稠密颗粒介质热辐射传输特性的边界效应  

Boundary Effect on the Thermal Radiative Transport Properties in Dense Particle Media

作　　者：刘宝坤 付金余 赵军明[1] 刘林华 LIU Baokun;FUJinyu;ZHAO Junming;LIU Linhua(School of Energy Science and Engineering,Harbin Institute of Technology,Harbin 150001,People's Republic of China;School of Energy and Power Engineering,Shan Dong University,Qingdao 266237,People's Republic of China)

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001 [2]山东大学(青岛)能源与动力工程学院,山东青岛266237

出　　处：《工程热物理学报》2023年第2期457-462,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金(No.51976045)。

摘　　要：稠密颗粒介质在自然界和工业生产中广泛存在。在高温条件下,辐射对传热过程有十分重要的影响,并且在实际工程应用中,边界的作用不可忽略。本文采用辐射传递函数(RDF)作为表征体系内辐射换热的特性参数,它是辐射传递因子(RD)从离散尺度到连续尺度的扩展,不仅包含几何信息还包含辐射能量信息。因此它可以完全表征体系中的辐射换热,从而有助于直观地分析边界对颗粒热辐射传输特性(以RDF分布进行表征)的影响。分析了在靠近反射性边界时颗粒填充率和颗粒表面发射率对颗粒热辐射传输的影响,结果表明,边界对于由RDF表征的系统内颗粒热辐射传输有重要影响,颗粒填充率和颗粒表面发射率对该影响具有调节作用。研究结果有助于深入理解稠密颗粒介质中的热辐射传输机制。Dense particle media are widely used in natural and industrial processes. The influence of radiation on the whole heat transfer process is very important at high temperatures and the role of the boundary cannot be ignored in actual engineering applications. In this work, the radiation distribution function(RDF) is used as a parameter to characterize the radiative heat transfer in systems. It is an extension of the radiation distribution factor(RD) on the discrete scale to the continuum scale, which contains not only geometrical information but also radiative information.Thus, it fully represents the radiative heat transfer in a system and thus helps to visually analyze the influence of the boundary on the radiative transport properties of the particles(represented by the RDF distribution). This work investigates the effect of the particle filling ratio and the particle surface emissivity on the particle thermal radiation transport when close to a reflective boundary in a particle system. The results show that the boundary has an important influence on thermal radiation transport which is characterized by RDF. The particle filling ratio and surface emissivity can modify this effect. This paper helps to gain an in-depth understanding of thermal radiation transport in dense particle media.

关 键 词：辐射换热 颗粒介质 边界效应 辐射传递函数 

分 类 号：TK124[动力工程及工程热物理—工程热物理]