Effect of Design Parameters and Support Conditions on Natural Frequency of Pipe Excited by a Turbulent Internal Flow

In this study, the effect of design parameters such as pipe diameter, wall thickness, material and fluid velocity on natural frequency fluid-structure interaction in straight conveying fully developed turbulent flow were investigate numerically,analytically experimentally. Also support conditions, simply-simply clamped-clamped was investigated. Experimentally, vibrations characterized by accelerometer mounted wall. The frequencies vibration analyzed using Fast Fourier Transformer (FFT). Five test sections two different diameters 76.2 mm 50.8 with thicknesses 3.7 2.4 materials,stainless steel polyvinyl chloride PVC range Reynolds numbers from 4*104 to 5*105 studied. Mathematically, governing continuity momentum equations solved numerically finite volume method compute characteristics dimensional flow. dynamics a described Transfer Matrix Method (TMM) which is provides numerical technique for solving clamped supports. results showed that,the increase diameter slightly increases thickness increase. Also, supported are higher than those pipe.