【摘要】 构建了玉米速冻机内堆积床多孔介质传热分析模型，提出了新的利用效率，发现了的波函数和场函数特征。基于此模型，根据降温曲线，预测了多孔介质内玉米降温过程中表面温度、温度梯度、对流传热系数、耗散的分布规律，发现了导热、对流、辐射耦合传热的介尺度特征。研究发现：传热核心的体积尺度、温度梯度增长率决定表面热流密度、对流传热系数大小，内部导热温度降度的波动特性，决定表面热流密度、对流传热系数变化趋势；沿程传热系数可精准预测多孔介质内的温度变化趋势；多孔介质有显著的强化传热作用，面向大空间辐射和多孔介质区域的对流传热系数比例大致为0.6，辐射与对流有一定场协同特征。更多还原

【Abstract】 Entransy analytical model of heat transfer process in stacked porous medium is built,and a new utilization efficiency of Entransy is proposed, meanwhile wave function and field-characteristics of Entransy are found. Based on the model, coupling the cooling curve,-temperature of cooling products in porous medium, internal temperature gradient,-heat transfer coefficient along quick freezer, entransy dissipation rate during cooling process are predicted for the first time. Mesoscale characteristics of coupled heat transfer for-, convection and radiation in heat transfer process in porous medium have been found.-show that, volume scale of internal heat transfer core and temperature gradient control heat flux and convective heat transfer coefficient on surface, and wavy characteristics of internal-difference decreasing rate affect tendency of heat flux convective heat transfer coefficient.Temperature change trend can be predicted accurately based on along heat transfer coefficient.Porous medium can enhance heat transfer, and scaling factor of heat transfer coefficient without and within porous medium is about 0.6, meanwhile radiation and convection have field synergy characteristics.更多还原