CHARACTERIZATION OF MIXING PROCESSES FOR POLYMERIC ENERGETIC MATERIALS

PDF

Authors
  1. Dubois, C.
  2. Thibault, F.
  3. Tanguy, P.A.
  4. Ait-Kadi, A.
Corporate Authors
Defence Research Establishment Valcartier, Valcartier QUE (CAN)
Abstract
Many modern energetic materials are composite formulations based on a polymeric binder. The processing of such materials involves different types of mixing equipment like vertical and horizontal batch mixers or twin screw extruders. Since the task of homogenizing a multicomponent mixture appears to be simple, the consequences of an inappropriate mixing cycle are often overlooked. Hence, defects like voids, sedimentation or segregated physical properties are likely to be observed. This paper describes how advanced characterization techniques can be used to optimize the selection and the operation of high-viscosity-fluid mixers. Because of the continuing development of new formulations, parameters defining the propellant processing cycle often have to be adjusted to different reaction rates and polymer properties. Given an appropriate chemorheological model, an optimized mixing cycle can be sketched if the mixer operational characteristics are known. Such a characterization was performed in a twin intermeshing conical helical mixer. From torque measurements, the power draw was determined by using Newtonian fluids in laminar flow conditions. Moreover, the existence of segregated zones was investigated with neutrally buoyant particles under different operating conditions. In addition to this experimental study, numerical simulations using the virtual finite element method were carried out. TRUNCATED
Keywords
Power consumption;Computational Fluid Dynamics (CFD)
Date of publication
06 Feb 1997
Number of Pages
14
DSTKIM No
97-01782
CANDIS No
502021
Format(s):
Hardcopy;Document Image stored on Optical Disk

Permanent link

Document 1 of 1

Date modified: