Derivation of Nonlinear Equations for Surface of Fluid Adhering to a Moving Plate Withdrawn From Liquid Pool

Abstract

The processes of the magnetic tape producing, wire adhering, as well as many other important technological processes, include preparing some special materials’ adhering to a product surface. For a surface withdrawn from the molten metal or the other liquid material there is a problem to determine a profile of a film surface. In this paper, the mathematical model developed for simulation of the adhering process of viscous liquid film to a slowly moving plate, which is vertically withdrawn from the molten metal or the other fluid capacity. The Navier-Stokes equations for a film flow on a surface of the withdrawn plate are considered with the corresponding boundary conditions, and the polynomial approximation is used for the film flow profile. The equations, after integration across the layer of a film flow, result in the system of partial differential equations for the wavy surface ζ(t,x) of a film flow, of flow rate q(t,x) and of flow energy Q(t,x).The derived equations are used for analysis of the nonlinear film flow that determines the quality of a fluid adhering on a surface of the withdrawn plate.