In order to solve the problem of computer resource allocation when simulating large heat exchange equipment with CFD software,a modular model finite element simulation method is proposed to calculate large flow field equipment such as shell and tube heat exchanger.The module model calculation method divides the overall model into several independent unit modules,processes them respectively,and then synthesizes the data of each unit module to obtain the overall result.Taking a baffle shell and tube heat exchanger as an example,the heat exchanger is divided into inlet module,periodic boundary module and outlet module.The divided position of the unit module is the key factor affecting the calculation accuracy.Therefore,the flow field and temperature field of the overall model of the heat exchanger is calculated firstly,according to the characteristics that the pressure drop,velocity and dimensionless temperature reach a stable value after the fluid enters the fully developed state,the section position of the inlet module is judged to be at the third baffle,the section of the periodic boundary module is in the fluid section close to the baffle,and the section of the outlet module is at the last baffle.The module model of the heat exchanger is established according to the above section position.The heat flow field under a series of turbulent Reynolds numbers is calculated by the module model,and its accuracy is verified by the overall model and the experimental data.The results show that when Re is less than 10 000,the calculation results of the module model are similar to the overall model,and the module simulation method can be used instead of the overall model method to calculate the heat flow field of the heat exchanger.Compared with the experimental data,the shell side pressure drop of the module method is smaller,and the heat transfer coefficient is larger.Compared to the overall heat exchanger model,the calculation duration of the modular method is about 36%of the former,and the calculation efficiency is improved by at least 5 times,greatly saving computer hardware configuration and shortening the calculation duration.
CFD simulationfull-developed flow fieldsegmental baffle heat exchangermodule methodflow field analysis
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