Numerical Simulation And Optimization Of Shell And Tube Heat Exchanger Based On Fluent

With the growing of global energy crisis, people pay more and more attention to the secondary use of energy, as an important energy exchange equipment, heat exchanger has been widely used in various industries. The traditional single segmental baffle shell and tube heat exchanger is the most widely used heat exchange equipment and get the highest market occupancy. But due to the shell side flow are prone to form the dead zone, the thermal efficiency is low. Because of the baffle, fluid has a strong transverse impact on tube bundles, and that causes the vibration of tube bundles, make noise and reduce the reliability of the heat exchanger, and even destroy it. In order to fix the deficiencies of the single segmental baffle shell and tube heat exchanger, people put forward various new baffles, but most of them are too hard to produce, and the payment of use and maintenance is also too expensive. Besides that, the researches and use of high-ed heat exchangers are more concentrated in the developed countries, and the research in our country is kind of slowly, also the use of it is limited. Hence, finding a new efficient baffle heat exchanger gets great significance.Based on the discussions about structure and properties of shell and tube heat exchanger we use now, two new baffle heat exchangers are proposed: Y style and T style.In this paper, we use ANSYS Workbench to create the geometric model and finite element model of the single segmental, Y style and T style baffle shell and tube heat exchanger, then solve the problems by fluid analysis software Fluent.The paper simulates the shell side fluid flow state of the heat exchanger under different fluid inlet velocity and compares the performances in shell side fluid of three different baffle heat exchangers, such as pressure, temperature, speed, Nu and f. To Y style baffle shell and tube heat exchanger, this paper studies the angle of Y style that influence on the performances of shell side. The paper analysis three different angle(30 degree,50 degree,70 degree) and gets the shell side fluid flow states. To T style baffle shell and tube heat exchanger, this paper also analysis three different forms of fins(smooth, triangle, rectangle), gets fluid flow states and discuss the influence of the surface conditions on heat exchanger performances. From what has been discussed above, the paper shows that T style baffletube shell and heat exchanger gets the best performance.For T style baffle shell and tube heat exchanger, this paper uses numerical processing software MATLAB to fit out the criterion equations of shell side fluid flow. Then, use Design Exploration multi-objective optimization tool to optimize the structure of T style baffle.By the paper research work, a primary introduction of Y style and T style baffle shell and tube heat exchanger is built. Considering the advantages that the traditional single segmental baffle shell and tube heat exchanger and other new baffle tube heat exchanger do not have, the Y style and T style baffle shell and tube heat exchanger will have widely application prospect in the future.