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The Design of Ventricular Assist Devices and Analysis of Blood Flow Within them

Tabrizchi, Zahra | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53104 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Ahmadian, Mohammad Taghi; Afshin, Hossein
  7. Abstract:
  8. Heart is a muscular organ, which pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste to the lungs. Heart is sort of like a pump, or two pumps in one. The right side of heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. However, in end-stage heart failure, the heart can no longer pump enough blood to meet the body’s needs, in which case implantable left ventricular assist devices provide support for patients at risk of death from end-stage heart failure.Centrimag blood pump, is a continuous flow second generation ventricular assist device, which includes a free-floating magnetically levitated rotor for a contact-free environment.Computational fluid dynamic (CFD) solutions for blood flow in centrimag pump is performed in Comsol Multiphysics 5.4. The blood flow is assumed to be steady-state and Newotonian. The simulations is conducted under different rotational speed and flow rates, and its effects on blood flow are investigated. The results of numerical simulation of blood flow in Centrimag are compared with the experimental results.Furthermore, the velocity, pressure and shear stress profiles of the Centrimag pump have been studied. Examination of the velocity profile in the CentriMag centrifugal pump indicates that there is a possibility of flow separation in the outlet areas of the pump, which may cause thrombosis in these areas. Also, study of the pressure in the Centrimag shows that the Centrimag has the ability to create the static head needed to pump the blood throughout the body. On the other hand, the normalized index of Hemolysis (NIH) is also calculated in this simulation, which the results shows that the Cnetrimag blood pump causes the least damage to the blood
  9. Keywords:
  10. Ventricular Assist Device ; COMSOL Software ; Heart Pump ; Blood Circulation ; Velocity Profile ; Centrimag Pump

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