The Study On Heat Transfer Process And Heat Absorption Rate Influencing Factors Of Self-heating Food

With the continuous development of society, people’s living standards are higher and higher. Meanwhile, the self-heating food can be more favored by many consumers in different industries due to its safety, convenience, good taste, nutrients and other characteristics. Self-heating food mainly consists of the heated food, the heat source, the activator and packaging materials. And its heat transfer process is highly complex, which does not only include the heat conduction, convection and phase change heat transfer, but also include the fluid-solid coupled heat transfer problem at the same time. In order to improve the heat absorption rate of self-heating food, it is necessary to consider multiple factors which affect the heat absorption rate, such as the shape and size of the packaging material, heating source layout, the quality of heating source to match the environmental temperature, etc. However, it is unrealistic to produce and test for each research programs,as a result of its high cost, large material consumption, long testing time. Among these methods of study, the Numerical simulation has the advatange of lower cost, shorter design cycle, etc. Therefore, the issue studies the heat transfer of the self-heating food by using the method of combining Numerical simulation with experiment.The issue, taking self-heating rice for instance, is aimed at studying profoundly on the heat transfer mechanism of the self-heating food with heat transfer theory in use.Considering the self-heating food’s heat transfer process is a high complex three-dimensional problem, we regard establishing the three-dimensional model which is reasonable and close to the actual structure as the foundation and the key. First of all, the three-dimensional model of the self-heating rice is established almost the same as the actual structure by combining the method of Numerical simulation with the experiment,including establishment of heat source, heated rice, water vapor and a variety of packaging materials. On the basis of it, the study researches the affect of heat absorption rate from three aspects, namely, different types of corrugated paper, different heating plate layout,the matching relationship between heating plate quality and environmental temperature.Then, by using the method of simulation combined with experiment, we have obstained which corrugated type has better heat insulation effect. Meanwhile, it is need to use FLUENT software to calculate four different layout of heating plate, based on the comparative analysis of the different measuring point in temperature curves of different heating rice, taking the economic costs and the difficulty of processing and other factorsinto account, we have obtained the heating plate layout with the optimal heat absorption rate. Finally, according to the experiment and simulation results, we researched the matching relationship between heating effect of heated rice and the heating plate’s quality under different temperature. The whole research work provides more comprehensive data and theoretical guidance for the self-heating food in subsequent production processing and optimization design.