Study of the Flow of Non-Newtonian Fluids in the Inside of Slot Die

Abstract

One-dimensional flow model for non-Newtonian fluids in the inside of a slot die is presented. The viscosity of non-Newtonian liquids is given by the Ellis model. The conservation equations of mass and momentum in the slot die are treated one-dimensionally by assuming an appropriate mean flow over the cross section of the flow. The flow field in the slot is assumed to be fully developed. The equations of flows for the cavity and the slot are derived separately and then coupled. We use a finite difference method to solve these governing equations. It is concluded that a flow model using the Ellis model for liquid viscosity is useful to predict the distribution of flow rate from the die.