Numerical Study On Heat Transfer Performance Of Plate Heat Exchanger Based On Field Synergy

As a high-efficiency heat exchanger with a wide range of industrial applications,high heat transfer efficiency,and low economic cost,plate heat exchangers,it has been continuously optimized and improved under the current high development trend.The research in this paper aims to build a mathematical model of the plate flow channel by CFD numerical simulation method,change the structure of the three-digit mathematical model and use the model structure to optimize.Combined with the field synergy principle,the heat transfer characteristics inside the plate heat exchanger and how the structural changes affect the heat transfer performance are investigated to obtain the heat transfer optimization and the optimal structural parameters under the current mainstream plate type.In this paper,Solidworks software is used for mathematical modeling according to the structure of the current mainstream heat exchanger Alfa Laval M10-MFM.After the grid is properly divided,the model is imported into fluent for simulation.Enter to obtain the heat transfer field cloud map and the coordinate angle cloud map.Then use the control variable method to change one of the ripple inclination angle β,the ripple depth h and the ripple distance λ,keeping the other two parameters unchanged,and obtain the temperature field,pressure field,velocity field and coordinate angle cloud map under different parameters.In the post-processing of the data,the Nu number under different parameters and the pressure difference between the inlet and the outlet are calculated to explore the relationship between heat transfer and resistance and the structure.In the process of simulation,it can be found that when the number of grid nodes is greater than 6 million,the change in inlet and outlet pressure differences tends to be stable,and the grid independence is verified.When the inlet flow rate is changed,the change trend of the outlet temperature and the inlet and outlet temperature difference are consistent with the experimental data,indicating that the simulation in this paper is reliable.The most important factor that affects the heat transfer effect of the plate heat exchanger is the contact mode of the upper and lower plates in the plate flow channel.The fluid can form more turbulence at the contact point is the basis of enhancing heat transfer.When the ripple inclination angle,β is 50°,the flow resistance is the smallest and the heat transfer is the best.The increase of the corrugation depth h and the corrugation distance λ both lead to an increase of the flow resistance.When h=3～4mm,λ=13～14mm,the temperature field and flow field have the best synergy.Taking all conditions into consideration,when β=50°,h=3～4mm,λ=13～14mm,and λ/h=3～4,the plate heat exchanger composed of Alfa Laval M10-MFM plates transfers Thermal performance and internal resistance will be best optimized.