Hydrodynamic interaction between a fixed and a moving cylinder

by Kazi, Hassan Imam

Abstract (Summary)
(Uncorrected OCR) Abstract of thesis entitled "Hydrodynamic interaction between a fixed and a moving cylinder" submitted by Imam, Kazi Hassan for the degree of master of philosophy at the University of Hong Kong in August, 1995. The present experimental investigation concerns hydrodynamic interaction phenomenon between two bodies in fluid. It is a basic study of two-body problem. It focuses on the interaction phenomenon that takes place when a cylinder, rectangular or circular, is convected by the free stream toward another fixed circular cylinder. Emphasis is given over the effect of interaction on the velocity of the floating cylinder and the resulting force on the fixed cylinder. Cylinders of three geometric shapes, i.e. rectangular, circular and square, and six sizes are used as floating cylinder in combination with one fixed circular cylinder. The floating cylinders are made up of wood, PVC and Plexiglas. The fixed cylinder's material is Nylon. A load balance is designed to measure the force on the fixed cylinder. Details of its design and calibration are given. Video recording of the floating cylinder's motion is used to measure the change in its velocity. Details of the technique are provided. Expected interaction force on the fixed cylinder and retardation of the floating cylinder's velocity are found to exist, These quantities are studied in terms of the gap distance between the floating and the fixed cylinders as well as time. The change in velocity of the floating cylinder is found to agree well with the theoretical result. The force on the fixed cylinder is somewhat less than expected in the near field while it seems to agree in the far field though it is not absolutely conclusive due to the presence of noise in the force signals. The reason for the discrepancy in the results obtained in the near field is attributed mainly to viscous effects and the reason for the noises is attributed to different sources of vibration.
Bibliographical Information:


School:The University of Hong Kong

School Location:China - Hong Kong SAR

Source Type:Master's Thesis



Date of Publication:01/01/1996

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