • 1
    • 2
  • Stijn Vandenberghe
    • 1
    • 3
  • Jaclyn Brackett
    • 1
  • James F. Antaki
    • 1
  1. 1.Department of Biomedical EngineeringCarnegie Mellon UniversityPittsburghUSA
  2. 2.Department of Mechanical and Aerospace EngineeringNew Mexico State UniversityLas CrucesUSA
  3. 3.ARTORG Center for Biomedical ResearchUniversity of BernBernSwitzerland

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