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Heat transfer to a moving packed bed of nickel pellets
Author(s) -
Baird M. H. I.,
Rama Rao N. V.,
Tackie E.,
Vahed A.
Publication year - 2008
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.20023
Subject(s) - pellets , pellet , materials science , heat transfer , packed bed , nickel , mechanics , heat transfer coefficient , mass transfer , thermal conductivity , composite material , thermodynamics , chemistry , metallurgy , chromatography , physics
Heat transfer between a bed of nickel pellets and a vertical section of electrically heated steel pipe has been measured, with the pellet bed inside the vertical pipe. Most of the data are for a 20.27 cm diameter pipe but some data were also obtained for a 10.23 cm diameter pipe. The effective thermal conductivity of the stationary pellet bed has been estimated approximately from the results of unsteady heating tests. Tests have been carried out with a downwardly moving bed, including the effect of air flowing upwards through the bed. Average values of the pellet‐side heat transfer coefficient are between 72 and 135 W/(m 2 °C) depending on the mass fluxes of air and pellets, and have been expressed as an empirical correlation.