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Accuracy of Thermocouples in Transient Surface Temperature Measurements Dominated by Radiant Heating

[+] Author Affiliations
K. S. Jhajj, E. F. J. R. Caron, N. L. Chester, K. J. Daun

University of Waterloo, Waterloo, ON, Canada

Paper No. IMECE2014-38243, pp. V08BT10A036; 9 pages
doi:10.1115/IMECE2014-38243
From:
  • ASME 2014 International Mechanical Engineering Congress and Exposition
  • Volume 8B: Heat Transfer and Thermal Engineering
  • Montreal, Quebec, Canada, November 14–20, 2014
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4956-9
  • Copyright © 2014 by ASME

abstract

In hot forming die quenching, furnaces are used to austenitize steel blanks and transform an Al-Si layer into a permanent Al-Si-Fe coating. Application of a simplified heat transfer model to thermocouple measurements on steel blanks heated in industrial furnaces showed specific heats that varied with blank thicknesses, raising questions about the accuracy of these measurements. A detailed experimental study on a lab scale muffle furnace shows that natural convection and variations in the surrounding temperatures has a strong influence on the inferred specific heat. An improved heat transfer model is used to qualitatively assess how austenitization influences the effective specific heat.

Copyright © 2014 by ASME

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