Study of the Flow in a Dual Cavity Slot Die.

Abstract

One-dimensional flow model for non-Newtonian fluids in a dual cavity slot die is presented. The viscosity of non-Newtonian fluids is treated as the Ellis model. The conservation equations of mass and momentum in a dual-cavity slot die are one-dimensionally simplified 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 flow for the cavity and the slot are derived separately and then coupled. We use a finite difference method to solve these governing equations. Using this model, we find that the location and the cross-section area of a secondary cavity have large effects on the distribution of outlet flow. It is concluded that the dual cavity die can effectively reduce the flow non-uniformity.

Experimental and numerical study on flow characteristics of dual‐cavity die based on multi‐objective optimization

“…Its most significant advantage is that it can improve flow phenomena and production problems by quantitatively analyzing flow field characteristics. Compared to the analytical methods of one-dimensional lubrication approximation theory, [6][7][8][9][10] numerical methods avoid errors caused by too many assumptions. Hence, the dies designed by numerical methods are more effective.…”