INVESTIGATION ON FLOW INDUCED VIBRATION EXCITATION AND STABILITY OF AN ELASTICALLY MOUNTED CIRCULAR TUBE PLACED IN ROTATED SQUARE AND PARALLEL TRIANGULAR ARRAY

摘要

The outcome of an experimental study on flow perturbations coupled with excitation of the test tube all along the interstitial flow path is presented. Tubes arranged in rotated square and Rotated square and Parallel triangular at various operating conditions with a pitch ratio of 1.75 was considered. Measurements of Interstitial fluid flow distresses on the flow path were documented by means of a hot wire anemometer at the same time as monitoring the tube vibration in the stream wise and cross flow directions. The amplitude due to flow distresses and phase with respect to the vibration of test tube measured at multiple positions alongside the flow path in the array. The significance of tube vibration amplitude, mean gap velocity frequency, and measurement position of the hot wire probe on the amplitude of the flow distresses and comparative phase were examined. It is experiential that the distresses of the fluid flow are mostly evident at the position of separation of the fluid flow from the test tube and decay swiftly with space from this position.