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Computational analysis of surface‐tension‐driven coating‐defect flow
Author(s) -
Blunk Richard H. J.,
Wilkes James O.
Publication year - 2001
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.690470404
Subject(s) - surface tension , marangoni effect , coating , code (set theory) , flow (mathematics) , lubrication , materials science , tension (geology) , mechanics , computer science , composite material , physics , thermodynamics , programming language , set (abstract data type) , ultimate tensile strength
Abstract Bondline readout (BLRO) is a coating defect frequently exhibited on adhesively‐bonded, polymeric automotive body panels painted with high‐glamor/flow clearcoats. BLRO or telegraphing results from Marangoni‐type, surface‐tension‐driven flows. An efficient numerical code was developed to predict temperature‐ and concentration‐induced BLRO flows to use it as an effective tool for screening and developing potential clearcoat systems. Two numerical codes were developed: a 1‐D code based on the lubrication approximation; a 2‐D code based on the SIMPLER (Semiimplicit method for pressure‐linked equations revised) algorithm. The 1‐D code produced BLRO profiles in agreement with those predicted from the 2‐D code and those measured from BLRO flow experiments, thus confirming a proposed BLRO mechanism. Moreover, the 1‐D code was vastly more time‐efficient than the 2‐D code due to a severe time‐step stability limitation found with the latter.