Dynamic Properties of Coupled Tube-Array Structures with the Axial Loads

Abstract

The tube-array structures coupled both with the fluid and the axial load is focused. In a heat exchanger, the tubes are frequently affected by cold and hot fluid shock waves. Thus, tubes are often found to be vibrated and even to be worn out. This vibration may not only alter the performance of the tubes but also introduce the damage in the heat exchanger. In this work, the dynamic properties of coupled tube-array structures with the axial loads are investigated. Futher, the tube-array structures in a heat exchanger, consisting of periodic cooling tubes are also considered to simulate as a coupled periodic structure system. It is found that each tube of the system is weakly coupled to the adjacent tube via water. By using the Galerkin method, the equations of the coupled system with the fluid effect can be derived. Numerical results reveal that the axial load and fluid effects may influence the dynamic properties of a fluid coupled tubearray structures system of a heat exchanger significantly.

Free vibration analysis of nano-tubes consisted of functionally graded bi-semi-tubes by a two-steps perturbation method

“…Among these components, tube is one of the most important and frequently used structural components in many industries. Fig.1 shows some potential fields for functionally graded materials as well as tubes application (Hosseini et al, 2017;Jha et al, 2013;Zhang et al, 2014;Kiani and Eslami, 2013;Kakar, 2013;Djamaluddin et al 2015;Huang et al 2016;Adeli et al 2017;Hadi et al 2018;Shishesaz et al 2017). For efficient use of such components, it is necessary to study its mechanical behaviors like vibration, buckling and bending.…”