Analysis of transverse vibration response and heat transfer characteristics of heat exchangers based on elastic structures

To accurately explore the numerical vibration response and heat transfer characteristics of heat exchanger with fluid-solid coupling in the actual working environment. According to the finite volume method and Euler-Lagrange method, the three-dimensional model and mathematical model of coupled vibration are founded. The 0.5 m/s working condition is taken as the experimental object to verify the rationality of the coupling calculation model. Then, bidirectional and unidirectional fluid-solid coupling simulation methods are chosen to resolve the vibration acceleration and heat transfer characteristics of heat exchange tubes at different speeds, and the effects of the two methods on the vibration response of heat exchange tubes are contrasted. Results indicate that under bidirectional coupling, the heat transfer characteristics of the heat exchange tube will experience significant fluctuations due to the vibration of the tube bundle. The shell-side domain has more prominent influence on the vibration of the heat exchange tube when the water velocity is greater than 0.5 m/s. Typical digital features of vibration acceleration and vibration frequency are improved by 110.03%–140.47% and 99.71%–99.88% respectively. The research not only provides a valid analysis approach for fluid-solid coupling vibration of heat exchanger, but also gives theoretical guidance to its vibration optimization design.