Measurement of Thermal Diffusivity at Continuous Heating Rate: Periodic heating method

Takatoshi Miura, Jun Fukai, Shigemori Ohtani

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Abstract

In this paper, a new modified periodic heating method in which periodical heating of the specimen is overlaid with continuous heating is proposed. It permits easy measurement of the temperature dependence of thermal diffusivity. Measurements are made for polytetrafluoroethylene and a packed bed of aluminum oxide at a heating rate of 0~0.05 K/s from 380 K to 800 K. The observed value for polytetrafluoroethylene is 0.88 × 10-7 m2/s at 380 K and 0.65 × 10-7 m2/s at 550 K. The effective thermal diffusivity of the packed bed of aluminum oxide (apparent density, 8.5 x 102 kg/m3) is approximately 2,05×l0-7m2/s between 500 K and 800 K. These results are independent of heating rate, period of heating and radius of specimen.

Original languageEnglish
Pages (from-to)129-134
Number of pages6
Journalkagaku kogaku ronbunshu
Volume9
Issue number2
DOIs
Publication statusPublished - Jan 1983
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)

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