Uniqueness of film thickness and meniscus profiles in vertical withdrawal

✍ Scribed by R.P. Spiers; W.L. Wilkinson

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 398 KB
• Volume: 29
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(74)87042-9

✦ Synopsis

The authors' new one-dimensional free coating theory is considered further, and compared with previous theories. It is shown that a unique value of the dimensionless film thickness, TO, exists over a wide range of Capillary Number, Ca. The shape of the upper meniscus is predicted from the new one-dimensional theory and compared with previous one-and two-dimensional creeping flow solutions. The superiority of the new one-dimensional theory over the previous theory is demonstrated, and the shape of the upper meniscus is shown to provide a more sensitive test of withdrawal theories. Comparison is also made with recently presented data.