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Experimental investigation on flow perturbations coupled with tube vibrations along the interstitial flow path are presented. A Normal Triangular tube arrays at different operating conditions with a pitch ratio of 1.85 was calculated. Interstitial flow perturbations Measurements all along the flow path were recorded by means of a hot-wire probe while monitoring the tube vibration in the stream wise and cross flow directions. A single flexible tube located in the centre of a rigid array was equipped with pressure transducers to observe the surface pressure deviation. The amplitude of flow perturbation and phase with respect to the tube vibrations were acquired at a number of positions alongside the flow path in the array. The consequence of tube vibration amplitude, mean gap velocity frequency, and measurement position of the hot wire probe on the amplitude of the flow perturbation and comparative phase were examined. It is observed that the perturbations of the fluid flow are primarily evident at the position of separation of the fluid flow from the test tube and decay swiftly with space from this position. It shows that the time delay between tube vibration and perturbation of the flow is associated with separation of the flow and enhanced vortices resulted due to the tube vibration.

Experimental investigation on stability of an elastically mounted circular tube under cross flow in normal triangular arrangement