The problem analysed in this thesis was the shape of narrowing pipe. The goal was to find out how does the narrowing shape influence the flow development before and after the pipe narrowing. Two shapes were analysed: conical and sharp-edged. After determination of the shapes, calculations in CFD program Ansys were performed. These calculations were done with various geometries and Reynolds numbers. Some charts were plotted and distances from the pipe narrowing to the point where flow was fully developed were measured. Finally, the results were compered and figured out. The influence of each parameter on the flow development was discussed. At the conical narrowing the distance before the narrowing was getting greater with the larger angle of the narrowing. After the narrowing that does not influence but the distance is dependent on Reynolds number. The higher the Reynolds number is, greater is the distance. At the sharp-edged narrowing the distance before the narrowing is dependent on ratio between the diameter of narrower and wider pipe. The smaller the ratio is, greater is the distance. After the narrowing both, Reynolds number and the diameter ratio influence on the distance of fully developed flow. At higher Reynolds number and the smaller ratio, the distance is greater.
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