Numerical Simulation And Experimental Research Of Heat Transfer Process Of Fin Tube

Heat exchanger is indispensable in process of industrial heat transfer,and is widely used by each department on industry.With the development of technology and industry,heat exchangers are required of compactness,portability,high efficiency and miniaturization.The fin tube heat exchanger and plate heat exchanger are paid more concentration by people.Fin tubes are the key part of fin tube heat exchangers,which quality are directly related to working characteristic of heat exchanger.In this thesis,in order to optimize design and manufacture,the heat exchanging process and heat transfer effect of fin tube,which is manufactured by means of cutting-extrusing composite technics,are studied with 3D-finite element analysis method.The simplified 3-D solid model is built with an 3-D solid modeling software(CATIA).The hexahedral element mesh is generated with ANSYS ICEM CFD.Using ANSYS CFX as simulation tool,setting interfaces between fluid and fin tube as fluid-solid coupled heat transfer boundary in condition of invariable heat flux,model establishment and simulation computation of fin tube heat exchanger are completed.According to simulation results,analyzing the effect of fin tube structure parameters and fluid around fin tube on heat transfer effect,the influence law that pitch,thickness & height of fin and different types of fluid around fin tube affect heat exchange effect is obtained.An experimental platform of researching heat exchange performance of fin tubes is built. Average heat transfer coefficient is obtained by means of numerical simulation of forced convection heat transfer around fin tube.The experiment results indicate that the effect of fin height on average heat transfer coefficient comes first,the fin spacing second,the fin thickness last.The average heat transfer coefficient increases at the previous period and decrease at the later period with the increase of the thickness of fins,while it increases with the decrease of fin spacing and the increase of fin height.With optimization analysis of heat transfer,optimum structure parameters of fin tube are obtained,and the experiment results confirms the validity of numerical simulation.