ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 7

Analysis of Gas-Fired Ceramic Radiant Tubes During Transient Heating: Part I—Thermal Transient Modeling

Segall, AE
Research Engineer, Center for Advanced Materials, The Pennsylvania State University, University Park, PA

Hellmann, JR
Assistant Professor of Ceramic Science and Engineering, Assistant Director, Center for Advanced Materials, The Pennsylvania State University, University Park, PA

Modest, MF
Professor of Mechanical Engineering, The Pennsylvania State University, University Park, PA

(Received 20 September 1990; accepted 15 April 1991)

Abstract

Low profile thermocouples were used to measure the external transient temperature distributions on open-ended silicon carbide radiant tubes during cold-start heating. The measured tube and furnace temperatures were used with radiant exchange relationships for gray-diffuse surfaces and natural convection formulations to calculate quasi-static effective heat transfer coefficients along the length of the tubes. Finite-element analysis was then used with the effective heat transfer coefficients to calculate the transient temperature distribution throughout the tube. Results indicate relatively mild radial temperature distributions during the heating conditions studied and the applicability of the analysis to different tube geometries and burner systems.

Keywords:
ceramic, radiant tube, transient, thermal profile, effective heat transfer coefficient, thermal diffusivity

Paper ID: JTE12608J
DOI: 10.1520/JTE12608J
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