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Exploration of alternative models for the aging of fouling deposits
Author(s) -
Ishiyama Edward M.,
Paterson William R.,
Ian Wilson D.
Publication year - 2011
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.12514
Subject(s) - fouling , deposition (geology) , heat transfer , turbulence , constant (computer programming) , mechanics , thermal , flux (metallurgy) , flow (mathematics) , heat flux , thermodynamics , chemistry , materials science , metallurgy , geology , computer science , physics , paleontology , biochemistry , membrane , sediment , programming language
The effect of fouling in heat‐transfer devices (HTDs) is complicated by aging of the fouling deposits. Aging is, like deposition, often sensitive to temperature, so that heat transfer, deposition, and aging are coupled phenomena. Ishiyama et al. ( AIChE J . 2010;56:531–545) presented a distributed model of the aging of deposits formed by chemical reaction fouling and illustrated its effect on thermal and hydraulic performance of a HTD operating in the turbulent flow regime. Two‐layer models, simpler than the distributed model, are explored. The deposit is considered to consist of two layers, fresh and aged; this simple picture is shown to be sufficient to interpret thermal and hydraulic aspects of deposit aging when HTDs are operated at constant heat flux (as reflecting laboratory experiments) but not in cases where the constant wall temperature approximation is more realistic. © 2011 American Institute of Chemical Engineers AIChE J, 2011