Study On The Structure Optimization And Heat Transfer Performance Influence Of Plate Heat Exchanger With Hemispherical Structure

As an important equipment for heat transfer,heat exchangers are widely used in processing,power generation,HVAC,transportation and manufacturing.Among the many forms of heat exchangers,plate heat exchangers are favored in various fields due to their compactness,high efficiency,design flexibility and low cost.In this paper,the heat transfer process of V-shaped plate heat exchanger is numerically simulated by finite element software,the influence of turbulent structure on the heat transfer performance of heat exchanger is studied,and experiments are designed and compared and analyzed by numerical simulation results.The main research content of this paper includes the following:ANSYS Fluent software was used to explore the heat transfer performance of various types of plates with hemispherical structures of different sizes.The numerical simulation results show that the addition of hemispherical pit structure can make the flow of the high-speed flow area around the heat exchanger contact more uniform,and significantly increase the flow velocity in the wide flow channel area.With the increase of the size of the structure,the temperature field,velocity field and pressure field in the flow channel increase more and more than the original plate,and the heat transfer effect of type IV.plate(d=3mm)is the best considering the improvement of the heat transfer effect of the turbulent structure and the increase of friction factorIn the research process,in order to enhance the heat transfer effect at the same time,the pressure drop due to friction loss is minimized.Taking the ratio of the radii of the adjacent two hemispherical pits as variables,a series of values were designed as the gradient ratio of the structural dimensions,and several sets of hemispherical structures that gradually shrink from the exit of the passage to the inlet were designed,and A NSYS F was used Luent conducted numerical simulation studies and showed that the heat transfer effect is best when the gradient ratio is 0.6.On the basis of the original I.plate plate,the IV.plate was prepared by stamping process,and the water-water heat exchange experimental platform of the plate heat exchanger was built,and the heat exchange performance of the type I and IV plates was tested to obtain experimental test results and numerical simulations for comparative analysis,and the average value was taken after many experiments.The inlet and outlet temperature changes and numerical simulation results of the heat exchanger composed of various types of plates are less than 10%,and the numerical simulation results can be considered reliable.