THERMAL CONDUCTIVITY OF HETEROGENEOUS 2-COMPONENT SYSTEMS
THERMAL CONDUCTIVITY OF HETEROGENEOUS 2-COMPONENT SYSTEMS
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DOI：
10.1021/i160003a005
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发表时间：
1962-01-01
期刊：
影响因子：
--
通讯作者：
CROSSER, OK
中科院分区：
文献类型：
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作者：
HAMILTON, RL;CROSSER, OK
研究了颗粒形状、组成和纯组分导热系数对由连续相和非连续相组成的非均相双组分混合物导热系数的影响。在选定的组成下，测量了轻木和铝颗粒作为橡胶中的几种形状的混合物的热导率。用经验形状因子n依赖于相的热导率和所含颗粒形状的公式，可以精确地计算出差别很大的非均相双组分体系的热导率。粒子形状对n的影响可以用粒子的球形度来解释。大量的研究都是关于非均质系统中的热传递。这些系统采取多种形式：填充床和复合绝缘体（77）、泡沫金属或玻璃（6，73）、乳液（70）、固体在气体（72）或液体（77）中的混合物、凝胶（9）、合金（7）、陶瓷（75）以及许多其它材料。这些研究通常试图确定这样一个系统的导热系数或测量对流或辐射对总传热的额外贡献。在任何一种情况下，重要的是要准确地确定发生的传导热传递的量。任何系统的导热率描述的是仅通过传导过程传递的热量。本研究的目的是发展计算或关联两组分非均质混合物的导热系数的程序，该导热系数是纯物质的导热系数、混合物的组成以及纯物质在混合物中分布的方式的函数。
The influence of included particle shape, composition, and pure component conductivity upon the thermal conductivity of heterogeneous two-component mixturesconsisting of a continuous and a discontinuous phase was studied. Thermal conductivities were measured for mixtures of balsa wood and aluminum particles as several shapes in rubber at selected compositions. Thermal conductivities for widely different heterogene-ous two-component systems can be calculated accurately using an equation in which the empirical shape factor n depends on thermal conductivities of the phases and the included particle shape. The influence of particle shape on n can be accounted for using the sphericity of the particle.* large amount of researgh has been concerned with the transfer of heat through heterogeneoussystems. These systems takemany forms: packed beds andcomposite insulations (77), foamed metals or glasses (6, 73), emulsions (70), mixtures of solids in gases (72) or liquids (77), gels (9), alloys (7), ceramics (75), and many others. These studies usually seek to determine the thermal conductivity of such a system or to measure the additionalcontribution to the total heat transfer offered by convection or radiation. In either case, it is important to establish accurately the amount of conduction heat transfer which occurs. The thermal con-ductivity of any system describes the heat transferred only by the conduction process. It was the purpose of thisresearch to develop procedures for calculating or correlating the thermal conductivity of two-componentheterogeneous mixtures as a function of the conductivity of the pure materials, the com-position of the mixture, and the manner in which the pure materials were distributed throughout the mixture.