Abstract
The effective thermal conductivities λe of several types of sands were measured by a transient hot-wire technique. λe of dispersed material is found to depend strongly on its porosity but weakly on grain size. The effect of the thermal conductivity of the moistening fluid λf is also strong, with λe being a power function of λf, if the latter one is small. The temperature effect obtained between 20 °C and 70 °C seems to be due to temperature dependent conductivities of the moistening fluids. A pressure effect is only obtained in case of gases within a certain pressure range which depends on particle size. Two theoretical models of heat transfer in porous media (by Kunii and Smith and by Zehner and Schlünder) are used to predict measured effective thermal conductivities, the agreement was found to be quite well.
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© 1991 Springer Science+Business Media Dordrecht
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Hahne, E., Song, Y.W., Gross, U. (1991). Measurements of Thermal Conductivity in Porous Media. In: Kakaç, S., Kilkiş, B., Kulacki, F.A., Arinç, F. (eds) Convective Heat and Mass Transfer in Porous Media. NATO ASI Series, vol 196. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3220-6_29
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DOI: https://doi.org/10.1007/978-94-011-3220-6_29
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