EFFECTIVE THERMAL CONDUCTIVITY FOR GRAN-ULAR BEDS OF VARIOUS BINARY MIXTURES

[摘要] References(10)Cited-By(24)The effective thermal conductivity was investigated for granular beds of various binary mixtures. Samples used were two or three sizes of glass beads, resin particles and copper spheres respectively. A unit cell model was developed after due consideration of particle diameter ratio and it was assumed that the coordination number was a function of diameter ratio and volume fraction of components. Predicted values coincided with experimental ones, in which the ratio of diameters was 1-2.8 and the ratio of solid conductivities was 1-5.8, within 6% deviation.