Abstract
Hereunder is presented the report of investigation made both theoretically and experimentally of the influence of the contact areas of particles on the effective thermal conductivity of the axially stressed packed bed.
The contact areas of the particles were first related to the axial load, and to the axial load, then the thermal conductivity of the axially stressed packed bed has been related. The relation between the thermal conductivity of the axially stressed packed bed and the axial load has been shown as proportional.
It has been experimentally examined by compressing the lead, steel and glass spheres in a cylindrical die and giving heat flow axially through this packed beds. The proportional relation between the thermal conductivity of the axially stressed packed bed and the axial load has been also observed. But there has been observed some difference between the theoretical and the experimental proportional constant.
It is suggested that this apparent difference is due to the difference between the real contact areas and the theoretical contact areas of the stressed particles. Then the ratio of these two areas has been defined as the effective contact ratio of the stressed particles. So far as our experiments are concerned, the larger the particle diameter, the further reduced is this ratio of areas.
