Paper Number
SC14
Session
Suspensions, Colloids, and Granular Materials
Title
Elucidating powder rheology via Discrete Element simulations and mechanically stirred powder rheometry
Presentation Date and Time
October 21, 2019 (Monday) 5:25
Track / Room
Track 2 / Room 304
Authors
- Lechman, Jeremy B. (Sandia National Laboratories)
- Bolintineanu, Dan S. (Sandia National Laboratories)
- Grillet, Anne M. (Sandia National Laboratories, Engineering Sciences Division)
Author and Affiliation Lines
Jeremy B. Lechman, Dan S. Bolintineanu, and Anne M. Grillet
Engineering Sciences Division, Sandia National Laboratories, Albuquerque, NM 87185-0346
Speaker / Presenter
Lechman, Jeremy B.
Text of Abstract
Bulk solids composed of many discrete particles, i.e., grains and powders, are present in numerous engineering applications from mining to materials processing to energy storage to consumer products to food. In addition, particles are often added to materials to enhance their properties and subsequent performance in some fashion. Although particulate materials are ubiquitous, there remains a general lack of predictive understanding of their behavior; leading to a deficiency in effective, efficient control of the processing of such materials. At the core of this poor understanding is a shaky fundamental explanation of how the dynamics of individual particles, in ensemble, lead to the complicated dilative, yield stress, pressure dependent rheological behaviors of the bulk material. This challenge is particularly acute at low confining stresses for small, mildly cohesive particles. In this paper, we will present work to simulate, via the Discrete Element Method (DEM), the dynamics of individual particles of metal powders in a mechanically stirred powder rheometer. Our aim is to elucidate the connection between particle dynamics and powder rheology. In addition, we will assess the use of powder rheometry as a means of validating DEM models. Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia LLC, a wholly owned subsidiary of Honeywell International Inc. for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA0003525.