Thermal Properties of Moist Granular Materials at Temperatures Below 0°C

  • I. A. van Haneghem
  • H. P. A. Boshoven


Experimental research on the thermal properties of moist granular materials at temperatures below 0°C is reported. The measurements were carried out by the non-steady-state line-source method (probe method). When some specific conditions are satisfied and when the accuracy of the complete measuring system is high, both the thermal conductivity coefficient, λ, and the volumetric heat capacity, ρc, can be obtained in a single measurement.

Preliminary measurements, performed with low concentration agar gels, showed that the λ values are reproducible within 1% and the ρc values within 2.5%. The accuracy in λ is 1.5%. The measurements were performed with relatively simple granular materials. Until now, measurements were usually carried out with moist glass beads. The most interesting results are presented.


Thermal Property Glass Bead Granular Material Freezing Point Test Measurement 


a = λ/ρc

thermal diffusivity (m2 s−1)

\({{\text{a}}_{{{\text{T}}_{o}}}}\), ao

thermocouple constants (V K−1)


intercept (K)

\({{\text{b}}_{{{\text{T}}_{\text{o}}}}}\), bo

thermocouple constants (V K−2)


specific heat (J kg−1 K−1)


thermocouple constant (V K−3)


thermal voltage between two junctions with temperatures To and To + θ (V)


slope (K)


heat production per unit length (J s−1 m−1)

r, R

distance (m)


radius (m)

T, To

temperature (K)

t, ts, tf

time (s)


time constant (s)




temperature rise (K)


thermal conductivity (J s−1 m−1 K−1)


density (Kg m−3)


volumetric heat capacity (J m−3 K−1)


moisture content in percent of dry weight


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Copyright information

© Purdue Research Foundation 1983

Authors and Affiliations

  • I. A. van Haneghem
    • 1
  • H. P. A. Boshoven
    • 1
  1. 1.Department of Physics and Meteorology AgriculturalUniversity of WageningenThe Netherlands

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