Study on The Rotational Steady-state Dynamics of Viscous Thin Film Fluids

Abstract

The study of viscous thin film fluid rotation can be applied to a variety of fields, including rotational coating, rotational casting, rotational molding, and the paper industry. In this paper, the parameters affecting the viscous thin film fluid on a rotating rod and the trend of these parameters on the fluid motion and steady state are investigated. The analytical solution of the tangential velocity Uh at steady state of the thin film fluid is solved based on the Nusselt tilted plate thin film fluid model, and the conditions for the fluid attached to the rotating rod to maintain steady state are obtained. The steady state of the fluid at different rotational speeds is simulated using COMSOL and compared with experiments to verify the accuracy of the theoretical model. Then the effects of rotating rod speed, rotating rod diameter and rotating rod friction factor on the steady state, time and attachment of the thin film fluid were investigated experimentally, and the influence trends of each parameter were summarized by three-sample interpolation.