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Measurement of the effective thermal conductivity of agricultural products

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Abstract

This paper reports new measurements of the effective thermal conductivity of agricultural materials such as grains by means of the transient heat flow method using a line heat source. The effect of a probe diameter used for the transient heat flow method on the effective thermal conductivity was studied using standard spherical particles and some grains. It was concluded that the transient heat flow method can be applied to the measurement of the effective thermal conductivity of agricultural materials such as grains provided that the ratio of the probe diameter to the diameter of the particles of the specimen is greater than unity.

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Abbreviations

A :

Area of heating surface

d :

Diameter of particles of the specimen

d e :

Hydrodynamic diameter of particles of the specimen

E :

Error

H :

Distance between hot and cold walls

L :

Probe length

M :

Moisture content

N :

Number of contact points of particles of the speciment to the probe surface

Q :

Net heat flux

q :

Heat flux per probe length added to probe

R :

Probe radius

r :

Radial distance

T :

Temperature

T h :

Surface temperature of the hot wall

T c :

Surface temperature of the cold wall

t :

Time

λ a :

Thermal conductivity of air

λ eff :

Effective thermal conductivity

λ s :

Thermal conductivity of a single kernel

α :

Thermal diffusivity

α s :

Thermal diffusivity of a single kernel

ε :

Porosity

δ :

Euler constant (=0.5775...)

θ :

Angle

References

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kitami Institute of Technology, Koen-Cho 165, Kitami, 090, Hokkaido, Japan

    H. Inaba

Authors
  1. H. Inaba
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Inaba, H. Measurement of the effective thermal conductivity of agricultural products. Int J Thermophys 7, 773–787 (1986). https://doi.org/10.1007/BF00503835

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  • DOI: https://doi.org/10.1007/BF00503835

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