Air entrainment on a moving continuous web

An atomic layer deposition process for moving flexible substrates

“…As a result we can expect precursor intermixing, a chemical reaction and excess growth. This hypothesis has been illustrated using the relation between substrate speed and boundary layer thickness,ı, [18] …”

“…An important factor could be gas entrainment by the moving substrate. It has been reported that the relative movement between a surface and a gas gives rise to a near-surface boundary layer with thickness inversely proportional to the square root of the relative velocity [18].…”

Interaction of an axially moving band and surrounding fluid by boundary layer theory

“…Indeed, his results regarding boundary layer behaviour on moving continuous flat surfaces (Sakiadis, 1961b) do indeed show this to be significantly different from that observed with a moving flat plate of finite length. Arzate and Tanguy (2004), investigating the air boundary layer behaviour at the surface of a moving web with experimental measurements made on the web loop system of a jet coating rig, as shown in a schemantic figure ( Fig. 1(b)), and comparing their measurements with the theoretical values predicted by the Blasius (1908), Rayleigh (1911) and Sakiadis (1961b) solutions, showed the Blasius solution to be more appropriate for this flow configuration, while the Sakiadis (1961b) solution could be better applied to a two roll nip in which the web moves between the rolls, limiting the origin of the boundary layer.…”

“…The boundary layer flow on a moving web can be explained by analogy with the boundary layer on moving continuous flat surfaces as shown by Sakiadis (1961a,b) and Arzate and Tanguy (2004). Sakiadis (1961a,b) presents equations for the thicknesses of both a laminar and a turbulent boundary layer on a moving continuous flat surface.…”

“…Boundary layer behaviour on a moving continuous flat surface: (a)Sakiadis (1961b); (b)Arzate and Tanguy (2004).…”