Analysis On Fluid-Induced Vibration And Heat Transfer Of Helical Elastic Tube Bundles

The study on fluid-induced vibration of helical elastic tube bundles (HETBs) to enhance heat transfer is of great significance in industrial production and energy utilization. The fluid-induced vibration response and the heat transfer property of a HETB heat exchanger were analyzed by using a two-way fluid-solid coupling method. The vibration frequency, displacement amplitude, and heat transfer coefficient were computed while considering varying entrance velocities and helix diameters. Numerical results demonstrate that the middle of the HETB vibrates the most violently, and the vibration is mainly in the vertical direction. There are a large number of vortices in the gaps between the tubes and the inner cavity of the heat exchanger. The vibration amplitude and heat transfer coefficient of the HETB increase significantly when the entrance velocity or helix diameter increases. The effect of vibration-enhanced heat transfer improves with the increase in entrance velocity. The mean value of the heat transfer coefficient at the upper side of the HETBs is 2.205 times that at the lower side.