Study On A Single Elastic Tube Bundle Vibration Induced By Pulsating Flow And Its Heat Transfer

As a new type of heat transfer enhancement technology, fluid induced vibration can realize composite heat transfer enhancement.Elastic tube bundle heat exchanger can make good use of fluid induced vibration and realize heat transfer enhancement. Elastic tube bundle is a kind of composite curved beam structure, it has the approximate characteristics of the spring on the vibration characteristics. And different fluid induced elastic tube bundle vibration, the vibration and the heat transfer characteristics of tube bundle vary widely. Tube bundle’s the vibration and the heat transfer characteristics will be better by studying different fluid induced tube bundle vibration. This paper analys a single tube bundle’s vibration and heat transfer characteristics with ansys under different pulsating flow conditions, and analys the elastic tube bundle’s fatigue strength. And it provides a certain theoretical basis for the tube bundle’s better heat transfer under the premise of the fatigue strength, and provides methods for studying the vibration of multiple rows of the elastic tube bundle. The main contents of the paper are as follows:Take planar elastic tube bundle and conical spiral elastic tube bundle as research objects. The finite element model of elastic tube bundle were created, the natural mode of elastic tube bundle was analyzed based on the workbench numerical simulation. The modes of vibration, natural frequency of the tube bundle were obtained. It provides a basis to study heat transfer characteristics of elastic tube bundle under different inherent vibration modes. Get the similar inherent vibration mode of the elastic tube bundle by using the pulsating flow excitation bundle vibration. Obtain the discipline of heat transfer characteristics of elastic tube bundle under different inherent vibration modes. Compare the heat transfer characteristics between different structure of elastic tube bundles vibration modes, do analysis on the influence of heat transfer of different structure of elastic tube bundle inherent vibration modes.The finite element model of the coupling flow field is established based on shell side field and the pulsating flow field’coupling in heat exchanger.Do analysis on coupling analysis of pulsating flow and shell side flow by using cfx, obtain the speed changes in different position in heat exchanger. And it can provide certain theoretical basis for the position distribution of the elastic tube bundle.On the basis of the research pulsating flow and shell side flow’s coupling analysis, do further research on tube bundle’s vibration and heat transfer characteristics, obtain tube bundle’s vibration and heat transfer characteristics under the coupling flow field. Compare tube bundle’s vibration and heat transfer characteristics under different flow fields such as shell side flow field, pulsating flow field, the coupling flow field. The results showed that coupling flow field can make heat transfer enhancement better.Change the pulsating flow parameters, such as the pulsating flow amplitude and frequency, the position of pulsating flow, the direction of pulsating flow, get tube bundle’s vibration and heat transfer characteristics’s changing rule. And it can provide certain theoretical basis for the selection of pulsating flow parameters.Analys elastic tube bundle fatigue strength using workbench under different flow field, get flow’ speed when elastic tube bundle’s damage, and it called flow’ critical speed. It can be used as a basis when select the working parameter in elastic tube bundle heat exchanger.