This paper describes using the Runge-Kutta method to carry on numerical calculation about mixed convection heat transfer, and analyses the result combining with the process of food freezing.

• 用龙格一库塔法进行了混合对流换热的数值求解，结合食品冷冻分析了数值计算结果，探讨了食品冷冻中冷风的合理流向。