Effective Thermal Diffusivity of Powdered Coal

  • Clifford J. Cremers


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.


Thermal Diffusivity Dense Packing Effective Thermal Conductivity Coal Sample Contact Conductance 
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  1. 1.
    Tye, R.P., Desjarlais, A.O. and Singer, J.M., “Thermophysical Properties of Pittsburgh Seam Coal,” High Temp.-High Pres. 13, 57–68 (1981).Google Scholar
  2. 2.
    Vargha-Butler, E.I., Soulard, M.R., Hamza, H.A. and Neumann, A.W., “Determination of Specific Heats of Coal Powders by Differential Scanning Calorimetry,” Fuel 61, 437–442 (1982).CrossRefGoogle Scholar
  3. 3.
    Miura, T., Tajamia, H., Miura, K. and Ohtani, S., “Measurement of Effective Thermal Conductivity of Packed Coal during Carbonization,” Heat Trans. Jap. Res. 10, 81–93 (1982).Google Scholar
  4. 4.
    Cremers, C.J., “Density, Pressure and Temperature Effects on Heat Transfer in Lunar Material,” AIAA J. 9, 2180–2183 (1971).CrossRefGoogle Scholar
  5. 5.
    Jaeger, J.C., “The Use of Complete Temperature-Time Curves for Determination of Thermal Conductivity with Particular Reference to Rocks,” Aust. J. Phys. 12, 203–217 (1959).Google Scholar
  6. 6.
    Carslaw, H.S. and Jaeger, J.C., “Conduction of Heat in Solids,” ( 2nd Ed. ), Clarendon Press, Oxford (1959).Google Scholar
  7. 7.
    Carslaw, H.S., “Handbook of Mathematical Functions,” M. Abramowitz and I.A. Stegun editors, U.S. Department of Commerce, Washington, DC (1964).Google Scholar
  8. 8.
    Blackwell, J.H., “Radial-Axial Heat Flow in Regions Bounded Internally by Circular Cylinders,” Can. J. Phys. 31, 472–483 (1953).Google Scholar
  9. 9.
    Schack, A., “Industrial Heat Transfer,” John Wiley and Sons, New York (1965).Google Scholar

Copyright information

© Purdue Research Foundation 1985

Authors and Affiliations

  • Clifford J. Cremers
    • 1
  1. 1.Department of Mechanical EngineeringUniversity of KentuckyLexingtonUSA

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