摘要
多孔介质内部结构中发生的质量、动量、能量的传递是众多自然现象和生产、生活领域中发生的基本过程。有关多孔介质中的传热问题涉及许多科学领域,早就引起人们的广泛关注,研究人员也对其进行了长期的研究。等效导热系数方法即将多孔介质视为一种连续介质,将实际多孔介质中固体骨架与各种流体的传热模式(导热、对流、辐射)折合成一个综合的传热问题。此方法已成为研究多孔介质内部传热问题最常用的方法。最近一二十年,泡沫型多孔介质(如泡沫金属、泡沫碳等)的出现引起人们广泛的关注。本文针对此种新型多孔介质等效导热系数的研究做了综述,介绍了3种常用的研究方法,分别是实验测试法、理论推导法及数值模拟法,探讨了各种研究方法存在的问题。实验测试法准确性高,但每种传热模式对等效导热系数的影响很难确定,且成本高;理论推导法虽然物理意义明确、适用性广,但与实测结果有较大的偏差,且有些方法还需与实验相结合;数值模拟法建模较复杂,但模拟结果与实验数据较接近。
Mass, momentum and energy transfer in the internal structure of porous media are basic processes of life, natural phenomena and production. Questions about heat transfer in porous media involve many fields of science, which have aroused researcher＇s wide attention and they also have done a lot of works on this. Effective thermal conductivity method is to view porous media as a continuous medium. The actual solid skeleton and all kinds of heat transfer model in porous media （heat conduction, convection and radiation） can be converted into an integrated heat conduction problem. It has already become the most commonly used approach in the porous medium heat transfer issue. Recent years, the bubble type porous medium （such as the metal foam, ceramic foam or graphite foam） has attracted widespread attention. Researches on the effective thermal conductivity （ETC） of bubble type porous media are reviewed in this article. Three kinds of research methods are introduced, including experimental testing, theoretical derivation and numerical simulation. Finally, the problems existing in the research of effective thermal conductivity are discussed. Experimental testing method does have high accuracy but it is difficult to determine the contribution of each heat transfer model to the ETC and the cost of the testing is high. Although theoretical derivation method has clear physical meaning and wide applicability, the results have larger deviation and some resulting correlations include coefficient based on experience or experimental data. The results of the numerical simulation are close -to the experimental data but the complexity lies in the model construction.
出处
《储能科学与技术》
CAS
2013年第6期577-585,共9页
Energy Storage Science and Technology
关键词
等效导热系数
泡沫型多孔介质
综述
effective thermal conductivity
bubble type porous medium~ review
