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An apparatus for measuring the thermal conductivity and diffusivity of solid materials

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Abstract

An apparatus is described for measuring the thermal conductivity and diffusivity on small specimens of solid materials; also the results are shown which have been obtained for refractive high-alumina concrete by such measurements.

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Abbreviations

λ:

thermal conductivity at the mean temperature of specimens, W/m· °C

Q:

power of the central heater, W

F:

cross section area of a specimen, m2

Δt1,2 :

temperature drop across the specimens, °C

δ 1,δ 2 :

difference in heights between the thermocouple beads, center-to-center, in the first and in the second specimen respectively, m

t:

temperature, °C

τ :

time coordinate, min

d1= (d1u+d1l )/2:

mean distance between specimen contact plane and nearest thermocouple beads, for the upper and lower specimen, m

d2= (d2u+d2l )/2:

mean distance between specimen contact plane and farthest thermocouple beads, for the upper and lower specimen, m

dt(d1,τ)/dτ :

rate of temperature rise at section d1 of the specimen at timeτ, °C/h

∑Δt=Δt1+Δt2 :

sum of temperature drops in the specimens at timeτ, °C

m:

heating rate, h−1

a :

thermal diffusivity of specimens, referred to their mean temperature, m2/h

μ=√m/a, m−1 b=¦(Δtu−Δtl)/Δtu¦:

heating nonuniformity factor

Literature cited

  1. M. Klempin, Tonindustr. Ztg. u. Keram. Rundschau [German],78, No. 5 (1954).

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  3. E. S. Platunov, Izv. VUZov Priborostroenie,4, No. 1 (1961).

  4. V. Ya. Chekhovskoi, A. I. Romanov, A. A. Kaulenas, and G. I. Stavrovskii, Teplofiz. Vys. Temp.,5, No. 5 (1967).

  5. V. Ya. Chekhovskoi, Teplofiz. Vys. Temp.,2, No. 2 (1964).

  6. Thermodynamic Properties of Inorganic Materials, Handbook [in Russian], Atomizdat (1965).

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Authors
  1. V. Ya. Chekhovskoi
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  2. R. A. Belyaev
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  3. Yu. V. Vavilov
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Additional information

Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 22, No. 6, pp. 1049–1054, June, 1972.

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Chekhovskoi, V.Y., Belyaev, R.A. & Vavilov, Y.V. An apparatus for measuring the thermal conductivity and diffusivity of solid materials. Journal of Engineering Physics 22, 728–731 (1972). https://doi.org/10.1007/BF00822980

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  • DOI: https://doi.org/10.1007/BF00822980

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