速冻机内多孔介质传热[火积]分析模型构建与耦合传热过程分析  

Analytical Model in Porous Medium for Coupling Mechanism of Heat Transfer Process Analysis in Quick Freezer

作　　者：杨勇[1] 陈宝军 李广富 张帅 刘金田 李文斐 孔世宁 张昭[3] 刘红[1] 沈胜强[1] YANG Yong;CHEN Baojun;LI Guangfu;ZHANG Shuai;LIU Jintian;LI Wenfei;KONG Shining;ZHANG Zhao;LIU Hong;SHEN Shengqiang(Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education,School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China;Dalian Bingshan Lingshe Quick Frozen Equipment Co.Ltd.,Dalian Bingshan Group,Dalian 116699,China;School of Mechanics and Aerospace Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院海洋能源利用与节能教育部重点实验室,大连116024 [2]大连冰山集团大连冰山菱设速冻设备有限公司,大连116699 [3]大连理工大学力学与航空航天学院,大连116024

出　　处：《工程热物理学报》2025年第1期27-34,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金重点项目(No.51936002);大连市科技创新基金项目(No.2020JJ26SN063)。

摘　　要：构建了玉米速冻机内堆积床多孔介质传热[火积]分析模型,提出了新的[火积]利用效率,发现了[火积]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、[火积]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。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 function characteristics of Entransy are found.Based on the model,coupling the cooling curve,surface temperature of cooling products in porous medium,internal temperature gradient,convective 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 conduction,convection and radiation in heat transfer process in porous medium have been found.Results 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 temperature 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.

关 键 词：[火积] [火积]利用效率 温度降度 场协同 多孔介质 

分 类 号：TS255.3[轻工技术与工程—农产品加工及贮藏工程]