666d Prediction of Conditions Under Which Flow Instabilities Are Onset to Give Rise to Extrudate Distortions during the Extrusion of Highly Filled Energetic Suspensions

Suzanne Prickett¹, Hansong Tang², Halil Gevgilili³, and Dilhan Kalyon³. (1) Code 910 M, Naval Surface Warfare Center, Indian Head Division, Indian Head, MD 20640-5035, (2) Civil Engineering, City University of New York, New York, NY 10021, (3) Stevens Institute of Technology, Castle Point St., Hoboken, NJ 07030

Extrudate distortions upon exit from the die in batch or continuous processing are commonly encountered and very difficult to correct on a trial and error basis. Here a time dependent source code is introduced which allows the conditions under which flow instabilities are onset in extrusion processes. Comparisons of theory versus experiments will be presented for various well-defined suspensions.