Abstract
For the efficiency and durability of heat exchangers, flow-induced vibration analysis is essential. The present work is in the same direction to study the dynamics of a flexible heat exchanger tube of an inline square array conveying steady/pulsatile flow and subjected to cross-flow. The motion of the tube is modelled using Euler-Bernoulli beam theory while the internal and cross-flows are modelled with plug-flow and quasi-steady model, respectively. Galerkin discretization and Runge-Kutta time integration were used to solve the governing delay-differential equation of motion. Results revealed that the internal steady flow amplifies the periodic oscillations of cross-flow-induced flutter of the tube while it reduces the critical cross-flow velocity and flutter frequency. These variations are negligible for a rise in internal flow velocity. For the supercritical cross-flow velocities, the internal flow pulsation induces quasi-periodic oscillations. For other cross-flow velocities, the time delay effect eliminates the parametric instability due to the internal pulsatile flow.
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Reddy, R.S., Gupta, A., Panda, S. (2022). Nonlinear Dynamics of Cross-flow Heat Exchanger Tube Conveying Fluid. In: Lacarbonara, W., Balachandran, B., Leamy, M.J., Ma, J., Tenreiro Machado, J.A., Stepan, G. (eds) Advances in Nonlinear Dynamics. NODYCON Conference Proceedings Series. Springer, Cham. https://doi.org/10.1007/978-3-030-81162-4_1
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