Master Degree / Yüksek Lisans Tezleri
Permanent URI for this collectionhttps://hdl.handle.net/11147/3008
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Master Thesis Design of Centrifugal Blood Pump(01. Izmir Institute of Technology, 2020) Özkol, Ünver; Sarızeybek, Ceren; Özkol, Ünver; 01. Izmir Institute of Technology; 03.10. Department of Mechanical Engineering; 03. Faculty of EngineeringIn this thesis a maglev centrifugal blood pump is studied numerically which will be used in ECMO systems. Aim was to design a pump with 3.3 L/min at 5000 rpm having 200 mmHg head. Pump is designed by SolidWork and CFD studies are applied in Ansys Fluent. Firstly, blade discharge angle values between 20 degree and 40 degree are simulated with 5 degree intervals and 35 degree is found to be the most appropriate for hydraulic efficiency and head. Likewise, six different up-clearance values between 2.0 mm and 0.1 mm are studied to see effect of up-clearance on head and efficiency. Also to predict hemolysis for different up-clearance values, Giersiepen power law hemolysis model with Lagrangian approach is employed. 0.1 mm up-clearance is found suitable. For this up-clearance hemolysis is calculated as 4%.Master Thesis Design and Numerical Analyses of Guide Vanes of a Multistage Submersible Pump(Izmir Institute of Technology, 2019) Demirtaş, Mert; Özkol, Ünver; Özkol, Ünver; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of TechnologyThe objective of this thesis is to analyze a multistage submersible pump numerically, figure out the inefficient sections of flow and propose a modified design according to the simulation results. Hydraulic parts of a submersible pump are impeller, diffuser and return channel. In this study, the investigated pump’s stages have only impellers and return channels. According to the literature, the inefficiencies in pump stages might be caused by angle misalignment of impeller and guide vanes, channel geometries or vane designs. The investigated five stage submersible pump and its CAD models are provided by a manufacturing company. In the first part of the study, fluid domain is created for numerical computations and analyses are performed with ANSYS Fluent software. According to the simulation results, flow nonuniformities are observed in return channels and identified that the reason is guide vane geometry. The second part of the study includes the modified design of guide vane and set of simulations with different wrap angles to find out the optimized value. The simulation results of this thesis study are quite satisfactory when they are compared to experimental data of manufacturing company. After modifications, the nonuniformities which are observed in original design are diminished and efficiency of the pump is increased.