Premium
Drying‐induced surface roughening of polymeric coating under periodic air blowing
Author(s) -
Yamamura Masato,
Uchinomiya Tetsuro,
Mawatari Yoshihide,
Kage Hiroyuki
Publication year - 2009
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.11783
Subject(s) - biot number , materials science , surface roughness , mechanics , surface (topology) , coating , surface finish , diffusion , relaxation (psychology) , stress (linguistics) , mass transfer , composite material , thermodynamics , geometry , physics , mathematics , psychology , social psychology , linguistics , philosophy
We carried out numerical simulations of drying‐induced surface roughening of a moving liquid layer under periodic air blowing conditions. Using spatially non‐uniform Biot number profiles along the coating surface, the solutions of coupled diffusion/heat transfer equations reveal a periodic growth and relaxation in concentration gradients in the vicinity of the liquid–gas interface. The resultant interfacial stress variations promote particular asymmetric surface topographies that grow and level in a sequential manner. The unique surface roughness is identified by considering time scales required for the web motion, the stress‐induced surface evolution, and the pressure‐driven leveling. Predicted drying maps represent the surface roughening behavior as regions in parameter space. © 2009 American Institute of Chemical Engineers AIChE J, 2009