Graduate Thesis Or Dissertation
 

Fluid forces on and flow configurations around a circular cylinder near a plane boundary

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6h440w56f

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  • The flow configurations around and the forces acting on a circular cylinder with its axis parallel to a nearby plane boundary and subjected to a uniform flow were investigated. The flow conditions, which were perpendicular to the cylinder axis and parallel to the plane boundary were investigated experimentally and theoretically. Flow visualization was achieved through the use of tiny air bubbles entrapted in the fluid to locate the stagnation point and point of separation of flow. Also, the configuration of the cylinder wake was observed. A force measuring device employing the use of straingauges was used to record the change in lift and drag as the cylinder neared the plane boundary. The results showed that the drag and lift increased, and that the cylinder wake approximated that of an aerofoil configuration as the cylinder neared the plane boundary. In addition, as the cylinder approached the plane boundary, the top separation point of the cylinder boundary layer moved towards the front of the cylinder, the bottom separation point moved towards the rear of the cylinder, and the front stagnation point moved downward. The boundary layer along the plane boundary was observed to separate at a position downstream of the test cylinder. This separation point position was determined to be a function of the distance between the cylinder and the plane boundary for a specific Reynolds number.
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file details TavolacciDon1975.pdf 2017-08-14 Pubblico Scaricare