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1 Biocybernetics and Biomedical Engineering

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Stereoscopic particle image velocimetry for application in three-dimensional flow within a spiral vortex pulsatile blood pump

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Yagi T. , Yang W. , Ishikawa D. , Iwasaki K. , Umezu M.

2006

tom Vol. 26, no. 2

53-62

There is currently no multidimensional flow diagnostic tool developed which is capable of elucidating 3D complex flow structures in pulsatile ventricular assist devices (VAD). According to recent clinical reports, most VAD may have a persistent risk of thromboembolism even in administration of systematic medical therapy. The present study, therefore, aims to demonstrate the applicability of Stereoscopic ParticIe Image Velocimetry (SPIV) for characterizing highly 3D complex flows within a pulsatile blood pump. SPIV measurements were carried out within a Spiral Vortex pulsatile blood pump (SV pump). In order to assess the measurement accuracy, the results were compared with those obtained with Laser Doppler Anemometry (LDA). In experiments, a full-scale Perspex model of the SV pump was employed. A Newtonian blood-analog fluid was used with the approximately same refractive index as the Perspex. A flow rate was set at 8.3 L/min (Re=2500) under steady conditions. SPIV measurements revealed 3D complex flow characteristics of a steady swirling flow generated within a conical housing. The flow, similar to a model of Rankine vortex, exhibited intricate natures in a three-dimensional manner, particularly in a core region at the swirling center and in the immediate downstream of inlet flow. In measurement comparisons, the results of SPIV measurements were in agreement with those from LDA. These results successfully demonstrated the viability as well as the efficacy of SPIV measurement in investigating 3D complex flows within the SV pump.