The effective thermal conductivity for a pointcontact porous medium: an experimental study
The effective thermal conductivity for a pointcontact porous medium: an experimental study
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点接触多孔介质的有效导热系数：实验研究
DOI：
10.1016/0017-9310(89)90138-5
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发表时间：
1989
影响因子：
5.2
通讯作者：
S. Whitaker
中科院分区：
文献类型：
--
作者：
D. Shonnard;S. Whitaker
为了验证Batchelor和奥布莱恩关于点接触多孔介质的内膨胀理论，构造了空间周期性多孔介质的单胞，并利用该单胞测量了多孔介质的有效导热系数。晶胞由大的金属半球组成，这些半球通过系统电导率的突然变化而形成点接触。实验结果验证了Batchelor和奥布莱恩提出的K σ/kβ的函数关系。此外，我们的实验数据和Batchelor和奥布莱恩的理论与斯威夫特的实验结果具有数百微米的颗粒直径的数量级的金属粉末是在很好的协议。
In order to test the inner expansion theory of Batchelor and O'Brien for a point-contact porous medium, a unit cell of a spatially periodic porous medium is constructed and used to measure the effective thermal conductivity. The unit cell is made of large, metal hemispheres which are brought into pointcontact as determined by an abrupt change in the electrical conductivity of the system. Experimental data are obtained for ratios of the thermal conductivitykσ/kβranging from 102to 104and the results verify the functional dependence ofKeffonkσ/kβpredicted by Batchelor and O'Brien. In addition, our experimental data and the theory of Batchelor and O'Brien are in good agreement with the experimental results of Swift for metal powders having particle diameters of the order of hundreds of micrometers.