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Wetting of fiber mats for composites manufacturing: II. Air entrapment model
Author(s) -
Chen YungTin,
Macosko Christopher W.,
Davis H. Ted
Publication year - 1995
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.690411010
Subject(s) - wetting , entrapment , composite material , void (composites) , porosity , materials science , capillary action , fiber , mechanics , surgery , medicine , physics
In this work the experimental observations are explained with the aid of a simple air‐entrapment model based on the concept of two levels of porosity of fiber mats. A simple model that includes liquid bypassing with initial air trapping, subsequent capillary invasion of regular fiber bundles with air compression, and finally mobilization is proposed to explain air‐entrapment phenomena. The simple model successfully rationalizes the observed air trapping and compression during initial liquid–fiber contact. An empirical equation for the mobilization efficiency is adapted to the model to estimate void content. The velocity dependence of the trapped void content predicted by the model is in good agreement with observations.