Study On Heating Processing Of Canned Packaged Food By Using CFD

Canned packaging is one of the most common storage methods for fruits and vegetables.It has natural advantages in nutrition preservation and freshness preservation.At the same time,it is one of the important export industries in China.In canned food,besides pure liquid canned milk and fruit juice,solid-liquid two-phase mixed canned food accounts for a large proportion in canned food.Based on ANSYS FLUENT finite element analysis software and thermodynamic performance analyzer,different types of solid-liquid two-phase cans were used as simulation and simulation objects.The distribution of solid contents,the method of establishing canned models and the effect of canned packaging shape on the thermal sterilization process of canned food were investigated.Based on the distribution pattern of solid contents in metal canned yellow peach cans,the random distribution model of irregular position of solid contents and the uniform distribution model of solid contents were established,and the effect of solid contents on the results of finite element simulation of solid-liquid two-phase cans was explored.Compared with the experimental results,the simulation results of the random distribution model are more credible,and the warming trend is consistent with the experimental results,which verifies the accuracy of the results.Taking two different types of canned solid content as the research object,two random model building methods were proposed through the script files in VBA macro and SpaceClaim.Coconut and pear cans were selected as reference cans,and random distribution models of coconut and pear cans were established by the above two modeling methods.The physical properties of the two kinds of cans,such as moving viscosity,specific heat capacity and heat transfer coefficient,were measured by thermal analyzer and moving viscosimeter.As parameters of the cans in simulation,the finite element model of the sterilization process of cans was established based on heat transfer theory and flow field theory.The results show that the simulation results are in good agreement with the experimental results,which verifies the reliability of the random distribution model building method.Taking canned yellow peach as the research object,the heating process of solid-liquid two-phase can sterilization was explored,and the influence degree of packaging size change on improving sterilization efficiency and energy saving and consumption reduction was studied.Using ANSYS FLUENT software to simulate and analyze the flow field and temperature field,the reliability of simulation was verified by experiments.On this basis,the bottle shape of canned yellow peach was improved to improve the sterilization efficiency.The simulation results show that under the same conditions,the diameter of the bottom of the can is negatively correlated with the maximum flow rate in the tank.Under the same height and volume conditions,reducing the diameter of the bottom can improve the sterilization efficiency.