Heat and Mass Transport Properties of Heterogeneous Materials
Relating to the drying mechanism of the wet porous materials, correlating (or predicting) methods for effective thermal conductivity of the wet porous solid and the apparent mass transfer coefficient of the adsorbed molecule in the adsorptive fine-porous
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Department of Chemical Engineering, Kyoto University Kyoto 606, JAPAN
ABSTRACT
2. EFFECTIVE THERMAL CONDUCTIVITY OF WET POROUS MATERIAL
Relating to the drying mechanism of the wet porous materials, correlating (or predicting) -methods for effective thermal conductivity of the wet porous solid and the apparent mass transfer coefficient of the adsorbed molecule in the adsorptive fine-porous solid are described.
Effective thermal conductivities of wet porous material, such as packed bed of particles, bricks, thermal-insulation materials or sintered metals, are often used for various engineering calculations as well as for studies of solid drying. In dried-up or fully saturated state, the porous material consists of two phases, solid and fluid (gas or liquid)phase. The wet porous material below saturation consists of three phases, solid, gas and liquid. In the following, correlation or prediction procedures of effective thermal conductivites of wet porous materials in which the thermal conductivity of the solid phase, X8 , is greater than the one of the liquid phase, Xz are mentioned first. Then those for case of X8 RT as the basis for the present model, where E , E and RT are the potential barrier among ggso~tion sites, the differential heat of adsorption and the thermal motion energy of molecules respectively. In the case that E
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