Nonuniform Thinning of Polymeric Coatings under Marangoni Stress

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Hiroyuki Kage¹  Yoshihide Mawatari¹  Masato Yamamura¹  Shiro Wajima¹ 

[1] Department of Applied Chemistry, Kyushu Institute of Technology

关键词: Coating;    Drying;    Marangoni Flow;    Film Shrinkage;    Modeling;   

DOI  :  10.1252/jcej.09we003

来源: Maruzen Company Ltd

【 摘 要 】

References(13)Cited-By(1)We investigate the surface deformation of polymeric coatings dried under interfacial stresses. The surface-tension-driven Marangoni stress drives the liquid from low-surface-tension regimes to high-surface-tension regimes. The results of our computations reveal that with an increase in the Biot number, three distinct deformation modes are formed: (i) one elevation and two depressions, (ii) flat interface, and (iii) one depression near the air impingement point. A new drying map is presented to show the manner in which the nonuniform thickness varies with the Biot and Marangoni numbers. The map helps us decide the optimum operating conditions for achieving uniform surface coatings.

【 授权许可】

Unknown