Metallized Microwave Package Research To Improve The Effect Of Microwave Heating Of Food

Recently the food non-uniform heating of microwave oven owns widespread concern.Non-uniformity of microwave heating of food will influence the taste of food. Exceptimprove the microwave heating effect through design structure of the microwave oven，improve the effect by metallized microwave package become another important method. Thispaper research the methods using the finite element method to simulate microwave foodpackaging，and validate the simulate results with experimental results. Analysis effect of foodand dielectric properties，shape，size of the microwave heating effect，Design metallmicrowave package containers in which food is heated more uniform.(1) Reviews the status of research，trends and existing problems of metal packagingcontainers design and simulation of microwave heating of food. The methods and processesof analyze microwave heating of food by finite element analysis has been studied. Researchthe simulation method and process of microwave heating packaged foods by finite elementsoftware，including the establish the model，grid division and parameter settings，etc.Establish a time-dependent electromagnetic and heat transfer coupling model to simulate theprocess of microwave heating of food by software COMSOL， and compared withexperimental results.(2) Combines simulation method，analysis of the effect of food dielectric properties,shape and size of the microwave heating effect. Found when other factors are approximatelythe same，food type and shape have little effect on the microwave heating effect. Butexcessive heat may appear in the center of round food circle. The size of the food has agreater effect on the microwave heating，with the food diameter increasing temperaturedistribution inside and outside the sample after microwave heating gradually showed a highertemperature trend around outside of the food. Only when the size of the food is very small itshowed a trend of faster central heating. Food packaging container having a certain size aregenerally not too small，and therefore，the phenomenon of rapid heating of outside of foodusually occurs.(3) Through simulation，the thickness，shape，size and spacing of components of theinteraction of microwave energy components are studied deeply. Investigate how these factorsaffect the specific effect of microwave heating，and get some disciplines to provide somebasis for the later detailed design of metal packaging containers. Studies show that when theinduced current is not considered，and the size and arrangement of the metal sheets are thesame，the shape of the metal sheets have very small influence of microwave energytransmission. When other factors are the same，the spacing of the metal sheets have littleinfluence of the microwave heating effect. However，the size of the metal sheets have greaterinfluence of the microwave heating effect，When the size of metal sheets equal to/2or amultiple of/2， the effect on microwave heating maximized and can increase the ambienttemperature around the metals preferably. (4) Optimal designed the typical metallized microwave packaging containers.Experimental evaluate the performance of the metal packaging containers. Rectangular metalmicrowave packaging containers and circular metal microwave packaging containers weredesigned，experiments validation have been done for different sizes potatoes and rice. Theresult show that，with the same metal packaging container，microwave heating can achieveuniform heating effect with different foods，with the same metal packaging container，microwave heating can achieve uniform heating effect with different sizes of food. Thus，theapplicability of the metal microwave packaging containers are very broad，to meet thedifferent foods and different sizes of food.