Research On Enhanced Heat Transfer Of Inclined Corrugated Plate Heat Exchanger

The plate heat exchanger has various plate structures.Finding a "high-efficiency and low-resistance" plate structure has always been the focus of attention of researchers.Taking the oblique corrugated heat exchanger provided by Lanke Hightech Equipment Company as the research object,through a combination of numerical simulation and experimental testing,the correlation between flow and heat transfer is obtained.Visualized analysis of flow field based on field synergy theory,and qualitatively described the change of synergy between different plate structures.With the help of numerical simulation software ANSYS Workbench,the flow and heat transfer process of the plate heat exchanger and the parametric analysis of the initial structure are studied,and the best matching relationship between heat exchange and pressure drop is sought,which provides a reference for the optimal design of the plate heat exchanger.The specific research content and conclusions are as follows:(1)Build a test platform for the water-to-water heat transfer and flow of the oblique corrugated plate heat exchanger,test the oblique corrugated plate heat exchanger,process the experimental data based on the principle of optimization,and use the least squares method to fit the test data The correlation equation of flow heat transfer provides a basis for verifying the reliability of numerical simulation.(2)The grid quality in the channel of the small gap plate heat exchanger is poor,which causes the floating point overflow to be unable to calculate.The Poly-Hexcore meshing method effectively solves the problem of poor mesh quality,while also effectively reducing the overall number of meshes,thereby reducing the solution time;using CFD numerical simulation methods to study and analyze various turbulence models under the same conditions According to the calculation results,the RNG model suitable for the structure of the plate heat exchanger is finally selected,and the minimum error is only 1.65%;the reliability of the Fluent numerical simulation results is verified by the HTRI calculation value and the test value,and the HTRI calculation value and the CFD software simulation value and the experimental value are found The errors between them are only 1.65% and 1.26% respectively,which verifies the reliability of the numerical simulation and lays the foundation for the follow-up work.(3)Based on the theory of field synergy,analyze the coordination of the velocity field,heat flow field and pressure field under different plate structures.The angle between the speed vector and the temperature gradient vector can be as small as possible to improve the heat transfer enhancement effect.While improving the field synergy effect,it is also necessary to consider reducing the resistance consumption as much as possible,so that the synergy angle between the pressure vector and the speed vector is reduced,which is a plate type.The enhanced heat transfer of the heat exchanger provides a theoretical basis.(4)In order to realize the "high efficiency and low resistance" of the plate heat exchanger,the RS plate heat exchanger is optimized for enhanced heat transfer based on the response surface analysis method.First,parameterize the three-dimensional model and speed,and reasonably constrain the parameterized data;secondly,optimize the parameterized model and flow velocity in the flow field to determine the optimized objective function,and select the optimization method and method suitable for the model.DOE test method.Finally,based on the response surface method to conduct enhanced heat transfer analysis,it is concluded that the Nusselt number is only reduced by 6.99%,and the friction coefficient can be reduced by 31.92%.The design concept of high efficiency and low resistance is also reached.This optimization method is the future heat exchanger The optimized design provides a theoretical reference.