Inertia effects on the dip-coating of fibers. Numerical analysis

D.M. CAMPANA; S UBAL; M.D. GIAVEDONI; F.A. SAITA

Buenos Aires

Congreso; XII Reunión sobre Recientes Avances en Física de Fluídos y sus Aplicaciones (Fluidos 2012); 2012

División Fluidos y Plasmas de AFA

Dip coating is the process by which a thin layer of liquid is deposite on a given susbtrate, as it is withdrawn from a pool of coating liquid. The two geometrical configurations more studied are the plane and cylindrical substrates, the latter being the subject of this work. White and Tallmadge (1966) presented an adaptation of the Landau and Levich analysis(1942) to the cylindrical configuration wher the film thickness predited are valid for the so-called visco-capillary regime. However when inertia become important, the deposited film becomes thicker than the one predicted by White and Tallmadge, as observed experimentalyy by De Ryck and Quere (1996) and Rebouillat et al. (2002). In this work we study numerically this process for the visco-inertial regime and compare our predictions with the experiments carried out by De Ryck and Quere and Rebouillat et al. The agreement between theory and experiments turns out to be excellent.