Date of Award


Document Type


Degree Name

Master of Science (MS)


Chemical Engineering


The objective of this experiment was to determine the thermal con ductivity and thermal diffusivity of lignite from five mines in North Dakota and Montana with full bed moisture.

The values of the thermal conductivity and thermal diffusivity found in the present work do not show a significant difference between samples. The thermal conductivity ranges from 0. 152 to 0. 170 Btu hr-1 ft-1 deg F-1. The thermal diffusivity was from 0.0051 to 0.0058 sq ft hr-1. No significant difference was found due to the cut of the samples with the long axis parallel or perpendicular to the bedding plane.

Specific heat and density determinations for each sample of lignite were made. These values ranged from 0.33 to 0.4 3. Btu lb-1 deg F-1 and from 74.3 to 82.9 lb ft-3 respectively.