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Indirect conduction in gas–solids systems: Static vs. Dynamic effects
Author(s) -
Lattanzi Aaron M.,
Hrenya Christine M.
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15802
Subject(s) - thermal conduction , heat transfer , mechanics , surface finish , particle (ecology) , surface roughness , thermodynamics , chemistry , materials science , physics , composite material , oceanography , geology
Conductive mechanisms play an integral role in the transfer of heat through dense gas–solid systems. In particular, the conduction occurring through a thin layer of fluid between the solids (indirect) can become the primary mode for heat transfer within gas–solid systems. However, attempts to evaluate the effect of surface roughness and fluid lens thickness (theoretical inputs) on indirect conduction have been restricted to static, single‐particle cases. By contrast, here we quantify these effects for dynamic, multi‐particle systems using a non‐dimensional, average heat transfer coefficient that is obtained via techniques commonly employed by classic kinetic theory. Analytical predictions for the impact of theoretical inputs on indirect conduction are compared to outputs from computational fluid dynamics–discrete element method simulations. The analytical predictions are in agreement with simulations and show that indirect conduction in static systems is most sensitive to surface roughness, while dynamic systems are sensitive to the fluid lens thickness. © 2017 American Institute of Chemical Engineers AIChE J , 63: 4685–4693, 2017