Abstract
The non-physiologic turbulent flows in centrifugal rotary blood pumps (RBPs) may result in complications such as the hemolysis and the platelet activation. Recent researches suggest that the turbulent viscous dissipation in the smallest eddies is the main factor of the blood trauma caused by the turbulent flow. The turbulent viscous shear stress (TVSS) was taken as the realistic physical force acting on the cells. However, limited by the temporal and spatial resolutions of the instrumentation currently available, very limited studies are available for the TVSS in the RBPs. In this paper, the large eddy particle image velocimetry (PIV) method is used to estimate the turbulent dissipation rate in the sub-grid scale, to investigate the effect of the TVSS on the blood trauma. Detailed flow characteristics, such as the relative velocity vectors, the estimated TVSS levels and the Kolmogorov length scales, are analyzed in three impeller phases at three constant flow rates (3 L/min, 5 L/min and 7 L/min). Over the measures range in this study, the maximum TVSS in the investigated RBP is lower than the reported critical value of stress. This study demonstrates that the large eddy PIV method is effective to evaluate the flow-dependent force on the cells. On the other hand, it is found that the TVSS is highly dependent on the flow behavior. Under severe off-design conditions, the complex flow characteristics, such as the flow separation and the vortical structures, will increase the TVSS. Thus, in order to reduce the hemolysis in the RBPs, the flow disturbance, induced by the departure of the incidence angle, should be avoided during the design of the RBPs.
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Acknowledgements
This work was supported by the Prince Charles Hospital Foundation (Grant No. PRO2014-08), the National Health and Medical Research Council Centre for Research Excellence (Grant No. APP1079421), the Tsinghua National Laboratory for Information Science and Technology and the independent research fund of Tsinghua University (Grant No. 20141081265).
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Project supported by the National Natural Science Foundation of China (Grant No. 51536008), the National Key R&D Program of China (Grant No. 2018YFB0606101).
Biography: Jing-jing Ji (1990-), Female, Ph. D.
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Ji, Jj., Li, Hy., Wu, Qy. et al. Estimation of the turbulent viscous shear stress in a centrifugal rotary blood pump by the large eddy particle image velocimetry method. J Hydrodyn 32, 486–496 (2020). https://doi.org/10.1007/s42241-020-0036-y
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DOI: https://doi.org/10.1007/s42241-020-0036-y