Effective Thermal Diffusivity of Powdered Coal
The line heat-source technique was used for the direct determination of the effective thermal diffusivity for two samples of powdered coal at two different particle size distributions. Measurements were made on Western Kentucky No. 9 and No. 11 coals at three different densities corresponding to light, moderate and dense packing. Particle size distributions were established by using samples that would pass through 10 and 200 mesh Tyler screens. The mean value of the thermal diffusivity for these was 1.29 x 10-7 m2/s. Values for the dense packing were about 10% higher than the average and about 10% lower for the loose packing. Coal type was hot found to be a significant parameter but there was a slight effect of particle size with the finer particles not showing as strong a dependence on packing as did the coarser particles.
KeywordsThermal Diffusivity Dense Packing Effective Thermal Conductivity Coal Sample Contact Conductance
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