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The Ventricular Assist Devices (VADs) are being used to auxiliary the blood circulation in clinical situation where the blood pumped by the ventricle doesn't attend the demand of patient. During the use of VADs there is the probability of occur thrombosis and hemolysis due to stagnation regions and high shear stress in flow. Therefore, the study of velocity flow field inside the VAD is essential for developing of a device to long using. This study can be made through the optics technique called of Particle Image Velocimetry, which consists in the determination of flow displacement through light scattering pattern by particles suspended in the fluid. In this work, a Particle Image Velocimetry was developed to study VADs with beating frequencies up to 30 bpm. The scattering pattern was obtained through particles that were added to fluid and illuminated by an Argon laser source (2W). Images were captured with a CCD acquisition system and velocity distributions are obtained from cross correlation method. |
